"Eric F. Richards" wrote:

I presume you mean to display a frequency vs. signal strength graph...
the answer is yes -- they are called panoramic adaptors or
panadaptors. A more general device would be a spectrum analyzer, used
as a panadaptor.

You can expect to pay about $1500 for a new one, and at least one is
being made today. I bought one for about $100 and was only marginally
satisfied. I bought a spectrum analyzer for $300 that does a much
better job.


There are used Microdyne Spectrum displays floating around E-bay and
other surplus sources but you do not want them for a HF receiver. They
are made for real broadband applications in microwave Telemetry
systems. You would have to do a major redesign on the RF and IF
circuits to convert one to work with a HF radio and the CRT cost well
over $1000, if you can even buy one now that L3-Com dropped the
Microdyne products that supported their spectrum display. They go
cheap, but they are no bargain unless all you want is the CRT and HV
power supply. They require a couple amps on each of the 15 volt power
supplies, and are made to fit in the older receivers as a plug-in, or in
a rack mount accessories tray. They are not intended to be operated
outside of an approved cabinet because the HV power supply is exposed on
the Chassis, and it can kill.


--
Link to my "Computers for disabled Veterans" project website deleted
after threats were telephoned to my church.

Michael A. Terrell
Central Florida