[Hammarlund] HX-50 problem cropping up

[Robert Sauvan]

Hi Bill,
I did get some replies back and good bit of help as well. But, have not 
been able to find the problem yet. I am having some serious relay issues 
pulling in when they shouldnt. In the midst of it all I have now found 
that I no longer have any power output so it seems another issue has 
popped up. I am going to try to find out why I dont have power anymore 
and then back to the original problem I hope. Will keep everyone 
informed of the progress.

Thanks-Bob-W0YBS


On 1/13/2015 3:29 PM, Bill Stewart wrote:
> Hi Bob,
> I didn't see any replies to your questions.
> Sorry, but no good suggestions. I did want to let you
> know that I am also having a problem with the VOX
> system. On my HX-50, MOX and SSB VOX work ok, but
> on CW VOX, at the tap of the key the relays pull in,
> but will not unkey...no matter where the delay is
> set. I can manually unkey the relays by prying the
> contacts up...but seems to only take very slight
> pressure to do this...not like when they are pulled
> in, say in MOX. Do you know how the VOX delay for CW
> works...components, etc? I was thinking that R-149B
> and the .22uf (C239)formed a RC timing ckt to control
> the delay. There seems to be more to it than that...I'm
> having trouble following the schem. thru all the wafer
> switches...hi. Good luck with your HX-50. If you find a
> fix for your problems, please pass it along...I would be
> very interested. The tone on mine has not sounded very
> good, but with changing a few tubes, it sounds a bit
> better...but not as good as I would think a $500 xmtr
> would have sounded when it was new.
>
> 73 de Bill K4JYS
>
> ----- Original Message -----
> From: "Robert Sauvan" <rsauvan at beyondbb.com>
> To: "Hammarlund Mail List" <hammarlund at mailman.qth.net>
> Sent: Thursday, January 8, 2015 9:57:45 PM
> Subject: [Hammarlund] HX-50 problem cropping up
>
> Hi all,
> As you may remember, I just replaced my electrolytics and the power
> transformer in an attempt to resolve the chirping issue in my HX-50.
> This was back in June and the radio has been working fine ever since
> until just the other day. I now have a new problem. When I turn on the
> radio now, I leave it it "standby" until I am ready to transmit. But,
> now when I put it in "Mox" or "Vox" it goes into transmit and shows
> power output on my power meter. The key seems to be ineffective. I do
> not use a microphone. I have it on the workbench and noticed a couple of
> times some sparking at the relays K101/102. I cleaned the relays well
> again but no change. I also notice that the contacts on the relay are
> floating. No change when I put it in mox or vox. I am assuming, but
> shouldnt the relays be closed at some point? Either sitting at idle and
> then when it is either keyed or put in vox, they should click into
> another position? Any ideas where I might start looking? Im wondering if
> the relays are bad. I have tapped them a couple of times thinking they
> may be hanging up but that doesnt seem to have any effect. Any
> suggestions would be great.
>
> Thanks-Bob-W0YBS
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