Mark,
I don't know about everyone else, but I truly appreciate the
information. I've used reed relays in the past, but certainly didn't
and don't know much about them. Your info helped clear up some questions.
Thanks,
Rick/K5IZ
W1EOF wrote:
Well like machanical relays it's very much
I agree, they are very small for a 250 watt transformer. I made a few
more adjustments such as line voltage and tightening up the old E
model tranny. Hopefully, when I get the back on it will be usable now.
I sure appreciate all of the suggestions, advice and experience I have
received
] On Behalf Of Rick Brashear
Sent: Thursday, March 16, 2006 9:43 PM
To: Discussion of AM Radio
Subject: [AMRadio] Modulator feedback
I've posed a couple of questions on some other lists and received some
good advice, but I am still in need of more. My BC-610-E has a bad
feedback or talk back problem
Thanks Mike. I just made a discovery about the 2A3 A-F drivers. I had
a set of matched NOS RCA tubes in there. The feedback seemed to be
coming from the area of those tubes more so than anywhere else. So, I
exchanged them for another pair I have and it seemed to help quiet the
feedback.
Thanks Don. I used a 100 uf capacitor at 160 vdc, so it should be
sufficient. I hooked it up exactly as you stated, positive to ground
and the negative lead toward the center tap of the HV transformer. I
wish I could say it stopped it, but I still have problems. It did stop
a lot of the
Jim, you have a dandy idea there. The plate supply for the drivers is
kind of weird. When I was going through the transmitter I replaced most
of the components in the modulator section as most were out of
tolerance. Maybe I made a mistake, I'll sure check. Thankfully, the
modulator deck
I've posed a couple of questions on some other lists and received some
good advice, but I am still in need of more. My BC-610-E has a bad
feedback or talk back problem. I've placed a capacitor across the
overload relay (RY-5) and that did eliminate a little of the talk back.
However, with
John,
If it were me, I'd put that old girl back in shape when time allowed.
Just to think of those two magnificent 450 TL's glowing in the night is
enough to bring a tear to ones eyes. Great find!
73,
Rick/K5IZ
John Lyles wrote:
I picked up this thing yesterday at a SK's wood shed for
Try W7RF, Radiodan, at the link below. I personally like Bird meters
and he has a good assortment of new and used meters. Some are PEP ready
or you can buy a kit (either original Bird or a knockoff) to convert a
regular Model 43 to PEP. They are designed for continuous duty and you
can get
This is just a guess, but a lot of older watt meters used 1N60 diodes.
The inductor is most likely in the 250 - 275 uh range.
73,
Rick/K5IZ
What is everyone doing for a watt meter?
My swan wm-3000 blew up last weekend, it reads no pep
and about 1/4 of the correct average power.
I
There may be a manual on BAMA. If not, quite likely you can locate a
schematic indicating the part numbers you need. I feel sure you'd be
safe with just about any diode in the 1N60/1N34 category.
73,
Rick/K5IZ
Brett gazdzinski wrote:
The diodes looked like 1n34a's, but who knows.
I think
Cool page... THANKS!
Rick/K5IZ
Craig Roberts wrote:
I like my homebrew projects to look as professional as possible. One
difficulty in achieving the commercial look has been fabricating the
front panel. An electric drill, a can of spray paint and a Dymo label
maker just doesn't do it when
You're a lucky man, Larry. I wish I could get WABC 770 Kc here in
Dallas. Enjoy!
Rick
K5IZ
ne1s wrote:
Last Saturday nite I was down in the cellar shack, working on building
a PP 805 modulator deck for a 1930s open relay-rack transmitter I'm
restoring that, to the best of my knowledge,
I'm sorry to hear about that Don. How is she doing today?
Rick
K5IZ
Donald Chester wrote:
http://www.theleafchronicle.com/apps/pbcs.dll/article?AID=/20060119/NEWS01/601190314/1002/NEWS17
http://www.dnj.com/apps/pbcs.dll/article?AID=/20060118/NEWS01/601180335/1002
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