Dave is absolutely correct. The original post states 160 Watts in to the
duplexer and 130 Watts out. That equates to less than a dB of loss through
the duplexer ( .9 db to be more accurate ).
Wade - KR7K
Where did you acquire that from this thread? My VSWR was after the
duplexer?
Mathew
- Original Message -
From: Jim B. [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Friday, January 21, 2005 1:20 PM
Subject: Re: [Repeater-Builder] Re: Powering the Repeater With Marine
Batteries
edctexas wrote:
Look on the Kevin's Web site under Astron power
A friend of mine and I designed a very simple circuit to modify the
Astron 20A Power supplies to do this job. Obviously this could be done on
any power supply but the Astron 20A is common and inexpensive and they leave
enough room to put this all inside easily. The first thing you will need is
Since the PA in these radios is class C they are always active and they
rely on the loss of input signal to drop the amplifier. Sounds like you may
have some oscillations in your PA after the exiter drops generating the
spurious output. I have seen this many times before. especially on
Rod,
The idea here is to get as much vertical seperation as possible, it doesnt
sound to me like you have enough seperation if both antennas are mouted to a
station master tube. Also, the rule of thumb is, the more gain an antenna
has, the better vertical isolation you get. Yagi's have good
Actually, there was some discussion here a week or two ago about
simplex repeaters. It occured to me that this is one instance where they
are usefull (portable operation on 2 meters) since there is no such thing
as a mobile duplexer with a 600KHz seperation for VHF. If one needs true
Those Motorola Power supplies that have the battery back-up feature are
really cool, unfortunately, they are also kind of rare and expensive (unless
you luck out at the swap meet or on e-bay).
A friend of mine and I designed a very simple circuit to modify the
Astron 20A Power supplies
The UHF Micor Mobile was a little tricky to tune, especially the AFC
type. I would take care to follow the tuning procedure as outlined in the
manual to the letter.
Also, I am not sure what isolation measures you have already taken but
they would have to be fairly extensive for pairs
The Motorola shop I worked in had a Sinadder in the cabinet with about
an inch of dust on it. All of us Techs used it when we first started until
we realized that after tuning 3 or 4 receivers a day for several weeks, it
wasnt hard at all to do it by ear.
Wade - KR7K
- Original
Most Motorola radios that had the control head seperate from the rest
of the radio used ignition sense. On the older radios it was plugged into
the rear of the control head. Its been several years since I was a radio
tech but as I recall pin #19 on the back of the head was +12 VDC for the
, to notch out the repeater's
transmitter, might do the trick.
The squeel, while annoying, isn't a big deal right now. The repeater
itself
id deaf as a post, and we know that is attributable to the Micor receiver
itself.
Thanks and 73,
Chris, KG0BP
- Original Message -
From: Wade
That works too...
Wade - KR7K
- Original Message -
From: Gerald Pelnar [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Saturday, January 08, 2005 9:47 PM
Subject: Re: [Repeater-Builder] in-band linking update
- Original Message -
From: Wade Lake [EMAIL
That would depend on the radio service you are
getting the frequency pair for..
If its for the
Amateurservice then contactalocal club and someone there
should be able to put you in touch with the local frequency coordinator for your
area. This function is usually done by a prominent
I agree with Coy.
snip
That's the trouble with most of these post, and all of them using
transformers. You are still driving audio back into the other output
stage. That will sooner or later distroy the audio output PA !!!
I've replaced many expensive PA Moduls becaue
This sounds like a viable solution on the surface, however, it may be
more trouble than its worth. Care would have to be taken to get it to sound
decent. The speaker grill would have to be sealed properly. Also, be
careful if you use Maxtrac speakers for anything but Maxtracs. They were
I have to agree with these guys, I have run on the tripler output on my
Micor UHF repeater while making PA repairs. The tripler outputs something
like 2 watts and I probably had less than 1 watt at the antenna. The last
time I had PA trouble I left it that way for a few months because
was a snap too. This was around 7 years ago and the radio has
performed flawlessly. Also, you can pick up a Mitrek for 10 or 20 bucks at
a swap meet.
Wade Lake - KR7K
- Original Message -
From: Jim B. [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Monday, December 27, 2004 12
Sorry,
their search engine does not allow that without a previous browser
session. Just go to http://www.digikey.com and enter 2.2mH choke in the
search window. Select fixed(7 items).
there are a few to pick from.
Wade - KR7K
- Original Message -
From: Wade Lake
John,
I did a quick search and found those at Digikey, follow this link.
http://www.digikey.com/scripts/DkSearch/dksus.dll?Filter
Wade - KR7K
- Original Message -
From: JOHN MACKEY [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Thursday, December 23, 2004 10:07 AM
Kevin,
I now realize the mistake
I was making in looking at this. I am used toseeing newer PLL's with
a much higher reference oscillator frequency and having a divider in the
reference side before the Phase Comparator. In that case the stability
does improve over that of the reference
The advantage here is the same
frequency stability is achieved by the use of the quartz reference
Actually, a PLL oscillator is much more stable than a multiplied
crystal oscillator. because with a multiplied quartz oscillator, frequency
drift and frequency error (usually deviation as
I standcorrected, in
part anyway. In this GE radio the deviation is indeed at a divide by 12
from the output. This is why I said "usually", I am not familiar with
theintricate detailsof all radios. Especially GE's, I was a
Motorola tech for quite a few years. I will leave the GE's to
Actually the same applies to the Deviation, at the
fundamental Icom output it should be 4 times less "wide" than the output
deviation. In this particular case.
Wade
- Original Message -----
From: Wade Lake
To: Repeater-Builder@yahoogroups.com
Sent: Sunday, December 19,
One exception might be the Maxtrac radios. Motorola churned out hundreds of
those repeaters built from two Maxtrac radios and a RICK controller. I am
pretty sure they were using those on
GMRS. also the Motorola Desktrac radio was essentially 2 Maxtrac radios
inside. I would bet that it was
Not that I am sticking up for rule breakers or anything, but I doubt
the FCC has the manpower to go after 802.11 offenders. It's basically like
with CB anymore. If you are not causing major problems for a lot of folks,
they arent going to look your way.
That being said, I believe in
I personally have
experienced more problems due to the antenna rods being loose especially the
Diamond colinear antennas. I have not had problems due to 9913 cable usage
before, its not out of the realm of possibilities but I would suspect the
connectors and how they are installed more
I have built or been involved in building dozens of repeaters, new and
old, many flavors. The absolute best sounding, trouble free and ruggedest
repeater or mobile radios, bar none, I have ever seen are the Micor radios.
Besides they have that awesome dynamic squelch and better audio than
thats 2 transistor inverters you now owe meLOL
say the magic word and Build yourself a new Repeater..
Wade Lake wrote:
Notice that his email username is groucho. I guess there is a reason
for
that.
- Original Message -
From: Eric Brownell [EMAIL PROTECTED
Amen,
I have had a few 10 meter repeater QSO's just to try it. They were all
incredibly short due to about 12 interfering repeaters all being keyed up at
once!! You would think that a 10 meter repeater op would, at the very
least, set them up to require a CTCSS tone so that they dont
I have an435 MHz
simplex linkradio on a 440 MHz repeater. I have my controller not
holding PTT for a hang time on the link port and obviously no courtesy tone
either. The other repeater I am linking to is set up the same
way.This makes the link very seamless. You cant even tell that
its
Notice that his email username is groucho. I guess there is a reason for
that.
- Original Message -
From: Eric Brownell [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Tuesday, November 30, 2004 9:56 PM
Subject: RE: [Repeater-Builder] Inverting COS
Just like you,
I have never had problems using LMR-400 - just secure it well with a
cable tie every foot or so. That way the cable should not move around and
cause any noise issues. There is no doubt that some Andrews LDF-4 or
other hardline is better, but if you use non hardline type cables it is hard
to
Don't bother - The mini-uhf's are not that hard to work with and easy
to get. If yours is broken just get to a Motorola shop and order the
replacement. You may even be able to order the part direct from Motorola.
Otherwize, you would just end up spending time hacking the radio and gaining
They make Awesome repeaters. Motorola made thousands of repeaters out
of Maxtracs. The only pitfalls I am aware of is to back the TX power output
to 1/2 and run a fan on the heat-sink.
If you use Maxtracs, get ones that have the 16 pin accessories
connectors - they can be
10-9? 10-9 anyone?
I guess today is happy 10-9 day then
- Original Message -
From: Neil McKie [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Friday, October 08, 2004 10:19 PM
Subject: Re: [Repeater-Builder] Re: Happy radio day! - Happy 10-4 Day ...
Ok ...
Point taken. 1/4 wave antennas are not truly isotropic. The vertical
seperation can be much less if gain antennas are used however, and gain
antennas give better coverage further out, which is usually a benefiet.
Wade - KR7K
- Original Message -
From: Tony King - W4ZT [EMAIL
I have not encountered any forums specifically for DDS projects. I
wanted to build one for a QRP project I was working on but I also wanted
to try replacing old channel elements with one to make a Rock bound
Motorola or GE, frequency agile for remote base operation. The NJQRP
kit parts
As long as you are using 1 antenna system for TX and another antenna system
for RX then that will work without a duplexer, if you follow a few
guidelines. First, you have to use gain antennas (not 1/4 waves verticals).
Unity gain, omni-directional antennas (like 1/4 wave verticals) radiate in
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