Does anybody have any info on programming the Johnson 3450 LPI repeater.
i have all but one page and the programming interface schematic.. and im
looking for the hook-up diagram
thanks
Brent@
brent2tnweb.com
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If you are looking at a station pa deck and the output filter is on your
right side - or a mobile and the fins are away from you, look to your
left near the horizontal centerline and into the left 1/3 section - you
should see a potentiometer on the pc board - this is the driver control
- mostly
Thanks for all replies to the Diamond X-500 question several weeks
ago. Now, on to another topic.
I recently replaced a DB-420 UHF antenna because of duplex noise on a
business band repeater. I wasn't sure if it was the antenna itself
or the surroundings. It was replaced by a Decibel DB-538
You should send this to the manufacturer and see what kind of comment,
if any, is offered.
-Original Message-
From: Derek B. McIntyre [mailto:[EMAIL PROTECTED]
Sent: January 01, 2004 08:22
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Duplex noise on new DB-408 and
I've never heard of this happening before. I've always had very good results
with DB folded dipoles. I must wonder if a phasing harness quality control
problem developed - maybe when DB was sold. Workmanship issues continue to
increase almost everywhere, it seems. Not really sure what to make of
Had this problem with 146.64, the only way to cure it was to replace
all of the cable in the house and the drop to the cable co tap with
RG-11, and terminate all unused outlets in the house.It is still there
slightly but perfectly watchable
Chuck Kelsey wrote:
Cable channel 18 is 145.25
My 2 meter link on my repeater is causing TVI. This happens only
on cable ch 18 on Charter Cable here in Yakima, WA. Any one have
any ideas? This is only on the houses, say with-in 1/2 mile.
Sounds like the cable chanel 18 is using frequencies in the 2 meter band.
Have everyone that is
What you have is a sort of band pass/reject configuration. The cavities with
an in and out (two slugs) are pass cavities, the cavities with only one slug
are reject cavities. The dulpexer can be re-configured to work as a notch
duplexer, with 3 cavities in each side. You would have to check the
it's called the r-8 control in the service manuel
- Original Message -
From: Virden Clark Beckman [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Thursday, January 01, 2004 10:12 AM
Subject: Re: [Repeater-Builder] GE Master II power output
If you are looking at a station
Except that if the cable plant is leaking signal at 2 meters, it is most
likely leaking at 220 as well.. Cable channel 23 is 216-222 and channel 24
is 222-228 MHz.
Chuck
WB2EDV
- Original Message -
From: Adam T. Liette [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent:
At 05:24 PM 1/1/04 -0500, you wrote:
Cable channel 18 is 145.25 video, 148.83 color and 149.75 audio. I'll bet if
you drive around and listen to 145.25, you'll pick up the video carrier -
sounds like a buzz. It's the cable system leaking or an improper connection
in someone's house. It is not
Cable CH 24 - 223.250 MHz (video carrier - same as CH 18 on 145.250).
Only difference is that it's between repeater inputs (input to 224.840
and 224.860) and not on a repeater output (in most areas of the USA).
Joe M.
Adam T. Liette wrote:
Another good reason to look at 220. Good prop, little
Contact your local cable company, and ask to talk to their engineer. You may
have problems getting him to come to the phone, but I would imply that if
they don't want to talk to you, that you would call the FCC because their
cable system has leakage in excess of 20 MV per meter (that is the most
In the Charleston SC area we have a repeater on 145.25. When we went on the
air we discovered CATV interference. When I contacted the engineer at the
CATV plant, he asked when we could meet. We found out that the CATV plant
could offset a channel. They have to do this for certain aeronautical
I don't have build specs for that particular antenna on hand however the
shaking and producing noise on the ground doesn't sound good, could it
be the hardline connector making intermittent to the mast? Try
insulating the mast wrapping positions with scotch electrical rubber
tape covered with
Here's what Times Microwave has to say about cable noise:
SELF GENERATED CABLE NOISE
A noted cable phenomenon, is the generation of acoustical and electrical
noise when flexed. The acoustical noise is a function of mechanical motion
within the cable. Such noise (and the associated mechanical and
On Thursday, Jan 1, 2004, at 16:00 America/Denver, Adam T. Liette wrote:
Another good reason to look at 220. Good prop, little noise.
Ft.Recovery
Ohio has a 145.250 - machine. :-( Good machine, bad noise. I prefer the
224.62 linked to it.
Unless of course there's a Channel 12 or 13
[EMAIL PROTECTED] wrote:
To get it to move to 2-Meters with a 600 KHz split, we had to order three
new longer notch tuning capacitor brass tubes for one side
How far down did you go? I think that's the same model I have that went
to 146.37/.97 MHz fine. And I think it started life around 155
any way to tune duplexers without a scope or monitor ?
Bobby/N2BR
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We always did had to change out the shorter rods. And at hamfests, VHF
WACOM duplexers being sold are often noted as having the 2-Meter notch
rods, etc. if they are all ready to go to 2-Meters. I moved this narrow
split 151 MHz one to 144.79/145.39, and prior to that, to 147.74/147.14,
and all
Make sure he calls the cable company to complain. That's the
one thing they do listen to - upset customers (well, sometimes).
That will make them clean up their system quick.
Where was it the strongest? From HIS house, perhaps? Wouldn't
it be ironic if the cable company found HE was the problem!
I simply brought it up since mine worked fine on a 100W+ repeater while
I took a look at the regular set. Maybe I could get some deeper notches
out of the one I have. I'll have to look into it. Maybe the ones I have
are not 642s. I know they are 6-can WACOMs. Regardless, it's something
I'll have
I have a WACOM WP-642 pass/reject, 6-cavity duplexer which is tuned up on a
2-Meter pair for a 600 KHz split, and works excellent. It was originally
ordered from WACOM to operate on a 270 KHz (!) split in the 151 MHz range
VHF business band.
To get it to move to 2-Meters with a 600 KHz split, we
Thank you to all who sent replies. Very helpful. I was talking on 2
meters tonight, and what do you think happened? My next door
neighbor called me and asked my if I was just talking on my CB. I
very quickly corrected him and said yes I was talking on my Amateur
Radio, for which I have a
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