Where is this choke you are talking about used? If it is the cathode
choke... it is 15uH not mH.
When I build my 8877 amps, I use an off the wall Radio Shack part for the
cathode choke. They have a 100uH choke and it is cheap, built with good
wire. NEVER had a failure or a funky resonance using one of them.
This is the only part RS sells that is worth any salt in my opinion and they
have been selling them for 25 years.
Now I will go tangent since I mentioned RS:
Since RS is a totally useless radio entity, they'll probably discontinue the
choke soon and replace it with more 435MHz periodic emitters. Try driving
around on 435MHz (435.135 if I remember correctly) and listen to all the
wireless thermometers bweeping every few seconds. I live in a town of 150K
people and anywhere in town can hear no less than 10 of them at one time
chirping away right in the middle of the ham band.
I'm just a little touchy about this subject and went semi crazy in a store
about 4 years ago... Wrote RS and called ARRL, its perfectly legal if the
timing is only so many bweeps per minute (per unit). But as a part
"whatever" device must accept interference... Says nothing about the
interference it causes.. The problem is with 25 of them in your neighborhood
they are a PLASMA. When I'm active on 432 about once a month I sweep my
neighborhood clean with 500K ERP. I assume the things burst into flames on
the wall of the house and get thrown away. Eventually the batteries go dead
on the sensor (transmitter) outside the house.
I've done several drivebys with the IC-706 and its pretty easy to DF the
things. If a guy was really a militant I suppose you just act like a meter
reader and steal all the sensors out of the yards. I'm off 432 right now
and assume my neighbors are all standing in long lines again at the damn
store buying these things as I type this.
I had another thought to build a BWEEPER myself with about 500W and always
have it say 50 below zero. They'd take the things right back.... The guy
would install it and it would read 50 below, pretty funny. That would
prolly neutralize my whole town.
BOB DD
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Dan Hearn
Sent: Monday, May 21, 2007 11:12 PM
To: kk4tr; amps@contesting.com
Subject: Re: [Amps] Replacement plate choke for Alpha 76
Joe;: Along that line I believe I once saw a mod for the RFC on the 76A as
it had an undesired resonance on, I believe, 15 or 17m. The guy made a
single turn of insulated buss wire around the choke. He moved it up and down
until the resonance was moved into the CB band so it would work on 15 (
could have been 17m). If it ever was bought by a CBer smoke would ensue. I
think the tip was in some small DX magazine, not one of the present
magazines. FWIW. 73, Dan, N5AR
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]On
Behalf Of kk4tr
Sent: Monday, May 21, 2007 5:56 PM
To: amps@contesting.com
Subject: [Amps] Replacement plate choke for Alpha 76
Does anyone have a source for a replacement plate choke for an alpha 76.
The value on this one is 15 MH @ 1 amp. The RF parts version for
replacement is 225mh @ 1 amp. The rf parts replacvenet has screwed up the
amp even more!! Now the amp doesn't work at all!! Any Ideas out there?? Oh
by the way Alpha does not list any replacement for this part on the
website.
Joe KK4TR
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