[1000mp] 1000MP chirp on CW

Sun, 2 Nov 2003 12:44:59 +0000

Try shortening the DC leads, and even removing the fuses providing the
output of your power supply is fused!

a well known problem.

73 de g3yxx

In message <[email protected]>, Rod
Elliott <[email protected]> writes
>
>Hello Antero...
>
>I had the exact same problem with my MP.  I eventually diagnosed it as rf 
>feedback. The problem improved a bit by using clip-on ferrite chokes on the 
>leads in and out of the rig.
>
>The problem disappeared completely when I moved to a different QTH where my 
>antennas are now much farther away from the shack (50 meters).
>
>I always run my rig on mains power, but I have heard that the MP is more 
>sensitive to this problem when DC powered.
>
>Good luck
>73
>Rod Elliott VE3UW / VE3IRF
>
>
>At 14:18 11/01/03 +0200, you wrote:
>
>>Hi,
>>
>>Having a chirp problem with FT1000MP.
>>When transmitting with a short hold delay and allowing the
>>TX to trip, the beginning of next dash or dit represents a clear chirp.
>>However, increasing hold delay time, and having the rig "on the air" allows
>>chirp-free signal.
>>Since mains voltage is very stable, I first thought there is a voltage drop
>>in the DC cables between the rig and power supply, and shortened these to
>>minimum. No improvement.
>>I suspect one of the oscillators might have a "local energy bank" capacitor
>>which doesn't recharge fast enough or cannot hold its charge level. But
>>which ????
>>
>>Has anyone experience a similar problem / how was it fixed ?
>>
>>Thanks in advance for help.
>>
>>73,  Antero, OH2BEM
>>
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>
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-- 
David W Wood