Steve -
Don't forget that the S-Meter is a bridge that compares the current drawn by V2 and V3 with that
drawn by V4 and V5. So anything that alters these two currents _differently_ can cause what you
are seeing, usually 'weak' tubes. Of course ZERO drift is usually caused by gassy tubes, u
Bob -
The C-Line does fine for RTTY. The transmitter has a jack on the back panel marked RTTY that when
shorted shifts the carrier a bit to ensure that both tones (2125 - 2975 Hz 850 Hz shift,)were
passed through the LSB filter unattenuated. It was originally designed when we were still usi
On Wed, 4 Jan 2012 21:18:49 -0500, Steve Wedge wrote:
>Yeah, but Klinger had more style...
Ah, but Klinger stopped wearing dresses when he became company clerk.
73
-Jim (not a cross-dresser, just a modder)
--
Ham Radio NU0C
Lincoln, Nebraska, U.S.S.A.
TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, N
Yeah, but Klinger had more style...
Steve Wedge, W1ES/4
"I can't complain, but sometimes I still do."
- Joe Walsh
If the above message appears, it came from Steve's Son of Laptop!
- Original Message -
From: "Jim Shorney"
To:
Sent: Saturday, December 31, 2011 11:58 PM
Subject: Re: [D
Hi Donwelll...ya shot my lights out. :)
I think you are correct if I were doing long-winded RTTY ragchews like
we have done in the past. But the duty cycle is VERY short for RTTY
contesting and (I'm guessing here, less than 50%. I also run a very
good fan. The T4's ran very cool indeed
I got a DXCC-RTTY using my T-4XC with AFSK. I agree with this. I have a fan
blowing upwards above the finals. You can run 75 watts because the contest
messages are short.
73,
Bob WW3QB
Bob,
On RTTY, peaks are the same as average. It is continuous duty. I wo
Hi Bob:
I have done a few RTTY contests with the T4XA and B and run them much
harder than that. FSK is fixed level, tonal without the type of peaks
that make metering audio difficult.
I run it as hard as the tune and CW levels for plate current.
Garey and Don have a lot of experience with R
Bob,
On RTTY, peaks are the same as average. It is continuous duty. I wouldn't
run the T4XC much over 50W, with tubes as expensive as they are today if it
were me. You have to make your own choice, but there is a BIG difference in
the duty cycles of SSB and sound card RTTY. For sure I would
I'm trying to finish this R-4B - it's one of the ones that was extensively
modified, and I've brought it back - mostly.
You've heard that I had to replace a fixed resistor and a pot in the S-meter
bridge circuit. After getting the S METER ZERO pot to its expected range, it
seems that I have to
I have been thinking about using my C-line for the RTTY contest this
weekend.
How do I set the transmit audio (gain) level. Do I set it the same as
SSB where
the peaks are about 150ma? I am not set up here for FSK, so its going to
be a sound card affair.
Any general advice for C-line RTTY?
Tha
The T4B is gone. Thank you all who responded.
73's
Pete N6QW___
Drakelist mailing list
Drakelist@zerobeat.net
http://mailman.zerobeat.net/mailman/listinfo/drakelist
Thanks, Garey. I suspected as much, but wanted to be sure the movements
weren't the same.
That R-4B I'm working on didn't fry the meter, but there's still something out
of sorts with the bridge circuit, as I can't get the meter to zero when the AGC
bus is adjusted to -1.35V. Looks like I'll b
I am thinning the herd as I sort of have a Pauli Exclusion Principle at work at
this QTH--too many radios and not enough space --which means two radios can be
in the same place at the same time.
I have a T4B that I want to find a new home for and it can be seen in rigorous
detail here www.jessy
Nope
The TR-7 is ALL new. The R-4/T-4 meters are all the same basic movement. The S-Meter is the same
from the 2-A through the R-4B. The PLATE meter is the same movement, but the early scale was 0-400
mA and the later ones, (early to mid T4-XB,) changed to 0-500 mA. The TC-2 meter is 0-400
Folks -
I see lots of TR-7 parts floating around the auction sites - including the
S-meter. Are the "guts" of the TR-7 meter compatible with the 4-Twins?
I'm just thinking ahead, in case I every have another close call where the
meter doesn't survive!
73,
Steve, W1ES/4
My question would now be (since you're assuming you'll have to drop a bunch of
money on it anyway...) - what's the power out with it as it is, and how does it
compare to how it was before you noticed the problem?
Jim's right about the resistance: at 15A or thereabouts per filament @ 5V,
millioh
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