roups.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
ilder@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
Repea
n, 4/26/10, Paul Plack wrote:
From: Paul Plack
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 details
to what I had on han
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
the power 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:
> 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
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 for
os.
73,
Paul, AE4KR
- 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 tw
epeater-Builder@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 c
heap as these radios have 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 Repeat
s.com
Sent: Monday, 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.
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 rep
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.
ter-Builder@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 p
touch," 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?
- Original Message -
From: "Jack Taylor"
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
rious 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 Repe
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
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 spurious
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 a
CTED] On Behalf Of Randy
Sent: Wednesday, October 08, 2008 8:28 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Mitreks
How does one tell the differance between a High & Low power "and"
VHF or UHF Mitrek?
Thankyou
How does one tell the differance between a High & Low power "and"
VHF or UHF Mitrek?
Thankyou
> Collin
>
>
> -Original Message-
> From: Jim, K8COP <[EMAIL PROTECTED]>
> To: Repeater-Builder@yahoogroups.com
> Sent: Sat, 6 Sep 2008 4:20 pm
> Subject: [Repeater-Builder] Mitreks
>
>
>
>
>
>
> I have a stack of UHF/VHF/Lo Band Mitreks.
here too
Thanks !
Gary
- Original Message -
From: [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Sunday, September 07, 2008 11:10 AM
Subject: Re: [Repeater-Builder] Mitreks
Jim,
I you have trouble getting rid of a couple of VHF high band Mitreks I
Jim,
I you have trouble getting rid of a couple of VHF high band Mitreks I
will pay shipping.
Collin
-Original Message-
From: Jim, K8COP <[EMAIL PROTECTED]>
To: Repeater-Builder@yahoogroups.com
Sent: Sat, 6 Sep 2008 4:20 pm
Subject: [Repeater-Builder] Mitreks
I have a stack
I have a stack of UHF/VHF/Lo Band Mitreks. There is some cables, etc
with them. Free for pick up ONLY. Located near Muskegon, MI.
E-mail me direct [EMAIL PROTECTED]
Jim, K8COP
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