VHF GE MDX Mobile radio - Any Interest

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Tom/G, N1VVD
Posts: 12
Joined: Wed May 04, 2005 12:48 pm
Location: Newington, CT

VHF GE MDX Mobile radio - Any Interest

Post by Tom/G, N1VVD » Wed May 24, 2006 9:55 am

I figured I would post this out here to see if there was any interest.
My GE MDX has not been hearing to well lately so based on some recommendations, I replaced the first RF transistor so see if that would help it out. Unfortunately, it did not help.
The radio transmits fine, but doesn't receive as well as it should.
I can hear the NOAA weather broadcasts fine, my main HAM repeaters are received on the weak side.
I am pulling it out of the car for now but I was wondering if there was any interest here in people wanting to buy it.
It is a VHF 150 to 170MHz split, but worked well in the HAM bands.
It is a more rare 128 channel radio, remote head, 50 watts.
Let me know if you would be interested in buying the radio, as is.
Thanks, Tom/G, N1VVD - n1vvd@snet.net

kk6rq
Posts: 36
Joined: Sat May 01, 2004 3:07 am
Location: Mt. View CA

Deaf MDX

Post by kk6rq » Sun May 28, 2006 8:05 pm

I'll bet you a dozen donuts that the one or more of the T/R diodes are
blown. I've had the EXACT same symptoms on several Spectras and,
obviously not the same radio, but I'm assuming anything new enough not to have a relay has them. Looking forward to donuts.

Tom/G, N1VVD
Posts: 12
Joined: Wed May 04, 2005 12:48 pm
Location: Newington, CT

Donuts anyone........

Post by Tom/G, N1VVD » Tue May 30, 2006 9:11 am

kk6rg,
I would gladly buy the the donuts, although they might be stale but the time that got from CT to CA... :)

The next thing I was going to try was the switching diodes.
The service manual lists them as PIN diodes and if I look them up they look like the old discreet component diodes.
If I open up the radio and find them, they are surface mount diodes and are very very small......... :(

Thats kind of where I left it. I put my Kenwood HAM radio in the car and pulled the MDX out.
Maybe that will be the next project if I can find the diodes....
Thanks and 73, Tom/G, N1VVD

kk6rq
Posts: 36
Joined: Sat May 01, 2004 3:07 am
Location: Mt. View CA

diode city

Post by kk6rq » Tue May 30, 2006 10:00 pm

Of course one could always use discreet (leaded) components, if only to
test. If they fit without danger of shorting I doubt there'd be any problem using them permanently.

And stale donuts can always be dipped in coffee w/o the recipient being any
the wiser....

Tom/G, N1VVD
Posts: 12
Joined: Wed May 04, 2005 12:48 pm
Location: Newington, CT

Post by Tom/G, N1VVD » Wed May 31, 2006 8:44 pm

Yup,
I may try that...
I need to work up my confidence with the soldering iron for that.
Thanks,,,,, Tom/G

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