Very true.............with those old receivers that didn't have one of the
new types of product detectors, you had to run the unit with AGC off and use
back the RF gain down to eliminate the distortion. Newer receivers use a
mixer as an SSB detector.........the LO injection on these types of
detectors is run at about 10 times the expected level into the RF port. This
minimizes the distortion and allows the AGC to be run on these types of
signals.

Pete

"gb" wrote in message
...
"Andy Bullington" wrote in message
...
I have an old HQ140x I bought non working and after replacing the filter
andvarious other caps and a couple tubes, its up and running. I realigned
the RF section to good effect but I'm suspicious the BFO isn't working
quite right. I've replaced the suspect looking caps in the BFO can with
orange drops and it works but it's a lot trickier tuning in SSB than on my
HQ129x and strong CW signals seem to overload it easily. Any ideas?
Thanks.
Andy W1AWB
On older receivers, I often back down the RF gain control to prevent
overload on strong signals --
when using the BFO for SSB or CW reception. For those receivers that do
not have an RF Gain control, I use external attenuation.

gb