[TowerTalk] Fwd: In Shack Tuner Vs. Remote Tuner for Multi-BandAntennas

[Hans Hammarquist via TowerTalk]

Dave, If you by "tuning to resonance" means adjusting antenna AND tuner to achieve a resistive load (preferable 50 Ohms) at the transmitter feeding point, yes you can say that you tune your antenna to resonance by an antenna tuner regardless where the tuner is located. If you "look" at what impedance the tuner is "creating" at the feed-point of the antenna you will find that the tuner (plus the effect of the transmission line) will show a reactance equal in size but opposite sign to the reactive part of your antenna feedpoint impedance. That's the definition (I believe) of resonance.


Anyone, correct me if I'm wrong.


Hans - N2JFS



-----Original Message-----
From: WA3GIN in King George, VA <wa3gin at comcast.net>
To: jim <jim at audiosystemsgroup.com>; towertalk <towertalk at contesting.com>
Sent: Sat, May 3, 2014 7:47 am
Subject: Re: [TowerTalk] In Shack Tuner Vs. Remote Tuner for Multi-BandAntennas


When did matchbox or coupler get replaced with tuner?

I thought a tuner was what was used to TUNE-IN AM and FM broadcast stations 
or one TUNES a VFO --- aren't these devices coupling RF from the feed-line 
to the feed-point of the antenna?  They aren't adjusting the resonance of 
the antenna, so what are they tuning?  ;-))

Have Fun,
dave
wa3gin

----- Original Message ----- 
From: "Jim Brown" <jim at audiosystemsgroup.com>
To: <towertalk at contesting.com>
Sent: Saturday, May 03, 2014 3:41 AM
Subject: Re: [TowerTalk] In Shack Tuner Vs. Remote Tuner for 
Multi-BandAntennas


> On 5/2/2014 11:54 PM, Roger (K8RI) on TT wrote:
>> Technically the tuner at the antenna is better, but with good coax and 
>> low bands it's hardly worth the effort, but look up the chart in the 
>> handbook for additional loss Vs SWR at a given cable loss. Basically, at 
>> 160, 75, and even 40, it makes little difference whether the tuner is in 
>> the shack or remote.   Unless it's a long run, if you are using good, low 
>> loss coax, the difference is likely only a few tenths of a db.  Look up 
>> transmission line basics  (20.1) in the current 2014 book.  This chart 
>> has been in there for years, so if you have a different version, just 
>> look gor transmission line basics.
>
> YES, YES, YES.
>
> 73, Jim K9YC
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