Howard,
When rebuilding AC-4s I have used both discrete replacements for the caps,
resistors, and diodes as well as the Heathkit Shop AC-4R boards. The
boards are very good and the kit is easy to follow. Just take your time
and note where the original wires were connected. If you have a digita
Peter,
Check the manual again. You will see that 200W is the INPUT power.
Assume a realistic 60% efficiency and you get 120W.
Ken
WA2LBI
On Sat, Jan 21, 2012 at 07:18, Peter Ravn wrote:
> **
> Acccording to the factory specifications the T4XB should run 200 watts on
> all bands. My recent
Peter,
If you have verified continuity through the switch then look at the
schematic and you will see there is a 1N270 diode between the output meter
control pot and the antenna. If that diode is defective, missing, or has a
cold solder joint you will not get any reading.
Ken
WA2LBI
On Sun, J
I consider it like a bench power tool switch. You pull "ON" and push
"OFF". This is done so you can punch the switch in the event of a disaster
rather than having to carefully aim and grab. So to me, pulling to put the
amp on line and pushing to put into standby makes sense. OTOH, I like big,
e
Here are a couple examples that may also give you some ideas.
http://www.mcmelectronics.com/product/28-11161
http://www.mcmelectronics.com/product/28-11585
Ken
WA2LBI
On Tue, Jan 10, 2012 at 19:28, Garey Barrell wrote:
> Mark -
>
> Here's a suitable one. Rated at 15A, so should handle a cou
In addition to the "wooden stemmed tightly woven Q tips that are
made especially for electrical cleaning" mentioned by Dennis, AE6C, I also
use the brushes listed below. A drop of DeoxIT on either goes a long way.
These brushes are great for cleaning 7 & 9 pin tube sockets:
http://www.gumbrand.co
Lee,
Wire up a relay to act like a buzzer. That should generate some good
ignition-like sparking at the contacts.
Ken, WA2LBI
On Sun, Feb 6, 2011 at 02:00, wrote:
> Gang,
> I need to test the noise blanker in my R-4CIs there an easy way to test
> it?
> No ignition noise here, no electric
Paul,
Years ago I read all of the Drake mods and other available information
regarding the GUF-1 and the recommendation was to install the 8 kHz GUF-1.
I have one in my R-4C and it makes a significant difference with adjacent
channel rejection compared to the original factory filter.
Ken, WA2LBI
To All,
The R-4C noise blanker is effective depending on the type of noise. In my
case it handles the 20 over S9 raucous, pulsing hash generated by defective
street lights that try to restart every minute or so from dusk to dawn. It
is far less useful on other types of noise.
Ken, WA2LBI
On T
d of the KEY so the SIDETONE is NOT generated.
>
> This puts the Carrier Oscillator within the LSB passband so as to have a
> larger output to null.
>
>
> 73, Garey - K4OAH
> Glen Allen, VA
>
> Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs
>
>
>
&
Frank,
The carrier balance adjustment is made in SSB, not CW. See page 15 of the
T-4XB manual under "CARRIER BALANCE ADJUSTMENT".
Ken, WA2LBI
On Mon, Mar 22, 2010 at 09:42, iz oos wrote:
> Hi!
>
> I did my homework! Indeed, the carrier oscillator crystal frequency
> was not exactly set to 5
Curt,
See pages 15 and 16 in your T-4XB manual. It is the section labeled
"TRANSCEIVE ALIGNMENT".
Have fun!
Ken, WA2LBI
On Sun, Nov 8, 2009 at 12:59, Curt wrote:
> I had been using my T-4XB and R-4A in separate mode since buying them.
> Recently hooked up injection cable and tried "transmi
Yash,
Be sure the receiver is to to EXT MUTE.
Ken, WA2LBI
On Thu, Oct 29, 2009 at 12:04, wrote:
> Just set up my c-line,everthing worked fine Except .. when you key the
> transmitter ssb you hear yourself thru the speaker. Changed the mute
> cable just to be sure,problem still occurs. Rea
Frank,
INRAD sells new R-4C AM filters for either $110 or $120 USD. The asking
prices for any used filters I have seen for sale are usually in the same
vicinity or higher. I also need (want) an AM filter to complete the filter
selections in my R-4C. Considering the used prices I will buy a new
"Ken Winterling" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
--
According to Tom this supply also had an open 10K HV bleeder/load
resistor. Whatever caused it to fail may have caused the 220K
"Ken Winterling" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
--
Tom,
There is a 220K bleeder/load resistor, R8, across the medium B+, 250V,
supply to ground. If it is open the medium B+ will be
Happy holidays to all!
I have a T-4XC on the bench that has a drifting PTO. I am monitoring it
with a freq counter and it never settles down, even after hours on the
bench. The 11 VDC supply is stable. Have any of you folks run across this
and, if so, what was the cure?
Thanks,
Ken, WA2LBI
Rob,
The original feet for the AC-4, when used stand alone, had a 6-32 stud
projecting from a rubber "bumper" that protected the table top. These were
removed when the AC-4 was inserted in a MS-4 speaker cabinet. The feet were
then used to secure the AC-4 to the MS-4 cabinet which had its own f
"Ken Winterling" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
--
Dave,
Check the function switch on the R-4C. Be sure it is in the "EXT.
MUTE" position. That position allows the transm
"Ken Winterling" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
--
I am looking for an electronic copy of the latest version of the AC-4
power supply schematic that shows the wiring of the dual
Ken Winterling <[EMAIL PROTECTED]> made an utterance to the drakelist gang
--
Keith,
Here are two sites that may help. The PTO has an internal adjustment
screw for the ball bearing race. The first site describes the
pro
Ken Winterling <[EMAIL PROTECTED]> made an utterance to the drakelist gang
--
Keith,
Over the years I have used the following, listed in no particular
order, with "B" and "C" lines:
Shure 444D
Shure
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