power, and still has some notes
on how they did any matching, etc.
Larry
-Original Message-
From: Eric Lemmon [EMAIL PROTECTED]
Sent: May 10, 2005 6:26 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Micor mobile transmitter
Bruce,
Although you can disconnect half
notes on how they did any matching, etc.
Larry
-Original Message-
From: Eric Lemmon [EMAIL PROTECTED]
Sent: May 10, 2005 6:26 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Micor mobile transmitter
Bruce,
Although you can disconnect half of the four final
I have not done this on a 420 Micor, but I have on a
450 Micor, which is essentially the same.
As Neil pointed out, all the interstage coupling is
done at 50 ohms, so you only need to decide how much
power you need, and modify accordingly.
The controlled stage will put out 2 to 7 watts, if you
I agree with Neil's comments, and have had similar experience and luck
doing so.
There really isn't anything to it, much easier than the Hack-Saw 10
watt VHF IPA
Kevin
Neil McKie wrote:
Although I haven't experimented with the 406-420 Micors, I have
done some trouble shooting on the
Larry - I've taken 450-470 MHz Micor 25 watt mobiles ran them on
only the pre-driver to get about 9 watts out (I bypassed the rest of the PA
deck). I also had to bypass the power control board to make it work reliably.
-- Original Message --
[EMAIL PROTECTED] wrote:
I have a
Why did I get this in response to posting on this list??
Forwarded message is attached.
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What is the best way to reduce power on a 100 watt micor mobile for
repeater use? I have redused the voltage in to 12.8 volts and have
developed a cooling system on the P.A. deck that has constant air flow
over the circut board as well as the the heatsink.
Thanks, Bruce KD4BOH.
Hi There!
Micor mobiles do not like be lowered below 2/3 rated output.. they like to go boom!
I had a couple of 100 watters that both went funny even thought I had them in the 60-65 watt range. they were replaced with 40 and 60 watters and those micors are still playing today. I have
Bruce,
Although you can disconnect half of the four final transistors and change
the matching components appropriately to have a 50 watt PA, it's better to
simply exchange the 100W amplifier board for a lower power board. I'm
guessing that you could probably find someone to swap boards with,
on this machine.
Wide area crossband 8 rx site system.
Thanks again guys, Bruce KD4BOH.
- Original Message -
From: Eric Lemmon [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Tuesday, May 10, 2005 8:26 PM
Subject: Re: [Repeater-Builder] Micor mobile transmitter
Bruce,
Although
brucenanney wrote:
What is the best way to reduce power on a 100 watt micor mobile for
repeater use? I have redused the voltage in to 12.8 volts and have
developed a cooling system on the P.A. deck that has constant air flow
over the circut board as well as the the heatsink.
Thanks, Bruce
Bruce Nanney wrote:
Thanks Eric and Brian for the info. I've been able to run it for 10 yrs @110
watts on 145.270 without any problems in an air conditioned environment. But
I'm moving it to a remote location without a/c. I guess I will leave it as
is, as I need the power as much as I can get.
One time a few years ago, one of the now lurkers on this remailer,
brought his 100 watt high-band Mocom-70 to me to tune up for him.
On a lark, I decided to run it wide open in this case with 16
Volts DC. Wide open, the 100 watt transmitter put out 240 watts.
Ran my 100 watt
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