I used one and never did hook up a dummy load. All it does as i recall
is add capacatance across the line. I never had much luck with mine.
It would let the rig tune, but no one could ever hear me. If I
remember, there is a position where it is out of the circuit
73
Butch
WA0VJR
Node 3148
Wallace, ks.
On Mon, 28 Jul
2014, Tom Behler wrote:
> Hi again, everyone.
>
> In line with what I discussed on the list several weeks ago, I have just
> purchased and received the MFJ 914 auto-tuner extender for my TS480 HF set
> up out at the RV.
>
> I use an Alpha Delta DXCC HF antenna out there, and have had good luck with
> it so far. The rig's internal auto-tuner tunes on all of 40, 20, 15, and
> 10 meters.
>
> My rationale for the purchase centered around the idea that I might be able
> to extend the TS480's auto-tuner range on 80 meters. The DXCC tunes well in
> the middle 150 KHZ of the band, so I'm hopeful the auto-tuner extender can
> extend my range a bit on either side. It may be stretching it, but I'm
> hoping that it can get me down to the CW portion of 80 meters for this
> weekend's NAQP CW contest.
>
> It would be nice too if the extender could help me tune the DXCC on 30
> meters, but that also remains to be seen.
>
> Anyway, one of this week's projects will involve getting the unit set up and
> tested.
>
> But, I have a question.
>
> In the manual, it says that you should connect a dummy load and an RF ground
> to the tuner extender, to ensure protection of your rig. I understand the
> reasoning behind the RF ground, and will make up that connection, as I do
> for any of my station equipment. However, the need for a dummy load for rig
> protection is not totally clear to me in this case.
>
> Here's what the manual says:
>
> "The MFJ-914 connects in-line between your transmitter and antenna.
> Connect your transmitters antenna output to the SO-239 connector
> labeled Transmitter, and your antenna to the Antenna connector. For
> maximum protection of your tranceiver, a 50 Ohm dummy load should be
> connected to the plug labeled Dummy Load, and the Ground stud
> connected to a good RF ground."
>
>
> My original plan was to work with the auto-tuner extender on low power, say
> 10 or 20 watts, and then increase the output power to 100 watts before any
> qsos on the needed bands.
>
> Am I on relatively firm ground here?
>
> Tom Behler: KB8TYJ
>
>
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