ph...@aol.com writes:
Looking for a Drake AC-4 power supply in good shape, must be complete
functional even if not re-habbed/re-capped/upgraded. Just need the supply,
Paul, K4MSG
I have one, intact, original, and functional, will even sell the Heathkit
recap package which is not
I'm trying to wire a D-104 Silver Eagle to my T4XB and not having much luck.
There's 5 wires from the mike: White w/Shield, Black, Red, Blue and Yellow.
I believe the correct wiring to the S230 would be:
Red to tip, White to middle (audio) and Black and Shield to ground? Any
suggestions would be
Gents,
My TR-7 started doing something unusual this morning. I tried to
check into a 40m phone net and I noticed my external VSWR meter going
crazy. It's a dual-needle type and I would start talking and things
would be okay and then the reflected needle would instantly jump to
Dave,
Does the built-in TR-7 reflected power meter jump to infinity?
A couple troubleshooting suggestions:
Disconnect the antenna and feed the TR-7 directly into a dummy load.
Disconnect the mic and see if this happens on CW.
Good luck with it.
Tom, AG9X
On Sat, Oct 16, 2010 at 9:19 AM,
Some more data points:
1. I cannot get the radio to malfunction on a dummy load. I have only
seen the problem on 40m when connected to the antenna which is a 135-ft
doublet fed with ladder line. Tuner is a Tentec 238B and the tuner is
right next to the TR-7. That leads me to wonder if
Also check for a broken lead somewhere in the ladder line as well as the
connections at the antenna. The breaks can be hard to see sometimes, so you
have to check very closely.
I have basically the same set-up with one of my TR7s but I use an MN75. When
one of the leads breaks on the ladder
Dave -
If the external SWR meter goes to 'infinity' on reflected, then the
problem is PAST that meter. The fact that it is ok on a dummy load also
indicates an antenna problem.
Sounds like an open feedline, - OR - balun, if used.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-B,
Thanks for those who offered, I found one locally.
Paul, K4MSG
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That *almost* sounds like the 40 Meter oscillation problem - except for the
behaviour of the forward power meter. Some TR-7s are prone to PA deck
oscillation in the 40 meter band with a reactive load (antenna). The easy fix
for this is to reduce the gain of the predriver board by adjusting the
On Sat, 16 Oct 2010 09:54:20 -0400, Joe Loverti wrote:
I'm trying to wire a D-104 Silver Eagle to my T4XB and not having much luck.
Joe,
There is a plethora of D-104 informaion on the internet - schematics, wiring
info, etc. Google is your friend. I could look it up for you later, as I really
Has there been poor propagation last couple days, solar storm maybe ?
I went to use the R4B yesterday, there was a prominent buzzing noise on
the bands, and could hardly get any signals on any bands.
Didn't sound like regular QRN, and I couldn't find any noise source in the
garage, so I decided
Chuck,
Same problem here on 40m last night anyway. I was trying to get some audio
checks on several mics and just gave up and used the best one I have (a NIB
EV-664, ugly Army green, but new, hi) and no one complained that could hear me.
Same buzzing sound here, and VERY loud, usually way
Date: Sat, 16 Oct 2010 12:03:18 -0400
From: K8JDC k8...@sbcglobal.net
To: drakelist@zerobeat.net
Subject: [Drakelist] TR-7 - More Info
Message-ID: 4cb9ccc6.7020...@sbcglobal.net
Content-Type: text/plain; charset=ISO-8859-1;
format=flowed
Some more data points:
1. I cannot get
Jim -
Is that a possibility? If the antenna is tuned to 20M by the tuner, and
the transmitter is putting out 40M RF, then the transmitter is seeing a
mismatch and 'shuts down'. Does it 'really' go to ZERO power or is it
just rolled back to 20 or so Watts?
BUT, if you put 40M RF into a
To everybody who has written thus far, I thank you. Still working on
it...
- I have double-checked the ground connections on the tuner and radio.
All is good there.
- To Gary who suggested that the external tuner indicated that the
problem was past that point, I hooked my Tentec up to
Thanks to you all who replied to my question about the microphone hook-up.
Got it working... Best regards,
73,
Joe
WW8X
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I seem to recall reading that there was a right way to use DeOxit, and
specific areas where you shouldn't use it at all., but I can't pull the
details out of memory. (There were stories about connections not being
made any longer, phenolic wafers swelling and switches not working,
lubrication
On Sat, 16 Oct 2010 16:50:50 -0400, K8JDC wrote:
I had trouble keeping it from oscillating when I followed
the instructions. I tried to follow the service manual carefully but it
wanted to oscillate. I had to fiddle with it a fair amount going
between the two adjustment pots to make it
On Sat, 16 Oct 2010 15:43:01 -0400, Garey Barrell wrote:
Is that a possibility? If the antenna is tuned to 20M by the tuner, and
the transmitter is putting out 40M RF, then the transmitter is seeing a
mismatch and 'shuts down'. Does it 'really' go to ZERO power or is it
just rolled back to
Well, Walker, since I don't see anyone jumping in here to answer you, let me
take a stab at it. First, DeOxit should be used sparingly, like a drop at a
time, and NEVER sprayed on a bandswitch, or like switch with phenolic
wafers.
I use a toothpick (or insulin syringe if I can find them) to
Regarding the bias setting of 70ma, what is the impact of lower bias setting (
say 60ma )?
Regarding neutralization, this transmitter seemed to need neutralizing based on
behavior on 40M. On 15M, the neutralization seems exactly on ( maximum
output at minimum plate current ). What would
Sorry for hogging the Drakelist today...
I backed off the pot on the predriver board and it's happy so far. I
backed it off very slightly and it still oscillated on 40m so I had to
go further. I think I still have about the same output power and I
think the ALC LED is still coming on
I like to use the DeOxit Pen for tube pins, pilot lamps, cinch connector pins,
etc. For relay contacts, I saturate small strips of card stock with deoxit
spray, then run them through (do the same for phone jacks and others that have
a
break/make contact in there. I use the concentrate in the
?I was plagued with the 40M oscillation problem with the same symptoms - a
40M antenna with a bit of reactance resulted in the oscillation. I decided
to build the PIN diode attenuator per the PA1HFO design and solved the
problem that way. That allows you to set the signal level fed to the
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