[ICOM] ICOM IC-271H

[David J. Ring, Jr.]

You're exactly right Gary, that was the cause of many problems with the 
'730.

If he can disconnect the microphone and get the radio to transmit by 
shorting the Push-to-talk pins, it will eliminate the flukey problem of 
having a condensor microphone squeeling - which would also do about the same 
thing.  (Unlikely but I've seen this.)

73

David N1EA

----- Original Message ----- 
From: "Gary Fiber" <gfiber at comcast.net>
To: "ICOM Reflector" <icom at mailman.qth.net>
Sent: Monday, November 28, 2005 10:13 PM
Subject: Re: [ICOM] ICOM IC-271H


Bill,

Give Scott Malcom a call or email. He will likely know for sure what
it might be, also Frank Ellis or Clif might have a handle on the cause.
If its transmitting full power in SSB without mic audio being applied
I would say oscilliation. On the 730 and some others it was a
switching transistor in the RF unit that would cause it.
This rig is similar.

Gary K8IZ


At 06:17 PM 11/28/2005, you wrote:
>ouch...  I think this thing has been that way for a few years,,,,
>I rarely transmit on it ,,,,maybe that is why it is still alive....
>guess it's going to be opened up.....
>
>
>is the oscillation within the output module  ??/   can it be tamed??
>tnx  Gary.....
>
>
>bill;
>
>At 01:53 PM 11/28/2005, you wrote:
>
>>Does it do that in all modes regardless of mic audio?
>>If so usually that indicates the PA is oscillating.
>>
>>Gary K8IZ
>>
>>
>>-------------- Original message --------------
>>
>> > before i try to re invent the wheel.... I will "ask the reflector".
>> >
>> > My 271A only puts out "full power" and will not reduce with the RF
>> > POWER control. Otherwise wonderful..
>> >
>> > Is this a common problem, I have not seen it here before that I
>> can remember.
>> >
>> > I should first go look at the _____________.
>> >
>> > bill ny9h
>> >
>> > ----
>> > Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
>> > Icom Users Net: Sundays, 1700Z, 14.316 MHz
>> > Icom FAQ: http://www.qsl.net/icom/
>>----
>>Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
>>Icom Users Net: Sundays, 1700Z, 14.316 MHz
>>Icom FAQ: http://www.qsl.net/icom/
>
>----
>Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
>Icom Users Net: Sundays, 1700Z, 14.316 MHz
>Icom FAQ: http://www.qsl.net/icom/

Gary Fiber K8IZ
GROL PG-19-6691
Washington State Resident


----
Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
Icom Users Net: Sundays, 1700Z, 14.316 MHz
Icom FAQ: http://www.qsl.net/icom/


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