[Hammarlund] HX-50 Progress

[Al Parker]

Good AM Bob,
	Yes, Jack, W0YJ, is a good man, he's helped me out before.
	I can't find anything published on PTT mods for the HX-50, but the 
manual indicates that it was provided for at the rear accessory terminal 
strip, pins 1 (gnd) and 2 (PTT).  It should be a simple job to run a 
wire from pin 2 to a new 2-circuit mike jack with the added contact. 
Perhaps your prev. owner did connect a new wire, from the mike jack to 
either the function switch S104A(front) or to that end of R104, which is 
off the cathode of V107b, then for some reason disconnected (or cut) the 
existing wire from the function switch to the rear terminal strip's pin 2.
	I hope this is of some help.
73,

Al, W8UT
www.boatanchors.org
www.hammarlund.info

"There is nothing -- absolutely nothing -- half so much
worth doing as simply messing about in boats"
Ratty, to Mole

On 6/10/2014 11:07 PM, Robert Sauvan wrote:
> Well,
> We are making some nice progress on the HX-50. I have removed the
> cluster of resistors and diodes that were bugging me so much and have
> now replaced them with new diodes only and it is working just fine. It
> looks so much cleaner under the chassis now. I seemed to have eliminated
> the chirp which started all of this. Not sure if it was the couple of
> resistors I replaced or one or more of the electrolytics I replaced.
> Regardless, I dont see it on the scope or hear it in a remote receiver.
> So, the next real test would be to put it on the air. I used to get
> really bad chirp reports. I am getting just a bit of ripple on my scope
> that I believe is coming from my can electrolytics. I have been told
> that I can just take a new electrolytic and put it across the old one
> and test it to see if my ripple goes away. Apparently the ripple I am
> seeing is pretty small and probably doesnt show up on my signal. Maybe
> someone could expand on that for me. I only have 3 items left to
> explore. The mysterious cut wire that was supposed to be connected to
> the PTT terminals on the back of the radio, a resistor that has been put
> in parallel with another, and I dont seem to find it in the schematic,
> and a variable cap that is also seemingly put on by someone else. Havent
> looked into thjs one yet.
>
> The PTT circuit is next. I have been sent numerous mods from 2 sources
> and after reading through them, my radio doesnt appear to have any of
> these modifications done to it. Al, W8UT is looking into finding some
> type of PTT mod that he recalls so maybe that is what I am looking at in
> my radio. If he is unable to find it I guess Im on my own to figure out
> why this wire has been cut and no longer in use. Jack, W0YJ was able to
> tell me where the wire went originally. He was up until midnight last
> night tracing the darn thing on his HX-50 since I was unable to tell
> where it started and stopped. He's a good man I say. There is now a new
> wire in its place going to a terminal strip with numerous resistors and
> wires connected to it. Need to figure this all out.
>
> Everyones advise and tips have been paying off. Many thanks, and I hope
> to get this thing back to square one even though it is working just fine
> for now. Will keep everyone up to speed.
>
> 73-Bob-W0YBS