Where is S504? I see S501, S502 and S503 but no S504 in the schematic or parts
list.
I personally think that the 8kc mechanical filter now has a high insertion loss
due to the internal "rubber" isolator turning into goo or perhaps a weld
connecting a wire to a disk has failed. I have seen both. If one has any
mechanical skill and patients, the filter can be repaired by careful
disassembly and replacing the "rubber" isolator. If it is a broken weld, the
filter is toast. The filter repair info is in the Pearls of Wisdom,
IIRC.Regards,Jim
Logic: Method used to arrive at the wrong conclusion, with confidence. Murphy
On Sunday, January 12, 2025 at 11:20:20 AM CST, Jacques Fortin
<jacque...@videotron.ca> wrote:
Hi Jerry,
Yes: we do not know what happened before with these old modules...
A bad previous repair or a defective S504 contact can be involved.
A full check is in order, IMHO.
73, Jacques, VE2JFE in Montreal
Maybe something as simple as a cold solder joint on the switch?
Jerry NY2KW
______________________________________________________________
R-390 mailing list
Home: http://mailman.qth.net/mailman/listinfo/r-390
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:R-390@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
______________________________________________________________
R-390 mailing list
Home: http://mailman.qth.net/mailman/listinfo/r-390
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:R-390@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
