I have both the mfj antenna analyzer plus the matchmaker....the analyzer got
me the readings, and I use the matchmaker for touchup...that plus logging
the settings on my revamped johnson matchbox( used to be made by another ham
in wash state) gets me there nicely.
I just use my ten tec's omni 7 software to drop the rf gain down for
matchmaker tuning.
In this day and age, one would think there would also be some software that
would accomplish the same.
----- Original Message -----
From: "John Huffman" <hjohnc@gmail.com>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Monday, October 01, 2007 1:38 PM
Subject: Re: [TenTec] Tuning Rigs
> I've been using the MFJ Matchmaker and it does a good job. I really
> like being able to tune without putting a signal on the air.
> Previously, I used the Palomar Tuner-Tuner. It's the same theory, but a
> different implementation.
>
> The big difference is what happens when you screw up and transmit into
> the unit. The MFJ has a circuit to automatically by-pass. The Palomar
> has a 1/16 amp fuse. When using the Palomar, I had to stock up on the
> fuses :-)
>
> You do have to tune on the air to find the general settings of your
> tuner for the frequencies you normally use. You log those tuner
> settings. From then on you can use the Matchmaker to touch up the
> settings without putting a signal on the air.
>
> I find I have to have the attenuator on to use the matchmaker. Sure
> wish I the unit had an adjustment for the noise level it creates.
>
> 73 de K1ESE
> John
>
> Kevin Purcell wrote:
>> It could even be a useful retrofit into existing rigs -- especially
>> easy in rigs that run 50 ohm connections between separate boards.
>>
>> A minor problem I see of putting it in the receive line is there is
>> usually a LPF filter beyond the TR switch (shared between the Tx and
>> Rx) designed for 50/75 ohms. Given an 50 ohm load (or particularly a
>> reactive load) you might see a transformation through the LPF. But a
>> 50 ohm resistive load on the antenna connector will still look like a
>> 50 ohm resistive load on the other side of the LPF.
>>
>> Still it's easy to do: a resistive bridge, a pulsing noise source (or
>> even a continuous one, but the former is easier to hear) and some
>> switching in out (and turning off the noise source).
>>
>> On Sep 30, 2007, at 9:41 PM, Dr. Gerald N. Johnson wrote:
>>
>>> On Sun, 2007-09-30 at 20:54 -0700, Denton wrote:
>>>> I have very often wondered why these newer rigs do not have a
>>>> built in noise
>>>> bridge!
>>> It sure wouldn't be complex to do... just a bit of switching to insert
>>> in the line and it might well be the receive line so that it never had
>>> to see transmit power...
>>>
>>> 73, Jerry, K0CQ
>>
>> --
>> Kevin Purcell
>> kevinpurcell@pobox.com
>>
>>
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>>
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>
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