RE: [drakelist] T4XC and TR7

[Frank Woolfe]

Gang,
 
Thanks for assistance on T4XC appears the meters are 
very sluggish, I will have a look at the output with a scope and go from 
there
 
Another question, having a look at a TR7 early S/n 
"44XX" fitted with FA7 fan, 1.8Khz SSB, 6Khz AM, 500Hz CW Filters, NB7 
Blanker and 7077 Mike also has RV7 VFO and PS75 PSU, extender cards and 
original manuals looks in really nice clean and tidy condition any idea of 
what the line up would be worth??
 
Regards,
 
Frank VK5MFW

Re: [drakelist] Date: Tue, 11 Jul 2006 06:19:35 +0930

[Garey Barrell]

Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Frank -

IF you are seeing 500 mA of plate current, you'll probably find that the 
meter shunt resistor has gone up in value.  It's the 3.3 ohm, 1/2 W 
resistor on the relay board under the chassis.  The problem is that this 
same meter is used to set the 100 mA idling plate current of the finals, 
and if the meter is reading incorrectly, the bias is also set 
incorrectly, affecting the linearity of the transmitter.  While you're 
in there, it's also a good idea to check the 15 ohm, 1W cathode 
resistors for the finals.  They also change value with age and should be 
matched within 5% of each other for best linearity.


The TUNE signal is developed by converting the Mic input stage to an 
oscillator, so there isn't much different between the TUNE and AF signal 
path.   What microphone are you using?   It  _must_  be a Hi-Z mic, such 
as a crystal or ceramic.  A dynamic mic will usually require a step-up 
transformer, sometimes internal and switchable on the mic stand.  A 
steady whistle into the mic should produce the same output power as the 
TUNE mode.  If not, I'd suspect the mic (correct Z?) or wiring.  With 
normal speech, about one half the max plate current   _as read on the 
meter_  is about right.   A scope (or peak-reading wattmeter) would show 
that the true peaks are at the max power level as TUNE.


73, Garey - K4OAH
Atlanta

Drake 2-B, 4-B & C-Line Service Data




Frank Woolfe wrote:

Gang
Have recently replaced output tubes in my T4XC, I can obtain a tune 
carrier of over 150/180watts with max tune gain around 
500ma Ic however can only obtain around 50watts on voice peaks on 
20/40m around 250ma Ic, I would expect to see the same amount of 
output power on voice as carrier, is there something I have missed or 
should be replacing also?
 
Frank VK5MFW

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Re: [drakelist] Date: Tue, 11 Jul 2006 06:19:35 +0930

[Jim Shorney]

"Jim Shorney" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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On Mon, 10 Jul 2006 15:49:10 -0500, Frank Woolfe wrote:

>Have recently replaced output tubes in my T4XC, I can obtain a tune carrier of 
>over 150/180watts with max tune gain around 500ma Ic however can only obtain 
>around 50watts on voice peaks on 20/40m around 250ma Ic, I would expect to see 
>the same amount of output power on voice as carrier, is there something I have 
>missed or should be replacing also?


Depends on the duty cycle of your voice. These radios have no speech
processing or compression in them at all, so that could be about right. What
can you "whistle it up" to? The only way to be sure is to look at the output
on a scope. With my voice, I typically see 20-30 watts on voice peaks with no
processing for 100 watts PEP output on any unprocessed radio.


73

-Jim


--
TR7/RV7, TR6/RV6, T4XC/R4C, L4B, NCL2000, SB104A, R390A, GT550A/RV550A - all 
vintage, all the time!


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RE: [drakelist] T4X mic wiring question

[Jim Shorney]

"Jim Shorney" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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On Mon, 10 Jul 2006 17:53:39 -0400, Gerry wrote:

>There is no standard among microphone manufacturers. They sometimes change
>color codes to suit the lowest priced cord vendor and they also make
>mistakes.

True, but there are certian brands/models of (mostly vintage American made)
mics that do follow the red=PTT, white=audio, shield=audio ground, and
black=PTT return format. It is best to verify visually or with an ohm-eater
though.


--
TR7/RV7, TR6/RV6, T4XC/R4C, L4B, NCL2000, SB104A, R390A, GT550A/RV550A - all 
vintage, all the time!


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[drakelist] OT: Mosley PRO57 manual

[Jim Shorney]

"Jim Shorney" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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You guys seem to have just about everything. Anyone got a copy of the PRO57
manual that I can beg?

73

-Jim


-- 
Jim Shorney  -->.<--Put complaints in this box
jshorney (at) inebraska.com
Ham Radio NU0C
Lincoln, NE, USA
EN10ps
http://incolor.inetnebr.com/jshorney/

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Re: [drakelist] FS Drake LP filter and Electic Radio mags

[Ron Wagner]

Ron Wagner <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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ER mags spoken for, and LOTS of other who want them.  Sorry.  If the first 
person fails to follow through I will go to the next e-mail in line.


TNX es 73,
Ron
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[drakelist] 2-B CD from Garey, K4OAH

[Gerry]

"Gerry" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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A great piece of work. Very thorough. Anyone contemplating
servicing/repairing or just curious about this neat receiver should spring
for the eighteen bucks and get it. It's everything Garey says it is and
more.

Gerry 



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RE: [drakelist] T4X mic wiring question

[Gerry]

"Gerry" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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There is no standard among microphone manufacturers. They sometimes change
color codes to suit the lowest priced cord vendor and they also make
mistakes. Obviously, they don't go out and buy a sample of every rig made so
they take educated guesses and they are sometimes wrong. This is why it's
not good to rely on a formulaic approach: green goes here, blue goes there,
etc. Far better to look at the function of each wire and then decide. The
T-4XC wiring is about the simplest thing there is. Only 2 wires and a
ground. Obviously one of the pins is PTT and the other must be the mic. The
problem occurs in the variety of microphones and the color codes involved.
Opening the mic and looking at the switch functions and the color wires
attached reveals all.

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Richard Loken
Sent: Sunday, July 09, 2006 5:31 PM
To: [EMAIL PROTECTED]
Cc: drakelist@www.zerobeat.net
Subject: Re: [drakelist] T4X mic wiring question


Richard Loken <[EMAIL PROTECTED]> made an utterance to the
drakelist gang
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On Tue, 4 Jul 2006 [EMAIL PROTECTED] wrote:

>Red - tip
>White - sleeve (middle)
>black + braid - body

>From my days at the phone company, should that not be:

Red   - tip
White - ring
black + braid - sleeve

Am I wrong?

-- 
   Richard Loken VE6BSV, Systems Programmer - VMS  : "Anybody can be a
father
   Athabasca University:  but you have to earn 
   Athabasca, Alberta Canada   :  the title of 'daddy'"
   ** [EMAIL PROTECTED] ** :  - Lynn Johnston

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Re: [drakelist] Substitution Filter Upper Low of TR4-c

[Tom Evans, AG9X]

"Tom Evans, AG9X" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Alignment instructions from TR-4C manual at
http://www.dproducts.be/drake_Museum/TR4.pdf

5-9  9.0 MHz Oscillator
a. Let TR-4C warm up for 30 minutes
b. Set MODE (FUNCTION) switch to SSB position.
c. Turn up the AUDIO GAIN control until noise is audible in the speaker.
d. While switching the SIDEBAND knob back and forth, adjust C130
until the pitch of the noise is the same in both positions.  C130 is
located on the top of the chassis near the rear edge.


or see
http://www.boatanchors.org/TR4.htm

or see
http://www.wb4hfn.com/DRAKE/DrakeManuals/TR4/Manual_TR4.htm

73,
-Tom, AG9X

On 7/10/06, Frank <[EMAIL PROTECTED]> wrote:


Frank <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Good morning
I have to replace the two filters Upper and low with 9
Mhzes of the TR4-C.
The two filters that I replace are already identical
to those installed.
I desire to have information for alignment procedure.
Thank you at all for collaboaration 73
Fed


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[drakelist] Date: Tue, 11 Jul 2006 06:19:35 +0930

[Frank Woolfe]

Gang
Have recently replaced output tubes in my T4XC, I can 
obtain a tune carrier of over 150/180watts with max tune gain around 
500ma Ic however can only obtain around 50watts on voice peaks on 
20/40m around 250ma Ic, I would expect to see the same amount of output power on 
voice as carrier, is there something I have missed or should be replacing 
also?
 
Frank VK5MFW

[drakelist] FS Drake LP filter and Electic Radio mags

[Ron Wagner]

Ron Wagner <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Cleaning up the shack a bit.

Drake TV-1000-LP Low pass filter
This is the copper filter that can be used at lower power on 6 meters. 
1000W below 30 Mhz.  $25 plus shipping from 45383


Electric Radio magazines
Whole years: 1993, 1997, 1998, 2002, 2003
Jan and Feb 2005
$10 for all plus shipping from 45383

TNX es 73,
Ron WD8SBB
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[drakelist] Substitution Filter Upper Low of TR4-c

[Frank]

Frank <[EMAIL PROTECTED]> made an utterance to the drakelist gang
--
Good morning  
I have to replace the two filters Upper and low with 9
Mhzes of the TR4-C.  
The two filters that I replace are already identical
to those installed.  
I desire to have information for alignment procedure.
Thank you at all for collaboaration 73 
Fed

Chiacchiera con i tuoi amici in tempo reale! 
 http://it.yahoo.com/mail_it/foot/*http://it.messenger.yahoo.com 
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