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

[Gary Fiber]

Carl,

Grab your voltmeter and look at the voltage the power supply is producing 
right at the entrance to the radio. There is enough room to slip the probes 
into the back of the DC plug . I would suspect the power supply is doing a 
nose dive when you transmit and or can't source enough current. Make sure 
if its an adjustable supply you are giving the radio enough current. Lastly 
i have seen RF radiation go through the DC power cord and get into supplies 
over the years. About the only way to sort that out is to try a battery in 
place of the supply or wind some of the DC cord around a torroid or ferrite 
stick.

Gary K8IZ.

At 09:46 AM 12/25/2004, you wrote:
>Calling all 756 experts. I finally decide to get serious about getting 
>back into CW operation after a LONG hiatus when my IC-756 decides to give 
>me grief.
>
>Briefly at any power level setting over 40 to 45%, when I attempt to key 
>the rig from the front panel keyjack using the built-in keyer or the rear 
>key jack direct, the 756 screen goes to full blue for a moment and the rig 
>resets itself to the previous mode! All bands, nothing connected except 
>the key, a dummy load attached to Ant 1, and the 12 vdc powersupply.  Even 
>when I have the tuner disengaged, when the rig comes back to life I can 
>hear the motors turning as if it is looking for a match. Shouldn't since I 
>am connected to the dummy load of 50 ohms.
>
>I would love to get the rig going on CW but with my indoor attic W9INN 
>dipole (good antenna courtesy of the late W9INN but lousy location) I need 
>all the power I can get from the 756.  Anyone ever observe this behavior 
>and anyone have a suggestion or remedy (other than sell/trade - already 
>thought of that and the 756 received is still better than 75% of the 
>current crop of rigs out there).
>
>73 and Merry Christmas,
>
>Carl WCØV
>wc0v at comcast.net

Gary Fiber K8IZ
GROL PG-19-6691
Washington State Resident