[1000mp] Mk V Field, strange behaviour!

[Art Searle W2NRA]

Dean has a point.  When I said I don't have the problem I forgot to 
mention I too have the roofing filter and Key clicks mod.  Doesn't 
everybody?

73
Art
W2NRA

Dean Fewkes wrote:
> Andy,
> 
> I have operated 2 Fields and they both did this. The problem was worse when
> the rigs were cold and just turned on. The problem is that some RF is still
> present when the rig switches to receive and that triggers the AGC. I think
> that this is common on most fields in the CW mode and I do not believe that
> is has been associated with any failures. On my own Field, the problem went
> away when I installed the roofing filter and the Inrad key click mod. I did
> the mods at the same time so I cannot say which one corrected the problem.
> 
> Dean Fewkes
> KG7MZ
> 
> 
> ----- Original Message ----- 
> From: "Andy Hamon" <andyh at cwgsy.net>
> To: <1000mp at mailman.qth.net>
> Sent: Sunday, April 10, 2005 1:23 PM
> Subject: [1000mp] Mk V Field, strange behaviour!
> 
> 
> 
>>Can anyone shed some light on a problem I have with my MkV Field???
>>As I am on my second Field in six months and both behaved the same, is it
> 
> a
> 
>>design "issue" or am I unlucky to have had two Duds?
>>
>>Here's the situation:
>>
>>When I use CW, 90% of the time, the S meter fires across to 60 over 9 when
>>the radio switches from TX to RX. Not a lot of fun if I am using full
>>break-in.
>>After various discussions with Yaesu, the message seemed to be "that is
> 
> just
> 
>>the way it is".
>>
>>As a "lab" test I hooked up a dummy load and pressed the MOX switch
> 
> without
> 
>>sending any code. No CW and no power out on the meter. When I  pressed the
>>MOX switch again the radio went back to receive and the S meter showed S9,
>>dropping to zero over time, typically half a second with fast AGC and two
> 
> to
> 
>>three seconds on slow AGC. On slow AGC the background noise seemed a bit
>>attenuated immediately the radio switched to RX and came back to full
>>strength as the S meter dropped to zero.
>>
>>I even tried a full CPU reset, but all that did was to give me half an
>>hour's work setting the radio up again!
>>
>>Any idea what is going on and if there is a mod to fix it?????
>>
>>I have spoken to various users of the Field who say the Inrad roofing
> 
> filter
> 
>>did wonders for the clicks & pops etc. I have one but have not fitted it
> 
> in
> 
>>case I get the Yaesu line " the problem has been created by modifying the
>>radio, warranty void".
>>
>>Can anyone help.
>>
>>Incidentally, if the AGC is switched OFF the problem does not exist, but
>>strong signals sound BAD (as you would expect) and on SSB the problem does
>>not exist.
>>
>>Thanks
>>
>>Andy, GU4WTN
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> 
> 
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