[TowerTalk] RG-149: 50 ohm/70 ohm - does it matter?

[Dan Schaaf]

Tom, the tuner does not fool me. I know exactly what it does. It presents a 
50 ohm impedance to my transmitter.

My antennas are resonant at one frequency per band, and of course deviate 
from resonance either +/- from that point. So, to get max usefulness across 
the band(s) I use the tuner. In my humble opinion, the least amount of 
reflected power getting back into my transmitter, the better for longevity 
of the transistors.



Best Regards
Dan Schaaf
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60 Meters www.60metersonline.net
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-----Original Message----- 
From: Tom Osborne
Sent: Saturday, December 14, 2013 12:10 PM
To: towertalk at contesting.com
Subject: Re: [TowerTalk] RG-149: 50 ohm/70 ohm - does it matter?

I think a tuner only fools people to think things are working right
(unless you use a Matchbox type tuner and twinlead).

If I have a RG-8X feeder, and I operate a 10 meter CW antenna at 28.900,
the amp may be happy and putting out it's power, but most will be
getting lost on the way to the antenna.

Yes, it will work, but not efficiently.  73
Tom W7WHY





> Jim
>
> I have an MFJ-998 Autotuner connected to the amp. Every time I change
> frequency I mouse click on the TUNE button on the screen, generate a
> carrier and the tuner does it's thing.
>
> So, do I have distortion? Not sure, but the tuner does present a good
> match to the amp. I do ask on the air about my signal, SSB, CW and RTTY
> and always get good reports. Short of having a scope connected to the
> coax, I assume that all is OK. Gone are the days of the Yaesu Scopes for
> testing transmitter/amp output. I used to have one in line but never
> seeing anything obvious on my signal, I finally got rid of it.
_______________________________________________



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