[Fwd: [AMPS] [Fwd: TL-922A power problem]]

[Rich Measures]

>
>
>
>On Tue, 23 Mar 1999 02:01:39 -0500 lerxst <lerxst@columbus.rr.com>
>writes:
>>another thing i notice is when i key the radio kinda quick the 
>>recieve
>>drops
>>alittle then when i do it again it comes right back.Weird?
>>danny
>
>Sounds like a thin insulating film has built up on the
>normally-closed contacts of the amp t-r relay. 


good point.  

>This is
>a very common problem in "dry" circuit switching (very
>low current). There's usually no problem on the normally-
>open side because the higher current punches through the film.
>Clean the contacts off the best you can with contact cleaner
>and light use of a fingernail file. On some relays, you can
>remove the spring and the contact assembly can then swing out
>for easy cleaning. 
>
>On the other problem, mismatch to the ts-850, you can always
>use the tuner in the 850. If it "hunts" instead of stopping,
>you can stop it manually and it will be close enough. Or,
>you could adjust the input nets on the amp, ......

€  One of the problems with the 922 is that the tuned input networks have 
too low a Q to work ok with solid-state radios.  The 922 adjustment 
screws do not change the Qs.   The fix is to raise the Q by increasing 
C.in and C.out, plus decrease L.   



Rich...

R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures  


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