The pass band tuner on my R4A grinds a little when I turn it for about 20% of
the 360 degree range. Any idea what is wrong? Typically this happens after a
lot of use.
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I sent the OEM 13.695 MHz xtal into ICM and asked that they duplicate the
operating characteristics. The xtal I received from them will operate on 13.695
MHz but is unable to be pulled the necessary +/- 3 KHz in the VCXO circuit. I
can only get +/- 1.7 Khz, not enough.
Bottom line: ICM xtals
This assembly can be taken apart and is fairly easy. The grease in your PBT
is probably all dried-out. You'll need to unsolder the box at the rear,
remove the screws and then pull the slug rack straight back (after removing
the knob on the front, of course). I've had lithium grease
The standby mode on the R4A isn't really electrically standby is it? It seems
to be only an audio muting.
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I need a 39.1 Mhz xtal for 10 meters CW (1 or 2)
I have the following excess to my needs:
1.5 Mhz
14.1 Mhz
15.4 Mhz
15.6 Mhz
Trade - swap or Buy the 10 meter CW xtal
73 Gary K7OX___
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I always assumed it was as if it was muted. I believe you still have all
the plate and screen voltages.
Steve Wedge, W1ES/4
To be is to do - Socrates
To do is to be - Plato
Do be do be do. - Sinatra
All my computers have my signature with various pearls of wisdom appended
thereto.
Hi All,
I am in the process of restoring one of those R-4B radios that were offered on
this list. I have never owned an R-4B and I have a couple of questions:
First of all, I have the receiver 95% operational.
1) I am used to the S meter on other radios going to full scale when RF gain is
The AVC bus is allowed to float to maximum, effectively cutting off all
AVC controlled stages.
The front panel FUNCTION switch must be on ON, NB or CAL for the
external mute to take effect.
--
73, Garey - K4OAH
St Charles, IL
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service
What is the range in khz of the R4A passband tuner? Is there a range in khz
like a fine tuning?
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I just acquired another small pile of Drake gear from a friend. He gave the
rest to me in exchange for cleaning and aligning the T-4X and returning it with
PS. Included with the gear was a TR-3 in pretty rough shape - not sure what
I'll do with this aside from part it out. There are,
On Sat, 29 Oct 2011 06:18:47 -0600, Ron Ries wrote:
I sent the OEM 13.695 MHz xtal into ICM and asked that they duplicate the
operating characteristics. The xtal I received from them will operate on
13.695 MHz but is unable to be pulled the necessary +/- 3 KHz in the VCXO
circuit. I can only
Hanks to Curt, KU8L, I have received the MC4016P chips. BGMicro had a
zillion of them. Put one in place of the bad one and still no joy. It is
locking up on a different frequency. Note the test was after I tried a good
divider board from the other unit and it worked fine.
So, does anyone
On Sat, 29 Oct 2011 20:04:23 -0400, Steve Wedge wrote:
The main question is this: what's the major difference between the AC-3 and
the AC-4? Is it strictly the parts locations and the absence of the VOX RLY
connector?
See the thread here:
Jim,
They had a schematic, a crystal with which they took all the important
measurements, knew it was in a VCXO circuit with all the expected performance
specs and we had at least 10 telephone conversations discussing the obvious
problems. Still didn't turn out like the OEM xtal. I have
Sounds like you covered all the bases. I hope someone doesn't have to send them
a whole radio.
73
-Jim
On Sat, 29 Oct 2011 18:18:59 -0600, Ron Ries wrote:
Jim,
They had a schematic, a crystal with which they took all the important
measurements, knew it was in a VCXO circuit with all the
Sorry if this is a duplicate email. I had a bit of trouble with my Outlook
today.
I'm restoring a 2B s/n 11222. It's in very good condition except someone
drilled a small hole in the faceplate, not sure for what reason, to the
right of the AF Gain knob. The plate is in great condition,
TNX, Jim. Shoulda known someone else would've brought it up by now.
I've just been given an AC-3; I assumed it would play with all the 4-line,
so it's a nice gift indeed.
The MS-3's a nice bonus. I'm thinking the TR-3 is a basket case, though.
Definitely worth it if any of the tubes are
And based on the AC3, there is a test point which is normally tied to ground.
When you lift it from ground, you measure voltage drop across a resistor. This
voltage happens to directly relate to final current. This allows you to easily
adjust the bias w/o trying to figure out how accurate
After receiving good audio reports for a year or so on the B line,
suddenly am getting poor audio reports on the T4XB. Listening to the
audio on the R4B with the mute off it sounds almost 'OK' and I would
think it was just overload into the R4 not really hum or RF on the
audio but more like
Steve,
If I remember correctly, the finals in the TR3 are 12JB6's, not 6JB6's so
not compatible with the T4(any). My memory isn't what it used to be, but
that's what comes through the fog. There's also no cover over the top of
the power supply. If you use the Heathkit Shop's board, download
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