I used to have a Tuner-Tuner (fixed 50 ohm noise bridge) but kept
blowing the fuse by transmitting through it.
Now have an MFJ-212 Matchmaker. Same concept but with auto-bypass and a
momentary ON button.
These devices are great for my setup. I use the Matchmaker to tune my
tuner for flat SWR. No signal on the air, no stress to the rig, no QRM.
My amp is an Ameritron ALS-600 Solid State No-Tune amp. So, the tuner
that is adjusted with the Matchmaker is ready for either the exciter or
the amp.
Even the second or two of transmission using an auto-tuner bugs me. The
frequency may sound clear, but I may be QRMing someone inside my skip zone.
This system has been fast and easy for me. YMMV.
73 de K1ESE
John
Dr. Gerald N. Johnson wrote:
> On Mon, 2007-08-06 at 15:11 -0500, Stuart Rohre wrote:
>> All,
>> Always tune up a rig and linear and tuner into a dummy load before applying
>> an antenna. Then, you should have less range of adjustment to fine tune the
>> tuner to the antenna.
>
> Only if the antenna is near resonance. Otherwise the tuner should be
> pretuned with an antenna analyzer or noise bridge or tuner tuner (fixed
> Z noise bridge. The rig and linear used with that tuner should be tuned
> into a dummy load and all that tuning can be facilitated by keeping a
> tuning chart with good logging dials on the adjustable components.
>
> I find peaking receive through the tuner speeds adjustments when I've
> neglected to look at my tuning chart.
>> And, if possible, use an antenna analyzer to make sure the tuner settings
>> are either correct for the intended antenna, (separately with the linear
>> disconnected), or tune the antenna using the antenna analyzer as the source.
>>
>> That minimizes the on air time of the linear while tuning up. Actually, the
>> goal is to NOT tune up the linear on the air.
>
> For sure, but when the only tuning instrument is a SWR bridge that runs
> at full transmitter power, tuning on the air will be done.
>> 73,
>> Stuart
>> K5KVH
>
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