Message-ID: <5.1.0.14.2.20021020084059.00a14b80@mail.pncl.co.uk>
Date: Sun, 20 Oct 2002 08:49:21 +0100
To: rsgb_lf_group@blacksheep.org
From: "Walter Blanchard" <blanch@pncl.co.uk>
In-reply-to: <3.0.5.32.20021020202556.00823e10@pop3.xtra.co.nz>
MIME-Version: 1.0
Subject: Re: LF: ICOM 706 Mk2
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At 20:25 20/10/02 +1300, ZL4MD wrote:

>  I use my IC706 as signal source for the 180 KHz transmitter, dividing by
>100 from the 18 Mhz band - and it works like a charm {our ZL band is
>165-190 kHz}.
>
>At some stage I believe that our allocation will be extended to include the
>136/137 region and would like to use this same divide by 100 scheme,
>starting in the 13.6 Mhz region. My problem is that the 706 will not
>transmit below 13.9 MHz.  I have been told that a simple "mod" will cure
>things. Can anyone tell me what to do? One story told of cutting a yellow
>wire somewhere but the details were a bit vague and may have been for a
>totally different reason.
>
>Any advice would be appreciated.
>
>Kevin
>ZL4MD


Kevin,

I wouldn't advise using the 706 for this purpose even if you get it down to 
136. Its local
oscillator is rather "wobbly" due to the action of its internal fan and you 
won't find it stable
enough for narrow-band QRSS etc. I have one and I installed the "hi-stab" 
option which
made it even worse by introducing a second TCXO-induced wobble. Total 
wobble is only
at 136 is only a few Hz and doesn't normally matter but it does when you're 
looking for
0.01 Hz! ICOM told me the 706 was never designed for ultra-stable 
narrow-band work,
only for HF mobile.

I use an old ICOM 720 with purple diode wire cut which enables Tx on all 
frequencies and divide
down from 13.6 MHz. After an hour or so for warm-up it's perfectly acceptable.

Walter G3JKV.
   

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