[Heathkit] HW-101 stuck in TX on CW

[Alex]

Hi Bob,

Thanks for your suggestions! It wasn't the VOX or the relay this time. I
just found the problem. After chasing the problem in the rig for quite some
time, I found that the problem was actually in the power supply (HP-23C), in
the bias voltage circuit. One of the 40uF/150V capacitor was bad. After
replacing it with two caps from broken CFL bulbs everything worked fine
again.

73,
--Alex KR1ST


-----Original Message-----
From: Bwana Bob [mailto:wb2vuf at verizon.net] 
Sent: Saturday, January 04, 2014 2:34 PM
To: alex at kr1st.com; heathkit at mailman.qth.net
Subject: Re: [Heathkit] HW-101 stuck in TX on CW

I had a similar problem in the past with my HW-100. It turned out that the
VOX controls were mis-adjusted. The anti-trip was set too high, which
required a high setting for the vox sensitivity control. The result was that
the VOX  would hang up or oscillate.  You might also check for a sticking
relay.

             73,

             Bob WB2VUF


On 1/1/2014 2:12 PM, Alex wrote:
> First of all, Happy New Year!
>
> I just unpacked the HW-101 after it was in (climate controlled) 
> storage for two years hoping to use it for Straight Key Night. 
> Everything seems to be working fine, except that it gets stuck in 
> transmit in CW when I engage the CW key. I can also hear the side 
> tone, although at a lower volume, when the key is not depressed. When 
> I key down the side tone is at a normal level and I get full output 
> power. There is no power out when I let up the key. It seems as if the 
> vox is constantly engaged. To get the rig into RX I have to switch 
> modes. I guess that's because the tone oscillator shuts down and cannot
engage the vox anymore.
>
> I checked the vox delay and anti-trip works fine on the sideband 
> modes, so it seems that the vox circuit is fine.
>
> Has anyone encountered this problem before, and perhaps know of a fix?
>
> 73,
> --Alex KR1ST
>
>
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