[time-nuts] Rpair of an 8662 HP Generator
Rob Sherwood.
rob at nc0b.com
Sat Apr 16 02:53:09 UTC 2016
With the improvement in the top radios today, it is no longer possible to test them with my 8662A / 8663A generators. I have had to move to 8642A / 8642B. However for more general sig gen needs, I prefer the 8662A.
Rob
NC0B
-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of KA2WEU--- via time-nuts
Sent: Friday, April 15, 2016 7:26 PM
To: paulswedb at gmail.com; time-nuts at febo.com
Subject: Re: [time-nuts] Rpair of an 8662 HP Generator
Thanks, I do not have a repair manual and I hate to abandon the signal generator after man years of positive use... Ulrich
In a message dated 4/15/2016 9:14:21 P.M. Eastern Daylight Time,
paulswedb at gmail.com writes:
Ulrich
To your first question I am unaware of anyone that repairs them. Though
there are many places that might, typical cal and repair shops. I have a sick
8662 also (age) and need to dig in. At least I know the board and the most
likely issue. The yahoo user group has a lot of useful details.
Regards
Paul
WB8TSL
On Fri, Apr 15, 2016 at 7:08 PM, Dr. Ulrich Rohde via time-nuts
<_time-nuts at febo.com_ (mailto:time-nuts at febo.com) > wrote:
Thanks
Sent from my iPhone
On Apr 15, 2016, at 6:38 PM, "John Miles" <_john at miles.io_
(mailto:john at miles.io) > wrote:
>> My signal generator has a poor, intermittent power supply. The RF
>> section is ok. Who can please tell me which company can and will fix
these
>> older
>> but excellent generators?
>>
>> Thanks, Ulrich
>
> Have a look at the capacitors in the voltage divider that drives the
bases of the switching transistors. There's a good chance that's your
problem, and they probably need to be replaced even if not. 75-TVA1607 (Mouser
p/n for Sprague TVA1607) works well.
>
> It would be nice to use 105C parts if you can find some, but the 85C
TVA1607s have worked well for me in multiple 8662As over several years.
>
> The other likely suspect is one of the large screw-terminal
electrolytics on the motherboard. The power supply can almost-but-not-quite start up
when one of those is completely open. High ESR is very likely to cause
intermittent operation.
>
> -- john, KE5FX
> Miles Design LLC
>
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