Hammurlund SP600 S Meter Issues
Radiola
I'm the owner of an SP600 now aligned, and receiving well. The only
issue I'm stuck on is the signal strength meter is not reading. The
AVC (?) side where it reads modulation works when switched in, but no
S reading. This indicates a live meter, but why no signal strength on
any signals? Strong or weak, nothing registers. Any ideas or
suggestions?
Thanks,
GB
Richard Knoppow
"Radiola" <n9...@yahoo.com> wrote in message
news:c675385d-2bee-4344...@a7g2000yqk.googlegroups.com...
The S meter reads carrier level at the detector and is
switched off when in Man RF gain contol. Make sure the
momentary meter switch is working properly. You can squirt
some contact cleaner into it around the terminals. I've had
one go dead until cleaned. Other than that make sure the
side of the AVC-MAN switch that connects the meter is good.
Again, some contact cleaner there may fix the problems.
Also, check the meter level adjustment to make sure its not
all the way off and is not open. This is a very simple
circuit and not very much can go wrong with it.
BTW, the meter will vary with the modulation level on
AM because the AVC time constant is so fast. You can slow it
down if you like by hanging a capacitor across the AVC
terminals on the back of the RX. This will also cure low
frequency intermodulation distortion in the audio.
--
Richard Knoppow
Los Angeles
WB6KBL
dick...@ix.netcom.com
Radiola
Thanks Richard,
I will give this a try. There's been a garden variety of contact
problems with this receiver because of where it was stored, so on.
Hopefully this may do the trick. Again, thank you for your help.
Thanks,
GB.
Richard Knoppow
Thanks Richard,
Thanks,
GB.
First thing make sure the RF Meter adjustment on the
back is turned up. If turned down all the way the meter
won't register.
SP-600s are great receivers.
--
Richard Knoppow
Los Angeles
WB6KBL
Radiola
Yes sir, I believe I did that but next time I tackle work on the rig,
I'll look at that as well.
Thanks,
GB.