[Collins] Product detector for 75A-2 and 75A-3 Receivers

Glen Zook gzook at yahoo.com
Fri May 6 16:08:15 EDT 2005


There were actually a couple of different companies
that made product detectors for the 75A2 / 75A2A /
75A3.  You had to drill a hole under where the Collins
logo was.  However, if you ever had to remove the
adaptor you could put the logo back on and everything
looked "factory".

The reason for the hole was that the adaptor had its
own BFO (tunable) and you had to adjust the frequency
by a shaft that came out the front panel through the
hole.  The escutcheon was held on by screws going
through the two holes that the logo was originally
mounted.

I did not have one.  But, K9LHC had a 75A3 that had
the product detector added that he used for several
years.  As far as I know it did a great job.

You put the receiver in the "FM" position to receive
SSB or CW.

In the past I have made a solid-state product detector
using 2 germanium diodes and associated resistors and
capacitors for 2 different 75A2 receivers.  I brought
the BFO over to the NBFM socket and put the product
detector into a project box and plugged it into the
NBFM socket.  It worked very well as well as the
commercial types.

My present 75A3 has a Collins NBFM adaptor and my 75A2
has one of Howard Mill's product detectors. 
Therefore, I haven't had the need to build another
product detector for them.  I do have a Collins 51J2
that I might build a solid-state product detector for
some day.

Glen, K9STH


--- C Eus <catman351 at yahoo.com> wrote:

I think it was the Universal Radio product detector
adaptor. Sold several years ago (more like decades
ago). Collins insignia went off to expose some holes
where the controls could be mounted from what I gather.

Glen, K9STH

Web sites

http://home.comcast.net/~k9sth
http://home.comcast.net/~zcomco


		
Discover Yahoo! 
Use Yahoo! to plan a weekend, have fun online and more. Check it out! 
http://discover.yahoo.com/


More information about the Collins mailing list