I once fed my R-4A (the 11 tube version) a premix signal from a stable modern
signal source to see exactly that. I don't know which, but the BFO and/or the
5995 Kc LO was drifting at least couple of hundred Hz over the testing period.
I personally do not care too much about the PTO drifting as
Just to clarify, early TR-3's don't have the lamp.
Kihwal, K9SUL
- Original Message
From: Garey Barrell k4...@mindspring.com
To: Bob W7AVK ro...@accima.com
Cc: drakelist@zerobeat.net
Sent: Sun, October 16, 2011 11:08:01 AM
Subject: Re: [Drakelist] Receiver protection lamp
Bob -
I've
Richard,
Congratulations and thanks for sharing! I learned a lot.
I've had two TR-4C's and the both had the similar problem caused by bad relays
and the bulb/socket in the RX ant.
Kihwal, K9SUL
From: Donley donley...@comcast.net
To: k4...@mindspring.com
Cc:
Richard II,
Begin with a quick check to eliminate one variable. Verify the tubes are indeed
6JB6.
I once managed to causeoscillation at 40 with 12GJ5's in a TR-3.
Kihwal, K9SUL
- Original Message -
From: Richard Knoppow 1oldle...@ix.netcom.com
To: Donley donley...@comcast.net;
Richard,
I think you need to find the cause of the low voltage (230V vs. 250-260V) and
fix that first.
The meter circuit does not change by switching the sideband. As Garey said it's
only
job is to choose the filter and the lamp.
The low screen voltage will certainly affect the plate current.
that will cause the PA Cathodes to read the correct
near zero reading rather than the 156 VDC he measured. The PLATE meter should
then read correctly. We'll see! :-)
I'm now thinking the problem is in the VOX circuitry.
73, Garey - K4OAH
Glen Allen, VA
Kihwal Lee wrote:
Richard,
I think
Replacing filters and using different set of filters for T/R. They are all
possible if you have right parts and do some electrical/mechanical mod. But
why would you do that? The filters in TR-4 are not very narrow/sharp anyways.
If you want to change the TX audio, try doing something on mic
: [Drakelist] sub for 1n625
Kihwal -
Most any switching diode will work here. Easiest to find is a1N4148/1N914, I
think Radio Shack even
has them.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
www.k4oah.com
Kihwal Lee wrote:
Hi,
I have
Hi,
I have a bad 1n625 (along with other things) in the antivox of my TR-3. I would
appreciate if someone ccould tell me what I can use as subs.
Thanks,
Kihwal, K9SUL
___
Drakelist mailing list
Drakelist@zerobeat.net
545c must be a ceramic mic, which should work fine with TR-4. (c for ceramic, x
for xtal) A battery powered electret will work too.
On Jun 21, 2011, at 9:49 AM, mail.speedy.com.ar lw3...@speedy.com.ar wrote:
Hi
Im purchased a Very Good Condition TR4 Series 26000.
I have a problem
Paul,
Would you mind giving more details about how the antivox output is connected in
your R-4B audio mod? I might do something similar to an R-4A.
Thanks,
Kihwal, K9SUL
From: Paul Christensen w...@arrl.net
To: drakelist@zerobeat.net
Sent: Thursday, June 16,
Hi Dale,
I once connected a DDS directly to my R-4A's fixed freq crystal connector on
the side, replacing the premix signal (band xtal + VFO). You just need to
inject 5645 KHz (IF) + desired frequency. The DDS had an option to set any
arbitrary offset for display (-5645 in this case), so it
/ham/pto_broken_wire.jpg
Kihwal, K9SUL (ex-HL1SUL)
- Original Message -
From: Kihwal Lee kih...@yahoo.com
To: k4...@mindspring.com k4...@mindspring.com; drakelist
Drakelist@zerobeat.net
Cc:
Sent: Monday, May 9, 2011 12:46 PM
Subject: Re: [Drakelist] R-4A PTO
Hi Garey,
Thanks
.
The important reading here is the Base to be about 0.6 V above the Emitter. If
this is true, the transistor is almost certainly ok.
Let us know what you find!!
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
www.k4oah.com
Kihwal Lee wrote
It's inside the T6 can.
Kihwal, K9SUL
From: Neil M Califano cchange...@yahoo.com
To: Drakelist@zerobeat.net
Sent: Tuesday, April 26, 2011 10:21 PM
Subject: [Drakelist] R4A filter location
Where physically in the R4A is the crystal lattice filter?
My TR-4C's s-meter points to S-9 under no signal condition. Adjusting the
sensitivity and the zero pot won't correct it. I also noticed its reduced
sensitivity compared to other Drakes that I have. The s-meter moves as expected
when RF gain is lowered. Checked/replaced all tubes. I also checked
:
Kihwal -
Check Pin 2 of V17 for resistance to ground (270 Ohms) and voltage ~7.5 VDC.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
www.k4oah.com
Kihwal Lee wrote:
My TR-4C's s-meter points to S-9 under no signal
number
I am gladto learn about the T-4 reciter's serial numbers. Mine is 0018 and
Ihad it converted to a T-4X when I sent the unit in for arepair.
- Original Message -
From: KihwalLee kih...@yahoo.com
To:drakelist@zerobeat.net
Sent: Tuesday, March 15, 2011 4:22PM
This is from Bill Frost about the special edition T-4X.
Kihwal K9SUL
- Original Message
From: Bill Frost wd8...@yahoo.com
To: Kihwal Lee kih...@yahoo.com
Sent: Mon, March 14, 2011 11:57:02 AM
Subject: Re: [Drakelist] Strange serial number
Hello Kihwal,
If memory serves, I believe
Dear Fellow Drake Addicts,
I have come across a T-4X, which appears to be one of the latest of its kind.
From the lower side, it looks exactly like T-4XB, but the filters are grey
T-4X
filters. The final cage is also black and the front panel is of regular T-4X,
except for the main tuning
Hi Gary,
Yup. It could have been installed by the owner. But being very near the end of
the T-4X production run and based on the fact that it was converted from T-4
to
T-4X right before the introduction of T-4XB, I wouldn't be surprised even if
some of T-4XB parts were used in the
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