At 02:13 PM 08/02/08, you wrote:
Anyone know off hand which size of the Anderson Power Pole connectors is
used on the MTR2000 repeaters?
I'm guessing the 75 AMP, but want to confirm that before I put in an
order. (It will be Tuesday before I'm back in a position to measure one).
Thanks
Chuck
Well, more progress...
I couldn't sleep this morning and was up before the crack of dawn (in other
words, about 4AM) so I decided to do more testing the station.
I have discovered that in order to defeat any individual PL RX tones, I must
have the tone switch OFF on the Four User Control Module
I have an arcom rc-210 and found that the cat cable I had worked fine on a pc
but not on my controller. It turned out to be the circuit in the cable that
converted levels for the yaesu radio took power off of the serial port on the
pc. (cts or dtr I can't remember) anyway I took a 9v wall wart
Skipp, Mike, and others,
A ham club member has a tracking signal generator/spectrum analyzer that
he said has recently been calibrated. He re-tuned the duplexer for me.
Now the receiver hears better than before, but the de-sense has not
changed much.
I have tried the repeater with and
Hi All,
This request is slightly OT but still for Amateur and possible Repeater use.
I read an artical about using a PC power supply as a 12 and 5 volt/ high amp
atable power supply for the bench.
Looking over the specs it looks good for 12v at 19A and 5v at over 30A. Was
interested and due to
The caveat is in the web page text...
[pasted APC web page text]
If the primary power source becomes unavailable, the rack ATS
will seamlessly source power from the secondary source without
interrupting critical loads.
[end pasted text]
Depends on what your interpretation of
John---
I don't know if you have done the following yet but if not you should.
Put an iso-T in front of your receiver and do a simple desense test using
your signal generator into the iso-T. Set the generator for a couple of kc,
deviation at 1 kc so that you can easily recognize it. Run the
Hi John,
Some quick opinion included information...
I would make 100% sure the duplexer notches are properly
placed. I would remove the power amplifier and the preamplifier
and resolve the repeater operation to the best possible
basic level before replacing them back into the system.
Right on the money Scott... many times the antenna and/or
feed line can be the trouble maker. Although not practical
in many cases... a 50 ohm test termination at the top end
of the feed line can tell you a lot...
Knowing the effective sensitivity at the site is a big deal
often overlooked
My definition of seamless is no interruption at all, which usually means
an on-line UPS in which an inverter runs continuously on a DC supply that
floats on batteries. The APC unit on the link shown in the original posting
must disconnect from one source before connecting to the other source- and
The part that would scare me... I suspect the mentioned APC
units are probably using Solid State AC Relays.
Most of the more common SSR's tend to leak through... , which
can be really dangerous in the wrong application.
cheers,
s.
Eric Lemmon [EMAIL PROTECTED] wrote:
My definition of
There was an article in QST a couple of years ago on doing this very thing.
The major caveat is that the power supply MUST see a load at all times, in
order to maintain regulation.
Noise can definitely be an issue, but each manufacturer's supply is likely
to be different from the next, with
I was looking at an ad in the new Texas Towers circular about a brand of
power supply that I have not heard of..it was not Fischer-Price but
something like Jetblue or JETSTREAM. These claim to be fully filtered and
RFI friendly. Anyone ever try one of these? They have models up to 45 amps
and
John might find this article interesting...
http://www.repeater-builder.com/tech-info/effectivesens.html
Mike WA6ILQ
At 09:56 AM 08/03/08, you wrote:
Right on the money Scott... many times the antenna and/or
feed line can be the trouble maker. Although not practical
in many cases... a 50 ohm
Hello (Again) John
Yes--It is necessary that you put the iso-T immediately in front of your
receiveryou want to be testing against the signal that is presented to
your receiver after all of the processing before it.
A couple more thoughts
Don't overlook the possibility that your
You gentlemen have really made me think about the pros / cons of the
DB314. After talking with my tech partner on this project, I think we
are going to go with a DB224 and DB408 or DB420 combo for the remote
antenna. It really is overkill for a remote antenna, but since we
will be given a
Make sure you don't have any early model Mocom 70 (we're talking early
70s here). The initial production runs did not have the famous and
reliable cavity front end in the receiver but a series of copper cans
with coils inside. These were as broad as a barn door and resulted in
desense from
That appears to be a Mocom 70 dash mount radio. They did manufacture some and
they were often found in things like Cement Trucks and other large heavy
machinery with space to put a big radio up front. They had to have everything
torqued down inside very tightly as the shaking in that
Wanted to buy. We need a set of duplexers for our 2 meter repeater. It
is on 146.720 with a - 600 kc input. Does anyone have anything
suitable. We have been looking at the Sinclair Q202GR on eBay at this
time. Does anyone know anything about these?
Thanks, Mick
Fred,
I think you're a top-notch daydreamer! But seriously, I wonder if any
multi-band antennas have a DC-grounded construction that will handle a
lightning strike. Also, the harmonic relationships of the 2m, 220, and 440
bands in one antenna might create an effective intermodulation generator.
Hi Mike,
Thanks for the reply on the cables.
Please contact off list and how much do you want for them, maybe a dozen or so?
[EMAIL PROTECTED]
73,
Mike aka KB5FLX
Thanks eric for the reply, I'll try that.
mike
- Original Message -
From: Eric Lemmon
To: Repeater-Builder@yahoogroups.com
Sent: Saturday, August 02, 2008 7:55 PM
Subject: RE: [Repeater-Builder] Re: Dual battery system
Mike,
I have standardized on one part, the
Had to repost this because of bad email typing
Has anyone ever converted one of the DB Products 4001 highband pass
cavities to a 222 pass or pass notch cavity? I know DB makes or made a
222 version of that mocel but wonder if it is feasible to cut one down
and make new loops. Appreciate any info.
Dependant on your needs it is entirely possible to use as is OR rewind things
for a given output , google it as several articals are available , if I can
make one work most anyone can , I notice no particular additional noise on hf
although I do live in town which may be a noisy site anyway
M
I once cut down 4 VHF cavities for a BP/BR 222 duplexer. Fairly straight
forward but
probably not worth the labor involved.
Jack - N7OO
- Original Message -
From: k0jxi
To: Repeater-Builder@yahoogroups.com
Sent: Sunday, August 03, 2008 4:38 PM
Subject:
I have a new but open boxed DB201M uncut version 144-174 Mhz for sale
or trade. It comes with the DB365-OS clamps also. Also have two, 2
channel UHF GE MLS I's for sale. Comes with one hand mic,one desk
mic,DC cord and one mobile bracket all in excellent condition. Also
have one Midland 1340B
I did a computer supply conversion here. the one I did was a 150W supply so
only good for about 10A. I followed the QST article for the conversion.
This one had a pot for adjusting the voltage. I had to change one resistor
value to get 13.8 VDC out. The output wave form looked like the early
Local club is in need of a 222 bandpass filter or cavity suitable for use
between the duplexer and the pre-amp. Please email direct if you have one
avaulable.
Thanks
Mike/W5JR
John,
What issue of QST carried the article about converting a PC power supply?
73, Eric Lemmon WB6FLY
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of kf0m
Sent: Sunday, August 03, 2008 7:41 PM
To: Repeater-Builder@yahoogroups.com
May 2002 QST had the computer power supply conversion article
QST switching power supply product reviews are July 2006, January 2000, and
Sept 2000
John Lock
kf0m at arrl.net
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] Behalf Of Eric Lemmon
On a quick look at the available controllers around the SCOM 7330 looks
like a fairly new kid on the block. I wonder if anyone has had any
experience with this model or SCOM as a whole? -Mike
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