[Icom] IC-706 MkII FM receive problem possible solution

Tue, 10 Sep 2002 08:52:23 +1200

Thanks guys for the idea.

 I have had the control so that the radio is unsquelched - IE hissing. It still seems oblivious to any signal there. Only when I have my handie talkie running 500mW into a 50 ohm dummy load in the proximity of about 4 inches away from a 5/8 antenna, do I hear anything. I have scanned up and down the band just in case the RX is off frequency but changing mode to SSB reveals a full out 20dB+ signal.

A mentioned before TX on FM mode is OK - I was think WFM was OK but I now think this is  down as well with the more testing I do. I had the RFgain/ SQL control about 10 o'clock  for max RF agin as well.

I am trying to decide how far back in the IF chain is affected but the circuit seems to split apart for WFM and FM modes but there is commonality between SSB etc and FM.

Anyway I keep looking.. I think I will need a Sig gennie to inject IF sigs but have no reference signal levels as to the sensitivity of the IF stages..    

73's de Simon.
ZL1SWW
Auckland NZ.

-----Original Message-----
From: W3UIO [mailto:[email protected]]
Sent: Tuesday, 10 September 2002 07:59
To: [email protected]
Subject: Re: [Icom] IC-706 MkII FM receive problem possible solution

Good idea, Stephen, but my 706 MK2 is the opposite.
The radio is squelched in the CLOCKWISE position.
Maximum RF gain is at ten o'clock.

I had a similar problem in that the radio went dead in
AM position. The squelch was fully clockwise. That was
the result of a habit of keeping RF gain controls
fully clockwise and forgetting that the 706 is
different.

--- [email protected] wrote:
> Hello,
>    Someone recently put a post out, could transmit
> on 2 fm, but no
> receive.   I passed it by at the time, but had a
> though on it.   Check
> your RF Gain/Squelch setting.  If you have RF
> gain/Squelch enabled for
> FM, and the knob is fully counter-clockwise, you
> won't have any receive. 
>  With the radio set up this way, you have normal
> operation with the
> squelch knob straight up at 12 oclock, moving it
> clockwise to 3 oclock it
> will act as a squelch control, but moving it to the
> left toward 9 oclock
> it acts as a RF gain control.   All the way to the
> left at 7 oclock the
> radio is about dead.    Just a possibility.
> 
> 73's de Stephen, K0SD in NC

=====
Larry, W3UIO

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