[ICOM] IC-756 - CW problem - and on Christmas yet!

[Gary Fiber]

Well RF getting into the power supply. I don't know how many calls I took 
over the years with Early Astron's doing the same thing. When I worked for 
Icom I used to send out little drawings on how to install some bypass caps 
into the Astron to prevent that from happening. The 723 voltage regulator 
in the Astron did not like RFI.

Luckily for you and others the power supply did not go over voltage. Astron 
has since fixed that issue. I have an Astron 35 and no problems with it.
We had one guy who I went a number of rounds with his IC-735 sticking into 
transmit. He argued it could not be his supply. The supply was dropping 
like yours and causing the 735 to hang in transmit.
I convinced him to try a PS-55, he did so kicking and screaming, but his 
troubles went away. He was using an Astron RS-20 at that time.

Good Find and Fix I am glad its working for you Carl.

Gary K8IZ

At 09:15 AM 12/26/2004, you wrote:
>Thanks to everyone for all the good suggestions. As with everything 
>electronic, there was more than one issue.
>
>1. MFJ Mighty Lite power supply sags from 13.8 vdc no load down to less 
>than 11.4 vdc during normal CW keying, down to 10.6 vdc during keydown of 
>more than 5 seconds. I will begin immediate search for better power supply.
>
>2. DC cable from PS to 756 running parallel to and inches away from 
>antenna cable exiting LDG tuner. After doing power supply voltage 
>measurements, problem went away. Then came back after repositioning tuner 
>and Rigblaster.
>
>Brilliant ham radio solution: aluminum foil wrapped around power cord 
>(Icom's unshielded basic two large wires) to get it  past the length near 
>the antenna cable. Result: nice 20 minute CW full power QSO with KCØSHU 
>near Denver. (I'm near Minneapolis.)
>
>I do have some other lack-of-ground issues with shack in basement near any 
>true earth to plant a ground rod in, but that continues to be a work in 
>progress.
>
>Again thanks to everyone on the forum for their help and encouragement and 
>a good New Year to all.
>
>73 de Carl WCØV
>
>>
>
>----
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Gary Fiber K8IZ
GROL PG-19-6691
Washington State Resident