Tom,
You say you find similar operation on 4 or 5 units. By that do you mean
they won't make book specification on any frequency below 146 MHz? If
that is the case, I would believe something is wrong. I have seen many
Mitrek high-band receivers that were tuned for 144 something and had
very good sensitivity.
Let me ask you this.... When tuned at 144.89, is the front-end tuning
all "one ended", or is there adjustment to spare? In other words, can
you tune the front-end without the fear of the tuning screws falling
into the casting? If you have room left to go lower in frequency, then
the front-end is not the problem, and you'll need to look elsewhere for
the lack of sensitivity. Another question - do these 4 or 5 units
tune and make book spec sensitivity on their original high-band channel?
I guess what I'm saying is I doubt the problem is the front-end helical
resonators, but if there is a need for a conversion I'm not opposed to
looking into making a modification available, if it is needed. If there
are others on the list that have had good luck with the Mitrek on
frequencies below 146 MHz, please chime in and let us know what you have
and how well it works.
Kevin
Hello Kevin
You are correct on your freqs for xmit and rcv. The Mitrek units
I have will only tune receive to 146.00Mhz. This leaves more than
one meg to go to meet tolerance on 144.890. I have tried 4 or 5 units
and find similar operation of all. This is the reason for my question
about the Micor coils working for Mitrek. Thanks. 73 de Tom Manning,
AF4UG
----- Original Message -----
*From:* Kevin Custer <mailto:[email protected]>
*To:* [email protected]
<mailto:[email protected]>
*Sent:* Tuesday, December 16, 2008 8:44 PM
*Subject:* Re: [Repeater-Builder] Holiday Special - MICOR 2 meter
receiver conversion from W3KKC
Tom,
Do you mean 144.89 MHz? I would think your repeater would
*transmit* on 145.490 MHz.... At any rate, no conversion is
necessary for the Mitrek to make book specification sensitivity on
144.890 MHz.
Kevin
Good afternoon Kevin
My need is to convert two or more Mitrek receivers to cover
145.49Mhzz, which is our receive freq for our repeater. Thanks.
73 de Tom Manning, AF4UG
----- Original Message -----
*From:* Kevin Custer <mailto:[email protected]>
*To:* [email protected]
<mailto:[email protected]>
*Sent:* Tuesday, December 16, 2008 12:19 PM
*Subject:* Re: [Repeater-Builder] Holiday Special - MICOR 2
meter receiver conversion from W3KKC
Tom Manning wrote:
Good morning Kevin
I have a question. Will these coils also work in a
Mitrek? Thanks. 73 de Tom Manning, AF4UG
Hi Tom,
To answer your question, the conversion will not work in the
Mitrek.
Unlike the MICOR, the Mitrek high-band unit that is most
common has a lower tuning limit of 146.00 MHz as specified
from the factory. This means that the units normally tune
anywhere in the 2M ham band without modification. What
frequency do you need to listen on?
Kevin
