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 of UHF/
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
I would be interested if you have any hi Power UHF 50-100w.
I would pay shipping etc.
Ralph, W7HSG
-- Original message --
From: [EMAIL PROTECTED]
> Jim,
> I you have trouble getting rid of a couple of VHF high band Mitreks I
> will pay shipping.
> Collin
>
>
> -
Randy,
A low-power Mitrek chassis has fins that are about 1/2" deep, while the
high-power units have fins that are about 1-1/2" deep.
A VHF high-band radio (150-174 MHz) will have a "3" as the third character
in the model number, as in T43JJA6900DK. A UHF radio will have a "4" in the
same locati
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
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
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
- 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
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?
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
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.
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
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.
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
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
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
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
> 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
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:
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
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
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
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
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