Audio combiner question - new mobile radio
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Edward R Cole
Aug 3, 2016, 12:55:22 PM8/3/16
to pnw...@googlegroups.com
Recently mentioned new "rover" (F250 truck) is getting a new radio.
I bought the new Alinco DR735T and will install it with separation
kit so control panel will be attached to lower area of dash and radio
in locked compartment under back seat. I also bought an 8-ohm mobile
speaker since the radio speaker is located in the body of the radio.
But this is a dual-band radio and has two external speaker jacks and
I only have room for one speaker, up front. So wonder if anyone has
combined two speaker outputs to drive a common speaker. Google
suggests the simplest method is using isolation resistors in a wye
configured cable. I have a dual 10K pot which can be used to
determine the best resistance to use with trade-off between isolation
and attenuation of the audio.
I know I could just run two speaker cables to a switch but that would
preclude monitoring two frequencies simultaneously which this radio
does, nicely.
I am also looking for a inexpensive TNC for running APRS (no texting
while driving). Looking at TinyTrak4 ($65.00) and Argent Tracker3
($95.00) (they have a mini-board that embeds in the DR135 so wonder
if I can incorporate it into my DR735? question for Argent. I have
an old Garmin GPS that can be located on the back window for short
connection to TNC.
Also looking at Garmin GPS Mappers and wondering if a Trucker model
would be better as they identify low clearance overpasses (for
traveling with our new 5th wheel trailer).
Sorry lots of questions. <BTW getting 21.5 mpg after filling tank and
resetting mileage meter>
73, Ed - KL7UW
http://www.kl7uw.com
"Kits made by KL7UW"
Dubus Mag business:
dubu...@gmail.com
I bought the new Alinco DR735T and will install it with separation
kit so control panel will be attached to lower area of dash and radio
in locked compartment under back seat. I also bought an 8-ohm mobile
speaker since the radio speaker is located in the body of the radio.
But this is a dual-band radio and has two external speaker jacks and
I only have room for one speaker, up front. So wonder if anyone has
combined two speaker outputs to drive a common speaker. Google
suggests the simplest method is using isolation resistors in a wye
configured cable. I have a dual 10K pot which can be used to
determine the best resistance to use with trade-off between isolation
and attenuation of the audio.
I know I could just run two speaker cables to a switch but that would
preclude monitoring two frequencies simultaneously which this radio
does, nicely.
I am also looking for a inexpensive TNC for running APRS (no texting
while driving). Looking at TinyTrak4 ($65.00) and Argent Tracker3
($95.00) (they have a mini-board that embeds in the DR135 so wonder
if I can incorporate it into my DR735? question for Argent. I have
an old Garmin GPS that can be located on the back window for short
connection to TNC.
Also looking at Garmin GPS Mappers and wondering if a Trucker model
would be better as they identify low clearance overpasses (for
traveling with our new 5th wheel trailer).
Sorry lots of questions. <BTW getting 21.5 mpg after filling tank and
resetting mileage meter>
73, Ed - KL7UW
http://www.kl7uw.com
"Kits made by KL7UW"
Dubus Mag business:
dubu...@gmail.com
K7RSG
Aug 3, 2016, 1:08:07 PM8/3/16
to PNWVHFS
This may work... story first
Many years ago Motorola made marine radios. One version had two independent receivers that drove a special two coil speaker. This allowed commercial vessels to listen to channel 16 and 13 at the same time with one radio, and never stop listening on 13, even while on a working channel with the other receiver.
I think this speaker is the same deal http://www.jegs.com/InstallationInstructions/700/700/700-SpeakerManual.pdf
Build an enclosure and run both speaker lines to it.... I think.
Good luck DE K7RSG
Jim Allyn
Aug 3, 2016, 1:16:40 PM8/3/16
to pnw...@googlegroups.com
I have used resistive splitters/combiners both for RF and for
audio. Just use a Y configuration, with each resistor being Zo/3 ohms,
in this case 8/3 = 2.67 ohms. Be sure to use resistors big enough to
absorb the power involved in this process; a couple of watts should
suffice, but I would probably use 5 watt resistors just because they are
readily available and should give plenty of margin in power
dissipation. Having owned an electronics repair shop, I can tell you
that you don't want to just connect the two outputs in parallel. People
used to bring equipment to the shop for repair after they had paralleled
the TV and the stereo outputs to drive the stereo speakers. Usually
that will destroy the output transistors of one or both of the devices.
Happy roving!
Jim, N7JA
audio. Just use a Y configuration, with each resistor being Zo/3 ohms,
in this case 8/3 = 2.67 ohms. Be sure to use resistors big enough to
absorb the power involved in this process; a couple of watts should
suffice, but I would probably use 5 watt resistors just because they are
readily available and should give plenty of margin in power
dissipation. Having owned an electronics repair shop, I can tell you
that you don't want to just connect the two outputs in parallel. People
used to bring equipment to the shop for repair after they had paralleled
the TV and the stereo outputs to drive the stereo speakers. Usually
that will destroy the output transistors of one or both of the devices.
Happy roving!
Jim, N7JA
Edward R Cole
Aug 3, 2016, 1:33:23 PM8/3/16
to gpd...@gmail.com, PNWVHFS
Thanks.
But I have a speaker on the way so looking at the audio mixing issue. Obviously both audio amplifier outputs need to be isolated from each other and still see a reasonable load impedance. I could build a mixing amp but would prefer KISS.
The space I have for the speaker is a tiny 3-4 inch space on the floor at base of the dash panel. There is not enough space on truck cab side panels at foot level, which is one of the traditional locations for ext speakers. I am also being very careful where I am drilling holes.
The lockable storage under the back seat is kind of a plus. It even has a dc outlet but I do not know at what current rating. If not adequate for the 50w radio (15.3 A) then I will run heavy dc wiring from the left side battery (truck has two). I will have to drill a hole for antenna cable access so adding a power cable is no bigee.
I'm thinking of a base plate to attach the radio equipment for ease of removal and no holes drilled in truck. The enclosure will need some holes for air interchange. Eventually my Elecraft KXPA100 HF/6m amp will also be installed in the same enclosure. It will have coax for HF or 6m antenna. KX3 will be mounted up front.
73, Ed
But I have a speaker on the way so looking at the audio mixing issue. Obviously both audio amplifier outputs need to be isolated from each other and still see a reasonable load impedance. I could build a mixing amp but would prefer KISS.
The space I have for the speaker is a tiny 3-4 inch space on the floor at base of the dash panel. There is not enough space on truck cab side panels at foot level, which is one of the traditional locations for ext speakers. I am also being very careful where I am drilling holes.
The lockable storage under the back seat is kind of a plus. It even has a dc outlet but I do not know at what current rating. If not adequate for the 50w radio (15.3 A) then I will run heavy dc wiring from the left side battery (truck has two). I will have to drill a hole for antenna cable access so adding a power cable is no bigee.
I'm thinking of a base plate to attach the radio equipment for ease of removal and no holes drilled in truck. The enclosure will need some holes for air interchange. Eventually my Elecraft KXPA100 HF/6m amp will also be installed in the same enclosure. It will have coax for HF or 6m antenna. KX3 will be mounted up front.
73, Ed
At 09:08 AM 8/3/2016, K7RSG wrote:
This may work... story first
Many years ago Motorola made marine radios. One version had two independent receivers that drove a special two coil speaker. This allowed commercial vessels to listen to channel 16 and 13 at the same time with one radio, and never stop listening on 13, even while on a working channel with the other receiver.
Â
I think this speaker is the same deal http://www.jegs.com/InstallationInstructions/700/700/700-SpeakerManual.pdf
Â
Build an enclosure and run both speaker lines to it.... I think.
Â
Good luck DE K7RSG
On Wednesday, August 3, 2016 at 9:55:22 AM UTC-7, Edward R Cole wrote:
- Recently mentioned new "rover" (F250 truck) is getting a new radio.
- I bought the new Alinco DR735T and will install it with separation
- kit so control panel will be attached to lower area of dash and radio
- in locked compartment under back seat. Â I also bought an 8-ohm mobile
- speaker since the radio speaker is located in the body of the radio.
- But this is a dual-band radio and has two external speaker jacks and
- I only have room for one speaker, up front. Â So wonder if anyone has
- combined two speaker outputs to drive a common speaker. Â Google
- suggests the simplest method is using isolation resistors in a wye
- configured cable. Â I have a dual 10K pot which can be used to
- determine the best resistance to use with trade-off between isolation
- and attenuation of the audio.
- I know I could just run two speaker cables to a switch but that would
- preclude monitoring two frequencies simultaneously which this radio
- does, nicely.
- I am also looking for a inexpensive TNC for running APRS (no texting
- while driving). Â Looking at TinyTrak4 ($65.00) and Argent Tracker3
- ($95.00) (they have a mini-board that embeds in the DR135 so wonder
- if I can incorporate it into my DR735? Â question for Argent. Â I have
- an old Garmin GPS that can be located on the back window for short
- connection to TNC.
- Also looking at Garmin GPS Mappers and wondering if a Trucker model
- would be better as they identify low clearance overpasses (for
- traveling with our new 5th wheel trailer).
- Sorry lots of questions. <BTW getting 21.5 mpg after filling tank and
--
- resetting mileage meter>
- 73, Ed - KL7UW
- http://www.kl7uw.com
- Â Â Â "Kits made by KL7UW"
- Dubus Mag business:
- Â Â Â dubu...@gmail.com
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K7RSG
Aug 3, 2016, 1:35:10 PM8/3/16
to PNWVHFS
Sorry to reply twice, but this question caused me to be overcome with nostalgia for old radios.
The Motorola Modar marine radio was the basis for the only official ham radio Motorola ever made, the Metrum.
Single receiver Modar 55/75 here. http://mmncny.org/wp-content/uploads/2012/04/IM001295_800.jpg
Here is a picture of a Metrum manual http://www.radio-mart.net/images/P/IMG_9864.jpg
I had Metrum, but gave it away... like an idiot.
I can't find a picture of the dual receiver Modar.... When I worked at Rogers Marine, back in the dark ages, we sold a lot of these, now they're all gone.
73 DE K7RSG
On Wednesday, August 3, 2016 at 9:55:22 AM UTC-7, Edward R Cole wrote:
Steve Toth
Aug 3, 2016, 2:28:58 PM8/3/16
to kl...@acsalaska.net, pnw...@googlegroups.com
Check out car audio and speaker sites and look for dual coil speakers. Some classic car/muscle car owners who do not want to cut up their dash or install non-stock kick panels mount these in place of the original dash speaker to get both left and right stereo channels out of one speaker.
Also a google search on "dual coil speaker" would probably bring up some leads.
- Steve W7SJT
"Always look for a positive solution then Improvise, Adapt, and Overcome"
"Sometimes it is the people who no one imagines doing anything, who do the things that no one can imagine".....
From: Edward R Cole <kl...@acsalaska.net>
To: pnw...@googlegroups.com
Sent: Wednesday, August 3, 2016 9:55 AM
Subject: [PNWVHFS] Audio combiner question - new mobile radio
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Edward R Cole
Aug 3, 2016, 2:50:05 PM8/3/16
to gpd...@gmail.com, PNWVHFS
I once bought a MOT CB radio (SSB capable) thinking it would be top
quality. This was mid-70's when CB radio was riding on a wave of
popularity for the trucking crowd (I bought if for emergency comm for
driving cross-country). I had been a ham for twenty years so never
was anything but "back up" comms.
The MOT did not turn out to be especially good (rather hum drum) and I stopped using it within a couple years of arriving in AK. Whereas 2m ham radio became quite useful and important comms (using the Anchorage repeater auto-patch since I was off the grid with no phone).
I will say I moved my last employer's 2-way radio inventory to nearly 100% MOT. There they really have top-notch rep.
I worked one summer for a marine radio/radar shop and my last job included comms on seven boats, so seen a bunch of marine electronics thru the years. Icom M125 was very present as was Sailor brand. Don't recall seeing a Modar or Metum.
73, Ed
The MOT did not turn out to be especially good (rather hum drum) and I stopped using it within a couple years of arriving in AK. Whereas 2m ham radio became quite useful and important comms (using the Anchorage repeater auto-patch since I was off the grid with no phone).
I will say I moved my last employer's 2-way radio inventory to nearly 100% MOT. There they really have top-notch rep.
I worked one summer for a marine radio/radar shop and my last job included comms on seven boats, so seen a bunch of marine electronics thru the years. Icom M125 was very present as was Sailor brand. Don't recall seeing a Modar or Metum.
73, Ed
At 09:35 AM 8/3/2016, K7RSG wrote:
Sorry to reply twice, but this question caused me to be overcome with nostalgia for old radios.
The Motorola Modar marine radio was the basis for the only official ham radio Motorola ever made, the Metrum.
Single receiver Modar 55/75 here. http://mmncny.org/wp-content/uploads/2012/04/IM001295_800.jpg
Here is a picture of a Metrum manual http://www.radio-mart.net/images/P/IMG_9864.jpg
I had Metrum, but gave it away... like an idiot.
I can't find a picture of the dual receiver Modar.... When I worked at Rogers Marine, back in the dark ages, we sold a lot of these, now they're all gone.
73 DE K7RSG
On Wednesday, August 3, 2016 at 9:55:22 AM UTC-7, Edward R Cole wrote:
- Recently mentioned new "rover" (F250 truck) is getting a new radio.
- I bought the new Alinco DR735T and will install it with separation
- kit so control panel will be attached to lower area of dash and radio
- in locked compartment under back seat. Â I also bought an 8-ohm mobile
- speaker since the radio speaker is located in the body of the radio.
- But this is a dual-band radio and has two external speaker jacks and
- I only have room for one speaker, up front. Â So wonder if anyone has
- combined two speaker outputs to drive a common speaker. Â Google
- suggests the simplest method is using isolation resistors in a wye
- configured cable. Â I have a dual 10K pot which can be used to
- determine the best resistance to use with trade-off between isolation
- and attenuation of the audio.
- I know I could just run two speaker cables to a switch but that would
- preclude monitoring two frequencies simultaneously which this radio
- does, nicely.
- I am also looking for a inexpensive TNC for running APRS (no texting
- while driving). Â Looking at TinyTrak4 ($65.00) and Argent Tracker3
- ($95.00) (they have a mini-board that embeds in the DR135 so wonder
- if I can incorporate it into my DR735? Â question for Argent. Â I have
- an old Garmin GPS that can be located on the back window for short
- connection to TNC.
- Also looking at Garmin GPS Mappers and wondering if a Trucker model
- would be better as they identify low clearance overpasses (for
- traveling with our new 5th wheel trailer).
- Sorry lots of questions. <BTW getting 21.5 mpg after filling tank and
- resetting mileage meter>
- 73, Ed - KL7UW
- http://www.kl7uw.com
- Â Â Â "Kits made by KL7UW"
- Dubus Mag business:
- Â Â Â dubu...@gmail.com
--
~The Voice of the Pacific NorthWest VHF Society~
You are subscribed to the Google Groups "PNWVHFS" group.
To post to this group, send email to PNW...@googlegroups.com
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73, Ed - KL7UW
Edward R Cole
Aug 3, 2016, 2:52:54 PM8/3/16
to pnw...@googlegroups.com
>Date: Wed, 03 Aug 2016 10:37:44 -0800
>To: "CWO4 Michael A. Sterba USNR" <ars....@gmail.com>
>From: Edward R Cole <kl...@acsalaska.net>
>Subject: Re: [PNWVHFS] Audio combiner question - new mobile radio
>
>I appreciate all the input and suggestions but Michael has hit on
>the best one, in my mind. I should be able to remove the internal
>speaker to disconnect its wiring and reroute that to one of the
>external speaker jacks (which I will label) to connect to my ext.
>speaker. Alinco specifies 8-ohm so that should match perfectly and
>not risk overloading the audio output accidently.
>
>thanks,
>73, Ed - KL7UW
>
>At 09:42 AM 8/3/2016, CWO4 Michael A. Sterba USNR wrote:
>
>>Ed,
>>
>>
>>
>>The simplest way to do this is to disconnect the internal speaker
>>and tap in an external speaker direct since you won't be using the
>>main radio body to listen to. The radio has the built in audio
>>combiner so why duplicate the effort?
>>
>>Just a thought.
>>
>>
>>
>>
>>
>>Thank you,
>>
>>
>>
>>Michael A. Sterba
>>
>>*****************
>>
>>ARS - KG7HQ
>>
>>Assistant Director / Technical Specialist / VE
>>
>>Northwestern Division, ARRL
>>
>>ars....@gmail.com
>>
>>
>>
>>On Wednesday, August 3, 2016 8:55:13 AM PDT Edward R Cole wrote:
>>
>> > Recently mentioned new "rover" (F250 truck) is getting a new radio.
>>
>> >
>>
>> > I bought the new Alinco DR735T and will install it with separation
>>
>> > kit so control panel will be attached to lower area of dash and radio
>>
>> > in locked compartment under back seat. I also bought an 8-ohm mobile
>>
>>
>>On Wednesday, August 3, 2016 8:55:13 AM PDT Edward R Cole wrote:
>>
>> > Recently mentioned new "rover" (F250 truck) is getting a new radio.
>>
>> >
>>
>> > I bought the new Alinco DR735T and will install it with separation
>>
>> > kit so control panel will be attached to lower area of dash and radio
>>
>>
>> > speaker since the radio speaker is located in the body of the radio.
>>
>> >
>>
>> > But this is a dual-band radio and has two external speaker jacks and
>>
>> > I only have room for one speaker, up front. So wonder if anyone has
>> > speaker since the radio speaker is located in the body of the radio.
>>
>> >
>>
>> > But this is a dual-band radio and has two external speaker jacks and
>>
>>
>> > combined two speaker outputs to drive a common speaker. Google
>>
>> > suggests the simplest method is using isolation resistors in a wye
>>
>> > configured cable. I have a dual 10K pot which can be used to
>> > suggests the simplest method is using isolation resistors in a wye
>>
>>
>> > determine the best resistance to use with trade-off between isolation
>>
>> > and attenuation of the audio.
>>
>> >
>>
>> > I know I could just run two speaker cables to a switch but that would
>>
>> > preclude monitoring two frequencies simultaneously which this radio
>>
>> > does, nicely.
>>
>> >
>>
>> > I am also looking for a inexpensive TNC for running APRS (no texting
>>
>> > while driving). Looking at TinyTrak4 ($65.00) and Argent Tracker3
>> > determine the best resistance to use with trade-off between isolation
>>
>> > and attenuation of the audio.
>>
>> >
>>
>> > I know I could just run two speaker cables to a switch but that would
>>
>> > preclude monitoring two frequencies simultaneously which this radio
>>
>> > does, nicely.
>>
>> >
>>
>> > I am also looking for a inexpensive TNC for running APRS (no texting
>>
>>
>> > ($95.00) (they have a mini-board that embeds in the DR135 so wonder
>>
>> > if I can incorporate it into my DR735? question for Argent. I have
>> > ($95.00) (they have a mini-board that embeds in the DR135 so wonder
>>
>>
>> > an old Garmin GPS that can be located on the back window for short
>>
>> > connection to TNC.
>>
>> >
>>
>> > Also looking at Garmin GPS Mappers and wondering if a Trucker model
>>
>> > would be better as they identify low clearance overpasses (for
>>
>> > traveling with our new 5th wheel trailer).
>>
>> >
>>
>> > Sorry lots of questions. <BTW getting 21.5 mpg after filling tank and
>>
>> > resetting mileage meter>
>>
>> >
>>
>> > 73, Ed - KL7UW
>>
>> > http://www.kl7uw.com
>>
>> > an old Garmin GPS that can be located on the back window for short
>>
>> > connection to TNC.
>>
>> >
>>
>> > Also looking at Garmin GPS Mappers and wondering if a Trucker model
>>
>> > would be better as they identify low clearance overpasses (for
>>
>> > traveling with our new 5th wheel trailer).
>>
>> >
>>
>> > Sorry lots of questions. <BTW getting 21.5 mpg after filling tank and
>>
>> > resetting mileage meter>
>>
>> >
>>
>> > 73, Ed - KL7UW
>>
>> > http://www.kl7uw.com
>>
K7RSG
Aug 3, 2016, 3:42:33 PM8/3/16
to PNWVHFS, gpd...@gmail.com
Yes, you're right, Motorola CB radios were nothing special, but the 12 channel and later the synthesized "55/75" marine radios were better than anything else to sell to a tug boat owner. I don't know what they used on big ships, I did see Harris full duplex marine radios for telephone interconnect, they were pretty cool at the time.
In any case, the Metrum was a fun toy for Motorola geeks. From high school on, my car was always decorated with Motrac, Motran, Mocom, Micor, Syntor, or some other Motorola box... I even had a Micom HF SSB for a while.
I blame K7LJ for corrupting my youth, and several others.... we all turned out to be engineers, if we didn't waste our youth on ham radio, we'd be pointy haired boss by now.
Now I only have foreign built radios in the truck.
73 DE K7RSG
Jeff Moore
Aug 3, 2016, 4:45:15 PM8/3/16
to pnw...@googlegroups.com
You might look in the owners manual and see if the radio has any speaker output options. I have a Kenwood D-710 that also is a dual band radio with 2 speaker outputs. The D-710 gives you several options via menu to control what goes to what speaker outlet. I have never used more than one speaker and I've never seen more than one external speaker used with a mobile radio dual band or not!
Jeff Moore -- KE7ACYEdward R Cole
Aug 3, 2016, 5:28:08 PM8/3/16
to gpd...@gmail.com, PNWVHFS, gpd...@gmail.com
I agree that Motorola makes the best commercial gear (with some
exceptions). In my 2-way career, 1980-2009, I installed a lot and
worked on even more. Also worked on GE/Ericcson stuff both mobile
and fixed.
I have a Spectra 900-MHz for 927.50 FM which I use to drive a MOT 900-MHz amp to 60w. Also have a VHF HT600 that I bought to be a repeater control link radio.
But have gone over to a lot of Elecraft equipment for main station: K3, KX3, KXPA-100. Also have an old FT2400 which is being retired by the new DR735T. I bought a ancient FT736R for my main station to use as FM radio and for satellite comms. It has served well as backup to my K3+DEMI transverters during some maintenance issues.
I had a DR635T back almost 10-15 years ago and liked it enough to try the DR735T.
Yeah, I got my masters in business to become a pointed-haired boss but flamed-out and moved into the woods in Alaska, instead. <laughter> Engineering has always been in my blood and working as lead technician got a lot of use of that training. Now a full-time ham and totally off-the-clock retiree <more laughter>
73, Ed - KL7UW
So next summer check FINDU to see where we are traveling.
I have a Spectra 900-MHz for 927.50 FM which I use to drive a MOT 900-MHz amp to 60w. Also have a VHF HT600 that I bought to be a repeater control link radio.
But have gone over to a lot of Elecraft equipment for main station: K3, KX3, KXPA-100. Also have an old FT2400 which is being retired by the new DR735T. I bought a ancient FT736R for my main station to use as FM radio and for satellite comms. It has served well as backup to my K3+DEMI transverters during some maintenance issues.
I had a DR635T back almost 10-15 years ago and liked it enough to try the DR735T.
Yeah, I got my masters in business to become a pointed-haired boss but flamed-out and moved into the woods in Alaska, instead. <laughter> Engineering has always been in my blood and working as lead technician got a lot of use of that training. Now a full-time ham and totally off-the-clock retiree <more laughter>
73, Ed - KL7UW
So next summer check FINDU to see where we are traveling.
At 11:42 AM 8/3/2016, K7RSG wrote:
Yes, you're right, Motorola CB radios were nothing special, but the 12 channel and later the synthesized "55/75" marine radios were better than anything else to sell to a tug boat owner. I don't know what they used on big ships, I did see Harris full duplex marine radios for telephone interconnect, they were pretty cool at the time.
In any case, the Metrum was a fun toy for Motorola geeks. From high school on, my car was always decorated with Motrac, Motran, Mocom, Micor, Syntor, or some other Motorola box... I even had a Micom HF SSB for a while.
I blame K7LJ for corrupting my youth, and several others.... we all turned out to be engineers, if we didn't waste our youth on ham radio, we'd be pointy haired boss by now.
Now I only have foreign built radios in the truck.Â
73 DE K7RSG
On Wednesday, August 3, 2016 at 11:50:05 AM UTC-7, Edward R Cole wrote:
- I once bought a MOT CB radio (SSB capable) thinking it would be top quality. This was mid-70's when CB radio was riding on a wave of popularity for the trucking crowd (I bought if for emergency comm for driving cross-country). I had been a ham for twenty years so never was anything but "back up" comms.
- The MOT did not turn out to be especially good (rather hum drum) and I stopped using it within a couple years of arriving in AK. Whereas 2m ham radio became quite useful and important comms (using the Anchorage repeater auto-patch since I was off the grid with no phone).
- I will say I moved my last employer's 2-way radio inventory to nearly 100% MOT. There they really have top-notch rep.
- I worked one summer for a marine radio/radar shop and my last job included comms on seven boats, so seen a bunch of marine electronics thru the years. Icom M125 was very present as was Sailor brand. Don't recall seeing a Modar or Metum.
- 73, Ed
- At 09:35 AM 8/3/2016, K7RSG wrote:
- Sorry to reply twice, but this question caused me to be overcome with nostalgia for old radios.
- The Motorola Modar marine radio was the basis for the only official ham radio Motorola ever made, the Metrum.
- Single receiver Modar 55/75 here. http://mmncny.org/wp-content/uploads/2012/04/IM001295_800.jpg
- Here is a picture of a Metrum manual http://www.radio-mart.net/images/P/IMG_9864.jpg
- I had Metrum, but gave it away... like an idiot.
- I can't find a picture of the dual receiver Modar.... When I worked at Rogers Marine, back in the dark ages, we sold a lot of these, now they're all gone.
- 73 DE K7RSG
- On Wednesday, August 3, 2016 at 9:55:22 AM UTC-7, Edward R Cole wrote:
- Recently mentioned new "rover" (F250 truck) is getting a new radio.
- I bought the new Alinco DR735T and will install it with separation
- kit so control panel will be attached to lower area of dash and radio
- in locked compartment under back seat. Â I also bought an 8-ohm mobile
- speaker since the radio speaker is located in the body of the radio.
- But this is a dual-band radio and has two external speaker jacks and
- I only have room for one speaker, up front. Â So wonder if anyone has
- combined two speaker outputs to drive a common speaker. Â Google
- suggests the simplest method is using isolation resistors in a wye
- configured cable. Â I have a dual 10K pot which can be used to
- determine the best resistance to use with trade-off between isolation
- and attenuation of the audio.
- I know I could just run two speaker cables to a switch but that would
- preclude monitoring two frequencies simultaneously which this radio
- does, nicely.
- I am also looking for a inexpensive TNC for running APRS (no texting
- while driving). Â Looking at TinyTrak4 ($65.00) and Argent Tracker3
- ($95.00) (they have a mini-board that embeds in the DR135 so wonder
- if I can incorporate it into my DR735? Â question for Argent. Â I have
- an old Garmin GPS that can be located on the back window for short
- connection to TNC.
- Also looking at Garmin GPS Mappers and wondering if a Trucker model
- would be better as they identify low clearance overpasses (for
- traveling with our new 5th wheel trailer).
- Sorry lots of questions. <BTW getting 21.5 mpg after filling tank and
- resetting mileage meter>
- 73, Ed - KL7UW
- http://www.kl7uw.com
-    "Kits made by KL7UW"
- Dubus Mag business:
-    dubu...@gmail.com
k6...@juno.com
Aug 4, 2016, 1:15:34 AM8/4/16
to kl...@acsalaska.net, pnw...@googlegroups.com
Ed,
My Alinco DR590 has 2 jacks also, but one of the jacks puts
out audio from both bands. I have one speaker on the wall and
it plays both bands.
Mebbbe that DR735 is the same way ?
73
John, K6YK
On Wed, 03 Aug 2016 08:55:13 -0800 Edward R Cole <kl...@acsalaska.net>
writes:
>
> combined two speaker outputs to drive a common speaker. Google
New Muscle Building Science Lets Smaller Guys Bulk Up ...
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http://thirdpartyoffers.juno.com/TGL3141/57a2cf73508114f7359b2st51vuc
My Alinco DR590 has 2 jacks also, but one of the jacks puts
out audio from both bands. I have one speaker on the wall and
it plays both bands.
Mebbbe that DR735 is the same way ?
73
John, K6YK
On Wed, 03 Aug 2016 08:55:13 -0800 Edward R Cole <kl...@acsalaska.net>
writes:
> Recently mentioned new "rover" (F250 truck) is getting a new radio.
>
> I bought the new Alinco DR735T and will install it with separation
> kit so control panel will be attached to lower area of dash and
> radio
> in locked compartment under back seat. I also bought an 8-ohm
>
> I bought the new Alinco DR735T and will install it with separation
> kit so control panel will be attached to lower area of dash and
> radio
> mobile
> speaker since the radio speaker is located in the body of the
> radio.
>
> But this is a dual-band radio and has two external speaker jacks and
>
> I only have room for one speaker, up front. So wonder if anyone has
> speaker since the radio speaker is located in the body of the
> radio.
>
> But this is a dual-band radio and has two external speaker jacks and
>
>
> combined two speaker outputs to drive a common speaker. Google
> suggests the simplest method is using isolation resistors in a wye
> configured cable. I have a dual 10K pot which can be used to
> determine the best resistance to use with trade-off between
> isolation
> and attenuation of the audio.
>
> I know I could just run two speaker cables to a switch but that
> would
> preclude monitoring two frequencies simultaneously which this radio
>
> does, nicely.
>
> I am also looking for a inexpensive TNC for running APRS (no texting
>
> while driving). Looking at TinyTrak4 ($65.00) and Argent Tracker3
> isolation
> and attenuation of the audio.
>
> I know I could just run two speaker cables to a switch but that
> would
> preclude monitoring two frequencies simultaneously which this radio
>
> does, nicely.
>
> I am also looking for a inexpensive TNC for running APRS (no texting
>
> ($95.00) (they have a mini-board that embeds in the DR135 so wonder
>
> if I can incorporate it into my DR735? question for Argent. I have
>
>
> an old Garmin GPS that can be located on the back window for short
> connection to TNC.
>
> Also looking at Garmin GPS Mappers and wondering if a Trucker model
>
> would be better as they identify low clearance overpasses (for
> traveling with our new 5th wheel trailer).
>
> Sorry lots of questions. <BTW getting 21.5 mpg after filling tank
> and
> resetting mileage meter>
>
> 73, Ed - KL7UW
> http://www.kl7uw.com
> an old Garmin GPS that can be located on the back window for short
> connection to TNC.
>
> Also looking at Garmin GPS Mappers and wondering if a Trucker model
>
> would be better as they identify low clearance overpasses (for
> traveling with our new 5th wheel trailer).
>
> Sorry lots of questions. <BTW getting 21.5 mpg after filling tank
> and
> resetting mileage meter>
>
> 73, Ed - KL7UW
> http://www.kl7uw.com
> --
> ~The Voice of the Pacific NorthWest VHF Society~
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New Muscle Building Science Lets Smaller Guys Bulk Up ...
<p>If you work out regularly you know there is a point at which your ...
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VA7OTC JD Erskine
Aug 4, 2016, 3:15:42 AM8/4/16
to pnw...@googlegroups.com
On 2016-08-03 2207, k6...@juno.com wrote:
> Ed,
> My Alinco DR590 has 2 jacks also, but one of the jacks puts
> out audio from both bands. I have one speaker on the wall and
> it plays both bands.
>
> Mebbbe that DR735 is the same way ?
>
> 73
> John, K6YK
It would appear to not be the case.
> Ed,
> My Alinco DR590 has 2 jacks also, but one of the jacks puts
> out audio from both bands. I have one speaker on the wall and
> it plays both bands.
>
> Mebbbe that DR735 is the same way ?
>
> 73
> John, K6YK
---
http://radioaficion.com/cms/alinco-dr-735/
which has pic-a-tures, says in part, "External speakers can be connected
to the main sub-only, two external speaker terminals (available in one)"
An accompanying photo shows two 3.5mm (1/8") jacks.
What is meant isn't clear at all.
---
http://www.brickolore.com/2016/06/alinco-dr-735.html
and
http://www.alinco.com/Products/ham/mbl/DR-735/
itself
offer, "Two speaker ports located on the back of the unit allow you to
separate signals by both right and left sides or by internal or external
speakers using audio from a single external source."
Also a tad ambiguous.
---
http://www.universal-radio.com/catalog/fm_txvrs/0735rear.html
has what appears to be an image of a manual page which states there are
two external speaker jacks, SP1 and SP2. I found the same textual data
in the actual manual (below.)
---
http://www.alinco.com/pdffiles/ is where one may download the manual,
which states,
1 External Speaker Jack 1 [SP1]
Connects an external 8 ohm speaker. Outputs audio of the right band.
When another speaker is not connected to [SP2], left band audio is heard
through internal speaker. Also [SP1] used for connecting clone or PC cables.
2 External Speaker Jack 2 [SP2]
Connects an external 8 ohm speaker. Outputs audio of the left band. When
another speaker is not connected to [SP1], right band audio is heard
through internal speaker
---
Cheers es 73, John VA7OTC
Joe Hamelin
Aug 4, 2016, 3:42:31 AM8/4/16
to gpd...@gmail.com, PNWVHFS
I love the batwing. I have a pile of HT1000s and just put a 110W VHF MCS2000 in the Volvo wagon. -Joe
--
Joe Hamelin, W7COM, Tulalip, WA, +1 (360) 474-7474
Joe Hamelin, W7COM, Tulalip, WA, +1 (360) 474-7474
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