ICOM IC-2720H Crossband repeater function
Chris W
IC-2720H. I downloaded the manual to get more information and found
none. Can someone shed more light on how this works. Does it only
work on one set of frequencies? The example page at
http://www.universal-radio.com/catalog/fm_txvrs/0272cross.html gives no
indication on how you would enter the frequencies you won't want to
use. It just shows a 2M to 440 repeater function. What if you want to
do 440 to 2 meter?
What about just using it as a simple repeater, do any of the mobile rigs
have that ability?
--
Chris W
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Swinburne
>Universal radio talks about this Crossband repeater function of the ICOM
>IC-2720H. I downloaded the manual to get more information and found
>none. Can someone shed more light on how this works. Does it only
>work on one set of frequencies? The example page at
>http://www.universal-radio.com/catalog/fm_txvrs/0272cross.html gives no
>indication on how you would enter the frequencies you won't want to
>use. It just shows a 2M to 440 repeater function. What if you want to
>do 440 to 2 meter?
>
>What about just using it as a simple repeater, do any of the mobile rigs
>have that ability?
The ICOM IC-2720H is a two way cross-band repeater. 2m to 440 and 440
to 2m are the same thing. You just set a 2m simplex frequency on one
side and a 440 frequency on the other side. It doesn't matter which
side you use for which. It works on any frenquency in the band. Be
careful to pick two that are not used and two that are not harmonics
of each other.
With the frequencies set, hold "set, dupe, and low" buttons for a
couple of seconds until you get two flashing L's in the display.
Set one handheld to the 2m frequency and another to the 440 frequency.
They will talk to each other through the 2720.
Or you can set one side of the 2720 to the frequency of a local
repeater and the other side to simplex, and use it to "boost" your
handheld through to the repeater.
You can't use the ICOM IC-2720H as a repeater on one band.
Check these sites for refrence and more information.
Roger
>Universal radio talks about this Crossband repeater function of the ICOM
>IC-2720H. I downloaded the manual to get more information and found
>none. Can someone shed more light on how this works. Does it only
>work on one set of frequencies? The example page at
>http://www.universal-radio.com/catalog/fm_txvrs/0272cross.html gives no
>indication on how you would enter the frequencies you won't want to
>use. It just shows a 2M to 440 repeater function. What if you want to
>do 440 to 2 meter?
>
>What about just using it as a simple repeater, do any of the mobile rigs
>have that ability?
I use my Kenwood TM-D700 in what they refer to "Locked" cross band. I
transmit on the 440 band with my HT into the TM-D700 in the car. It
retransmits on the input to the local repeater on 2-meters. I listen
to the output of the 2-meter repeater directly with the HT.
_In_most_cases I've found the two way cross band to be almost unusable
as it requires the repeater to drop before you can transmit. When
things are really busy with emergency operations such as weather
watches or a busy traffic net it's been next to useless, but the "one
way" works very well. Possibly there are rigs that operate cross band
that don't require the repeater to drop which would be really nice.
Roger Halstead (K8RI & ARRL life member)
(N833R, S# CD-2 Worlds oldest Debonair)
www.rogerhalstead.com
Matt
news:c6nvl197n1hj8hpvf...@4ax.com...
Not sure about the 2720, but using my Alinco DR610T, I have no problems
crossband repeating and find it particularly useful in WICEN events (civil
emergency comms in VK) - if the repeater doesn't have a very short tail, I
set the 610 up so that it will not retrans the 2m repeater signal back on
70cm (I set a receive tone that differs from what the repeater has on TX),
thus I can quickly jump in when needed. This does of course rely on me
being able to hear the repeater that I am linking to on my handheld as well
as in the car. Comes in very handy and has enabled me to be some distance
from the car in areas that I would otherwise be unable to access the
repeater (i.e. in gullies or similar).
Matt
Roger
wrote:
>"Roger" <Delete-Invalli...@tm.net> wrote in message
>news:c6nvl197n1hj8hpvf...@4ax.com...
>> On Mon, 24 Oct 2005 23:56:54 -0500, Chris W <1qa...@cox.net> wrote:
>> I use my Kenwood TM-D700 in what they refer to "Locked" cross band. I
>> transmit on the 440 band with my HT into the TM-D700 in the car. It
>> retransmits on the input to the local repeater on 2-meters. I listen
>> to the output of the 2-meter repeater directly with the HT.
>>
>> _In_most_cases I've found the two way cross band to be almost unusable
>> as it requires the repeater to drop before you can transmit. When
>> things are really busy with emergency operations such as weather
>> watches or a busy traffic net it's been next to useless, but the "one
>> way" works very well. Possibly there are rigs that operate cross band
>> that don't require the repeater to drop which would be really nice.
>>
>> Roger Halstead (K8RI & ARRL life member)
>> (N833R, S# CD-2 Worlds oldest Debonair)
>> www.rogerhalstead.com
>
>Not sure about the 2720, but using my Alinco DR610T, I have no problems
>crossband repeating and find it particularly useful in WICEN events (civil
>emergency comms in VK) - if the repeater doesn't have a very short tail, I
>set the 610 up so that it will not retrans the 2m repeater signal back on
>70cm (I set a receive tone that differs from what the repeater has on TX),
I wondered how you got around that. I have a DR-610T as well here in
the shack (TM-D700 in the car and TM-V7A in the shop) and had never
gotten around to making it work on cross band one way. With it I have
the option of stacked beams at 130 feet, or a side mounted duo band
collinear at about roof top level. Surprisingly the beams do a better
job of keeping me out of the next nearest repeater than the much lower
vertical.
Programming the 610T is interesting as my manual is wrong. I ended up
figuring it out, but following the manual that came with it just
doesn't work.
>thus I can quickly jump in when needed. This does of course rely on me
>being able to hear the repeater that I am linking to on my handheld as well
>as in the car. Comes in very handy and has enabled me to be some distance
>from the car in areas that I would otherwise be unable to access the
>repeater (i.e. in gullies or similar).
My yard is a good example. I can hear the repeater well, but it
doesn't hear me.
OTOH so is my shop. The shop is 28 X 40' with vinyl siding, but the
interior (walls and ceiling) is finished off with barn metal which
makes a whale of a good RF shield.
>
Roger Halstead (K8RI & ARRL life member)
(N833R, S# CD-2 Worlds oldest Debonair)
www.rogerhalstead.com
>
>
>Matt
>
Matt
> >Not sure about the 2720, but using my Alinco DR610T, I have no problems
> >crossband repeating and find it particularly useful in WICEN events
(civil
> >emergency comms in VK) - if the repeater doesn't have a very short tail,
I
> >set the 610 up so that it will not retrans the 2m repeater signal back on
> >70cm (I set a receive tone that differs from what the repeater has on
TX),
>
> I wondered how you got around that. I have a DR-610T as well here in
> the shack (TM-D700 in the car and TM-V7A in the shop) and had never
> gotten around to making it work on cross band one way. With it I have
> the option of stacked beams at 130 feet, or a side mounted duo band
> collinear at about roof top level. Surprisingly the beams do a better
> job of keeping me out of the next nearest repeater than the much lower
> vertical.
Another option is to put the 2m side on simplex on the input freq, but you
do run the risk of having others keying your Xband back onto 70cm (unless
you also have a receive tone enabled). Some repeaters also have a tone on
TX that is imposed on the signal only when the RX in the repeater is
tripped - thus giving you back control of the Xband repeat function.
> Programming the 610T is interesting as my manual is wrong. I ended up
> figuring it out, but following the manual that came with it just
> doesn't work.
You are not wrong there - as with most of my radio gear, the manual stays in
the drawer until I need to bring it out to undo the problems caused by
pushing buttons at random. I do like the Xband function of the DR610 - much
better than the TM-700D which uses a menu choice that is difficult to
remember unless you use it every day.
> My yard is a good example. I can hear the repeater well, but it
> doesn't hear me.
>
> OTOH so is my shop. The shop is 28 X 40' with vinyl siding, but the
> interior (walls and ceiling) is finished off with barn metal which
> makes a whale of a good RF shield.
Yep, not a bad little RF shield you have there. Almost as good tempest
shielding as my room (about 8 inches of concrete with heaps of reo to keep
it together - my 817 with the stock antenna has great problems even hearing
repeaters other than the local 2m one about 800 metres up the road. Must
remember to put the 3 element beam back up on the wall one day (has tobe
better than the stock whip that comes with the radio).
Matt