I'm going to have to look again. I did swap the VR tube.
Something Garey mentioned made me check the T-4XB schematic. If that
schematic is accurate, Drake put the filter inside the PTO at some point or
just for the T-4XB. I'm suspecting this was done for all PTO's at some
point, as I couldn't imagine Drake building different versions of the PTO at
the same time (of course, not everything follows what I or anyone else would
consider logical...). This could allow me to try temporarily bypassing the
filter board. I did notice that shielded cable went directly to the PTO
when I removed it. Given these differences, it also looks like I'll be
ripping the receiver apart (again!) to put the original PTO back in.
Arrrggggghhhhh...
Steve Wedge, W1ES/4
"I can't complain, but sometimes I still do."
- Joe Walsh
If the above message appears, it came from Steve's Son of Laptop!
----- Original Message -----
From: <[email protected]>
To: <[email protected]>
Sent: Sunday, August 21, 2011 6:11 PM
Subject: Re: [Drakelist] You just know I'm not going to have any hair
left...
Did you put a scope on the voltage to the PTO and watch it carefully?
As it fails?
73,
Lee, KC9CDT
-----Original Message-----
From: Steve Wedge <[email protected]>
To: Eddy Swynar <[email protected]>
Cc: drakelist <[email protected]>
Sent: Sun, Aug 21, 2011 5:30 pm
Subject: Re: [Drakelist] You just know I'm not going to have any hair
left...
That's the thing: it's a different PTO that was working properly before
I transplanted it.
Looks like I've got to try replacing the components on the filter
board. Something is pulling the frequency...
Steve Wedge, W1ES/4
"I can't complain, but sometimes I still do."
- Joe Walsh
If the above message appears, it came from Steve's Son of Laptop!
----- Original Message -----
From: Eddy Swynar
To: Steve Wedge
Cc: [email protected]
Sent: Sunday, August 21, 2011 5:16 PM
Subject: Re: [Drakelist] You just know I'm not going to have any hair
left...
Hi Steve,
Well, I'm almost hesitant to say this, but ever since I re-soldered
that connection of the 33-pfd. temperature compensating tubular
capacitor in the PTO of my T-4X transmitter, I have not---FINGERS
CROSSED!---experienced anymore warbling of my signal...
...In fact, I just checked it again a couple of hours ago. Still sounds
A-OK.
Now, that is NOT to say that the situation is 100% cured---I know
better than to publicly proclaim anything like that, having been
"burned" so many times in the past! Hi Hi.
Best get that ailing PTO into a mailing container & ship it POSTE HASTE
to Garey first-thing Monday morning, for his evaluation of the doggone
thing (and to think that I once thought that only my old Heathkit
SB-102 was the proverbial "...rig from hell"!). : >)
~73~ de Eddy VE3CUI - VE3XZ
*************************************************************************
*******************************************
On 2011-08-21, at 4:57 PM, Steve Wedge wrote:
Turned the R-4A on, with the replacement PTO from the T-4XB, and I am
back to square one. :-(
The frequency is jumping all over, occasionally chirps, then un-chirps.
Any suggestions aside from selling it cheap?
Steve Wedge, W1ES/4
"I can't complain, but sometimes I still do."
- Joe Walsh
If the above message appears, it came from Steve's Son of Laptop!
_______________________________________________
Drakelist mailing list
[email protected]
http://mailman.zerobeat.net/mailman/listinfo/drakelist
_______________________________________________
Drakelist mailing list
[email protected]
http://mailman.zerobeat.net/mailman/listinfo/drakelist
_______________________________________________
Drakelist mailing list
[email protected]
http://mailman.zerobeat.net/mailman/listinfo/drakelist
