KL40 amp problems
Ken
seem to be working. I have emailed RMITALY and am waiting for a
response.
They draw 180ma whether on or off. When driven with 3 watts AM into a
50 ohm dummy load, it draws 500ma (whether on or off) but has no RF
output.
An SWR meter shows very high SWR between the radio and the amp.
With the amp out of the circuit, I see 1.0 SWR and 3 watts on the
meter.
With power to the amp off, and 3 watts AM in, there is no RF out.
Three KL40's I've tested are doing the same thing.
Is it possible they switched the wiring to the PL-259's for a big run
of these?
Anyone seen this problem with KL40's?
Ken
(to reply via email
remove "zz" from address)
Ken
>Is it possible they switched the wiring to the PL-259's for a big run
>of these?
Ooops. I meant SO-239's.
Twistedhed
Just a thought,,,,can your dummy load be bad?
NO RF output at all doesn't seem probable on all three units. Try keying
it in real time on the air,,,then report back with frequency and
results. I know an ambulance driver that owns one,,never had a problem
with his after he had it tweaked in south St. Pete, but man he sure does
bleed. I left a message on his answering machine and gave him your
email. Good luck.
tn...@mucks.net
Is this your amp?
http://www.rmitaly.com/download/manuals/KL40-Manual_rel_300.pdf
tn...@mucks.net
http://www.rmitaly.com/download/instructions/KL40-Instruction.pdf
Ken
>Is this your amp?
>http://www.rmitaly.com/download/manuals/KL40-Manual_rel_300.pdf
As far as I know, Yes.
RM has three different PDF manuals for the KL40 and their might be
differences.
Ken
(Twistedhed) wrote:
>Just a thought,,,,can your dummy load be bad?
>NO RF output at all doesn't seem probable on all three units. Try keying
>it in real time on the air,,,then report back with frequency and
>results. I know an ambulance driver that owns one,,never had a problem
>with his after he had it tweaked in south St. Pete, but man he sure does
>bleed. I left a message on his answering machine and gave him your
>email. Good luck.
When the amp is out of the circuit, I have the radio going into the
meter and dummy load. The meter shows SWR=1.0 (as it should) and
approximately the same power as the radio meter.
One other oddity. Before I power up the radio, the amp is drawing
zero current. As soon as I power up the radio (on RX), the amp starts
drawing 180 ma, whether it is switched on or off.
I assume this amp has transmit sense and can be used with a
transceiver.
tn...@mucks.net
>One other oddity. Before I power up the radio, the amp is drawing
>zero current. As soon as I power up the radio (on RX), the amp starts
>drawing 180 ma, whether it is switched on or off.
Impossible. The amp has no input for the powered condition of the
radio (receive).
Do you have the coax in-out connected backwards?
Frank Gilliland
>
>>One other oddity. Before I power up the radio, the amp is drawing
>>zero current. As soon as I power up the radio (on RX), the amp starts
>>drawing 180 ma, whether it is switched on or off.
>
> Impossible. The amp has no input for the powered condition of the
>radio (receive).
Wrong -- it's very possible. That is a MOSFET amp with no power switch. A bad
combination to be sure, because as long as there is source-drain voltage, any
kind of signal can drive it to some extent. It's possible that C1 could be
shorted (after all, it's only rated for 50 volts) and the output of the radio
have a DC component. Or if D2 is blown (a 1N4148 passing 3 watts -- yikes!) D1
will hold a nice, steady DC bias on the MOSFET. There are a lot of possible
scenarios for what he is describing. What -is- impossible is for you to think
before you demonstrate your ignorance. Haven't we been through this before,
Tnom? Didn't you learn anything the first dozen times?
But hey, it's a cheap and crappy amp, and you get what you pay for.
>Do you have the coax in-out connected backwards?
You have your brain connected backwards. Quit trying to act like you know what
you are talking about.
-----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
http://www.newsfeeds.com - The #1 Newsgroup Service in the World!
-----== Over 100,000 Newsgroups - 19 Different Servers! =-----
tn...@mucks.net
<spa...@NOSPAMaimcomm.net> wrote:
>In <8abt30lp124uj1slt...@4ax.com>, tn...@mucks.net wrote:
>
>>
>>>One other oddity. Before I power up the radio, the amp is drawing
>>>zero current. As soon as I power up the radio (on RX), the amp starts
>>>drawing 180 ma, whether it is switched on or off.
>>
>> Impossible. The amp has no input for the powered condition of the
>>radio (receive).
>
>
>Wrong -- it's very possible. That is a MOSFET amp with no power switch. A bad
>combination to be sure, because as long as there is source-drain voltage, any
>kind of signal can drive it to some extent. It's possible that C1 could be
>shorted (after all, it's only rated for 50 volts) and the output of the radio
>have a DC component. Or if D2 is blown (a 1N4148 passing 3 watts -- yikes!) D1
>will hold a nice, steady DC bias on the MOSFET. There are a lot of possible
>scenarios for what he is describing. What -is- impossible is for you to think
>before you demonstrate your ignorance. Haven't we been through this before,
>Tnom? Didn't you learn anything the first dozen times?
>
>But hey, it's a cheap and crappy amp, and you get what you pay for.
>
>
>>Do you have the coax in-out connected backwards?
>
>
>You have your brain connected backwards. Quit trying to act like you know what
>you are talking about.
>
I stand by my post. There is no voltage on the radios coax on receive
that will activate the amps increase in current draw. You should pay
more attention. Even if there was a DC voltage C1 on the amp would
block it.
"You have your brain connected backwards. Quit trying to act like you
know what you are talking about." I just couldn't resist.
http://www.rmitaly.com/download/instructions/KL40-Instruction.pdf
tn...@mucks.net
I forgot to mention.....C1 can't be shorted on all three amps
Ken
>I just bought a few of these for myself and friends. None of them
>seem to be working.
Problem is solved. These are for export and need to be "converted" to
work with American electrons. ;-)
Twistedhed
From: Frank Gilliland <spa...@NOSPAMaimcomm.net> Group:
rec.radio.cb Subject: Re: KL40 amp problems Date: Thu, Feb
26, 2004, 8:58pm (EST-3) X-Trace: corp.newsgroups.com 1077857940
216.64.140.70 (26 Feb 2004 22:59:00 -0600) X-Comments: This
message was posted through <A href X-Comments2: IMPORTANT:
Newsfeed.com does not condone, X-Report: Please report illegal or
inappropriate use to X-Comments3: <A href
="http://www.newsgroups.com">Visit Organization: Newsfeeds.com
http://www.newsfeeds.com 100,000+ UNCENSORED Newsgroups.
One other oddity. Before I power up the radio, the amp is drawing zero
current. As soon as I power up the radio (on RX), the amp starts drawing
180 ma, whether it is switched on or off.
( Impossible. The amp has no input for the powered condition of the
radio (receive). )
>Wrong -- it's very possible. That is a MOSFET
>amp with no power switch. A bad combination
>to be sure, because as long as there is
>source-drain voltage, any kind of signal can
>drive it to some extent. It's possible that C1
>could be shorted (after all, it's only rated for 50
>volts) and the output of the radio have a DC
>component. Or if D2 is blown (a 1N4148
>passing 3 watts -- yikes!) D1 will hold a nice,
>steady DC bias on the MOSFET. There are a
>lot of possible scenarios for what he is
>describing. What -is- impossible is for you to
>think before you demonstrate your ignorance.
Heal thyself. In the first manner, there is no need for projected
disdain and insult towards one who you disagre with. Keeping wiht the
subject of the group and discussing the electronic possibilities that
may or may not be wrong without insult is a good way to try and lose the
deficit in communication you portray that has you becoming an insultive
jack ass to a poster in a group for merely offering a differing point of
=view than yourself. Your level of intolerance for differing views
llustrates your true level of intellect and communication skills.
The chance of probablility you offer concerning your weak input
concerning all three amps having the same short is ridiculous, like most
of your ignorant and abusive posts that were responsible for you having
no choice but to subscribe to a pay access in order to access the group
in the most obsessive manner.
The likelihood of one individual being correct increases in a direct
proportion to the intensity with which others try to prove him wrong
Twistedhed
I just bought a few of these for myself and friends. None of them seem
to be working.
_
>Problem is solved. These are for export and
>need to be "converted" to work with American
>electrons. ;-)
>Ken
>(to reply via email)
Just make sure you get a competent tech to perform the marriage
ceremony correctly between the radio and amp, not one who impersonates a
tech and claims you should probably replace c-1 in all three brand new
amps.
Frank Gilliland
>On Fri, 27 Feb 2004 05:14:24 -0500, tn...@mucks.net wrote:
<snip>
>I forgot to mention.....C1 can't be shorted on all three amps
It can if the cause of the short is common to all three amps, such as a fault in
the radio testing the amps. I guess you -didn't- learn the first dozen times.
Frank Gilliland
(Twistedhed) wrote:
Better yet, find a tech who understands that "There are a lot of possible
scenarios for what he is describing".
-----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
tn...@mucks.net
>scenarios for what he is describing".
Like a tech who believes three brand new amps have shorts in C1?
You'd do a better job in enhancing your worth to this group if you'd
post with a little more manners, use common sense, and also know when
not to post?
Frank Gilliland
>>Better yet, find a tech who understands that "There are a lot of possible
>>scenarios for what he is describing".
>
>Like a tech who believes three brand new amps have shorts in C1?
Did I say I believe they all had bad caps? No. I said it was -possible-, and it
is. Better read more carefully or TwistyDave is going to start whining about
your communication deficits.
>You'd do a better job in enhancing your worth to this group if you'd
>post with a little more manners, use common sense, and also know when
>not to post?
But I -do- know when not to post -- I don't post when I don't know what I'm
talking about, like issues regarding many popular radios such as Ranger, RCI,
etc. I don't know anything about those except that most are easily modified to
operate illegally. I couldn't tell you anything beyond that. What I -do- know is
how to read a schematic, how to analyze a bad circuit, and how to locate
possible causes of failure. And I -do- know how an RF amplifier works, as well
as the operational characteristics of each and every component, active and
passive. I -also- know that manufacturing processes can sometimes turn loose an
entire lot of bad products, whether they are the final products or their
components. And yes, I -also- know that sometimes there are unknown faults in
equipment that can cause failures in other equipment. And I -=ALSO=- know that
some people will keep replacing fuses as fast as they blow them without even
thinking that the fault is not the fuse. In other words, it is not uncommon for
someone to test two or more brand new products, discover that they are broken,
and not realize that they were rendered non-functional as a result of their own
bad test equipment or procedure. This happens quite frequently when the products
have very static sensitive components (such as MOSFET's). You have therefore
demonstrated that you have very little, if any, experience working with such
devices, and should probably take your own advice (learn when not to post).
Twistedhed
>But I -do- know when not to post -- I don't post
>when I don't know what I'm talking about,
HAhahah,,,,now that is genuinely funny. Thanks for the smiles, Sparkles.
tn...@mucks.net
>But I -do- know when not to post -- I don't post when I don't know what I'm
>talking about, like issues regarding many popular radios such as Ranger, RCI,
>etc. I don't know anything about those except that most are easily modified to
>operate illegally. I couldn't tell you anything beyond that. What I -do- know is
>how to read a schematic, how to analyze a bad circuit, and how to locate
>possible causes of failure. And I -do- know how an RF amplifier works, as well
>as the operational characteristics of each and every component, active and
>passive. I -also- know that manufacturing processes can sometimes turn loose an
>entire lot of bad products, whether they are the final products or their
>components. And yes, I -also- know that sometimes there are unknown faults in
>equipment that can cause failures in other equipment. And I -=ALSO=- know that
>some people will keep replacing fuses as fast as they blow them without even
>thinking that the fault is not the fuse. In other words, it is not uncommon for
>someone to test two or more brand new products, discover that they are broken,
>and not realize that they were rendered non-functional as a result of their own
>bad test equipment or procedure. This happens quite frequently when the products
>have very static sensitive components (such as MOSFET's). You have therefore
>demonstrated that you have very little, if any, experience working with such
>devices, and should probably take your own advice (learn when not to post).
What you fail to realize is that you don't know that you have no
common sense.
justin brown
%
> First time responding on here but I've been having an issue with high swrs on my kl 60 which I believe to be very similar to the kl 40. I have tested the swr in multiple ways in the system, with amp and without. To give a rundown of my setup I have 9ft of coax running from radio to amp because the radio is mounted on the ceiling console however you want to call it. I have the amp on the floor then I have the coax running out to the antenna which for that antenna I'm
wanting to say 17ft but I'm not sure what the antenna came with. The antenna is a tram 300. So without the amp being there and putting a meter there instead to check swrs, and with a meter at the back of the radio everything seems within reason swr wise. I'm getting between a 1.4 to 1.6 on 1 and 40 which I'm not complaining though when it rains it starts to climb on 40. My main issue is when taking a reading with the amp there but not on, taking it from the radio side or
antenna side it reads a 2 to 1 on 40. I suspect that the amp is the problem because everything checks out without it. Now get this, with the amp on, on the antenna side it drops back down to 1.6. So it's only high with amp being there and off unless I max radio power to amp when on then itll show 2 to 1 again. Anything below 3 or 4 watts deadkey its fine. So someone explain to me what inside an amp would give for a high swr when off, thanks.
>