@yahoogroups.com
Subject: Re: [Repeater-Builder] Mitreks as UHF Repeaters?
?
Tim,
My plan at this point is to convert them to full duplex, so I
can use the second Mitrek to prepare a complete, plug-in,
standby set of RF decks. The mods look very straightforward,
but I was wondering
After a few years on the sidelines, it looks as if I'm going to be jumping back
into repeater ownership. I have a few nice pieces left from my last adventure,
including a TX/RX duplexer and a loaded S-COM 7K, but I'm pondering choices in
RF decks. This will be a local UHF machine designated as
Good question Paul. Remember the Mitrek RF decks are almost the same
used in the MSR2000 repeater, and with their tuned helical front end
make great receivers.
For the transmitter however, I would not run it on its own. Also
reducing the power output below 50-66% of rating might cause
I've used a lot of Mitreks as repeaters and loved them, but you're right about
the PA -- if you don't like fans, it's going to get too hot. Consider getting
the exciter output after the helical filters and use a different PA. I have a
couple of Mitreks stashed in a corner somewhere just in case
shielding and
filtering techniques to get the
rx desense down to a reasonable level.
73 de Jack - N7OO
- Original Message -
From: Tony KT9AC
To: Repeater-Builder@yahoogroups.com
Sent: Monday, April 26, 2010 8:09 AM
Subject: Re: [Repeater-Builder] Mitreks as UHF Repeaters
: Jack Taylor j...@n7oo.com
To: Repeater-Builder@yahoogroups.com
Sent: Monday, April 26, 2010 8:27:44 AM GMT -08:00 US/Canada Pacific
Subject: Re: [Repeater-Builder] Mitreks as UHF Repeaters?
I converted a UHF Mitrek for full duplex packet operation once. Don't
recommend it because
, even after hours key-down.
Guys, I appreciate all the input.
73,
Paul, AE4KR
- Original Message -
From: w7...@comcast.net
To: Repeater-Builder@yahoogroups.com
Sent: Monday, April 26, 2010 10:16 AM
Subject: Re: [Repeater-Builder] Mitreks as UHF Repeaters?
Isn't
@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Paul Plack
Sent: Monday, April 26, 2010 1:49 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Mitreks as UHF Repeaters?
?
Tim,
My plan at this point is to convert them to full duplex, so I
At 10:49 AM 4/26/2010, Paul Plack wrote:
Your heatsink approach, however, is exactly what I was talking
about. I have several very large heatsinks originally designed for
use with big SCR switching circuits which look to be more than
generous for a 30w PA at 100% duty cycle.
Remember
On Mon, 26 Apr 2010, Paul Plack wrote:
Your heatsink approach, however, is exactly what I was talking about.
I have several very large heatsinks originally designed for use with
big SCR switching circuits which look to be more than generous for a
30w PA at 100% duty cycle. My first
, April 26, 2010 10:49:00 AM GMT -08:00 US/Canada Pacific
Subject: Re: [Repeater-Builder] Mitreks as UHF Repeaters?
Tim,
My plan at this point is to convert them to full duplex, so I can use the
second Mitrek to prepare a complete, plug-in, standby set of RF decks. The mods
look very
become, it mike just
make sense to use two radios, and source more spares.
73,
Paul, AE4KR
- Original Message -
From: Ken Arck
To: Repeater-Builder@yahoogroups.com
Sent: Monday, April 26, 2010 12:01 PM
Subject: Re: [Repeater-Builder] Mitreks as UHF Repeaters?
At 10:49 AM
@yahoogroups.com
Sent: Monday, April 26, 2010 12:26 PM
Subject: Re: [Repeater-Builder] Mitreks as UHF Repeaters?
On Mon, 26 Apr 2010, Paul Plack wrote:
Remember, the 100W Mitrek had a heatsink that was rated for 35W and used
the duty cycle to keep things cool. If you do a case swap from
- Original Message -
From: Jeff DePolo
To: Repeater-Builder@yahoogroups.com
Sent: Monday, April 26, 2010 12:11 PM
Subject: RE: [Repeater-Builder] Mitreks as UHF Repeaters?
Because of the internal desense issue, I'd build them the same, but operate
the two radios separately
At 11:47 AM 4/26/2010, Paul Plack wrote:
Ken,
Correct, of course, but I'm assuming that in a 30w PA, smaller
components not somehow directly sunk to the main chassis heatsink
will reach their max operating temps in a very few seconds of
key-down, and therefore have to be spec'd the same
I appreciate the thoughts. Anytime I've looked at a scheme
which allows simply swapping the TX and RX to get back on the
air, I arrive at the same conclusions...
(1) If I took a lightning hit at the site, I'd want my spares
to have been stored somewhere else.
(2) Once I swap the TX and
I'd need in my application.
73,
Paul, AE4KR
- Original Message -
From: Ken Arck
To: Repeater-Builder@yahoogroups.com
Sent: Monday, April 26, 2010 1:09 PM
Subject: Re: [Repeater-Builder] Mitreks as UHF Repeaters?
At 11:47 AM 4/26/2010, Paul Plack wrote:
Ken
On Mon, 26 Apr 2010, Paul Plack wrote:
I am completely unfamiliar with the Syntor, cost, availability, etc.,
but I'm also early in the process of nosing around locally. I'm
willing to look at any plentiful, high-quality radios for the
conversion. 73, Paul, AE4KR
Syntor -- not Syntor X
Plack pl...@xmission.com wrote:
From: Paul Plack pl...@xmission.com
Subject: Re: [Repeater-Builder] Mitreks as UHF Repeaters?
To: Repeater-Builder@yahoogroups.com
Date: Monday, April 26, 2010, 3:07 PM
Ken,
Thanks, appreciate the link. This document adds a few
@yahoogroups.com
Sent: Monday, April 26, 2010 3:26 PM
Subject: Re: [Repeater-Builder] Mitreks as UHF Repeaters?
I ran a Duplexed 50W UHF mitrek @30W with a Fan on the heat sink for 5
years without a problem. I Upgraded that site to a full blown UHF Micor
Repeater that is 75W
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