Richard -
I hate losing all our previous information on this message... My fault. Just
keep the other one.
Adjusting the BIAS control while measuring the voltage across each of the Cathode resistors is ok,
but you also need to measure the resistors, preferably with a DMM. Even one ohm
I have had two separate issues with this switch. Deoxit and working back and
forth a few times solved it.
73
Mark
N5KAE___
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Donley wrote:
Completed tasks.
Adjusted bias control until 0.5 VDC across cathode resistor, equals 33
mA, three resistors in parallel equals 100 mA total bias current. Bias
voltage is -55 VDC at this point. No bias current measurement on plate
current meter (actually has been just a slight
- Original Message -
From: Curt Nixon cptc...@flash.net
To: Donley donley...@comcast.net
Cc: Richard Knoppow 1oldle...@ix.netcom.com;
k4...@mindspring.com; drakelist Drakelist@zerobeat.net
Sent: Wednesday, July 13, 2011 9:43 AM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
At
Curt Nixon wrote:
Donley wrote:
Completed tasks.
Adjusted bias control until 0.5 VDC across cathode resistor, equals 33 mA, three resistors in
parallel equals 100 mA total bias current. Bias voltage is -55 VDC at this point. No bias current
measurement on plate current meter (actually has
Mark -
Yes, they do develop oxidized contacts. However in this case that type of failure would not present
as being 'stuck' in one position.
When Richard checks the items in my last message we'll have a pretty good idea
what's happening!
Thanks for contributing!
73, Garey - K4OAH
Glen
Richard Knoppow wrote:
- Original Message - From: Garey Barrell k4...@mindspring.com
To: drakelist Drakelist@zerobeat.net
Sent: Wednesday, July 13, 2011 6:19 AM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
Richard -
I don't recall a C73 reference.? Possibly C74, which is the
Garey Barrell wrote:
Richard Knoppow wrote:
- Original Message - From: Garey Barrell
k4...@mindspring.com
To: drakelist Drakelist@zerobeat.net
Sent: Wednesday, July 13, 2011 6:19 AM
Subject: Re: [Drakelist] TR-4C Bias Adjustment
Richard -
I don't recall a C73 reference.?
I pulled the pto out and removed the cover (of course, this meant pretty much
disassembling down to the chassis to get it out!).
There was no zener inside -it had been clipped out. I couldn't find any
obvious bad parts using a stereo microscope, so I re-flowed the solder on the
board wherever
Hi Steve:
THe PTO that I have worked on have a diamond shaped hole in the coil end
coverfor the back end of the brass shaft and are not tight at all.
Shaft just kind of rides there. However, ANY slight movement of that
end will cause a frequency abberation. If there is any type of build up
Will the R4 series tune medium wave(1-1.5 Mhz)with the appropriate crystal?
There is a close band setting for 1.5-3.0 and the preselector seems tune that
low. Signals in this range are very strong after all. I don't want to buy an
expensive 1.0 Mhz crystal and discover it won't work. Thanks.
Garey , Richard I, et al
Since I am the student here, I can only be Richard II.
I measured the resistance of R45, in circuit with the relay pulled. I'm not
sure that made any difference. It measured 2.4 ohms on a Fluke 179.
Since it is difficult to adjust for MAX or MIN on a DMM, I changed
Someone was wondering why they hadn't heard a report yet :)
I got my pictures from our K0KKV Field Day into the hands of the web admin
tonight, and they are up here:
http://k0kkv.org/gallery/index.php/Club-Events-and-Activities/Field-Day/Field-Day-2011
Featured prominently in several
Years ago, I participated in a Field Day, back when the Kenwood TS940 was
fairly new. The Kenwood was to be our primary rig and I brought my old
TR7, more as an afterthought, to be a back up rig.
As you might guess, the Kenwood had trouble and we ended up operating the
entire weekend on
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