[Antennas] Re: increased ant bandwidths...

[Robert Lay (W9DMK)]

Dear Jack,

I'm with you 100% - there are very few antenna tuners hanging from the 
centers of dipoles, and yet that's where they are needed most.

My real point was that many people have serious misunderstandings of what 
the tuner does for you and what it does not do - thus leading to many 
misunderstandings about why so little of their power reaches the antenna.

73 de W9DMK - Bob Lay, Dahlgren, VA
http://www.zaffora.com/W9DMK/W9dmk.html
w9dmk at crosslink.net
----- Original Message ----- 
From: "Jack Painter" <223bthp at cox.net>
To: "Antennas reflector" <antennas at mailman.qth.net>
Sent: Saturday, April 29, 2006 2:50 PM
Subject: RE: [Antennas] Re: increased ant bandwidths...


> Bob and Roy,
>
> It sounds like you both agree that power output from the transmitter is 
> the
> only objective of any antenna tuner. What happens after that we have to
> accept if we want wider use of each antenna.
>
> If antenna tuners were placed at the feedpoint of the antenna, there would
> be little reflected power on the transmission line before it. An antenna
> coupler is always as close to the feedpoint as possible for this reason.
>
> When we want more tuning options in non-weatherproof assemblies right at 
> our
> fingertips (and inside the zone of our lightning protection system), we 
> have
> to accept the consequences. An inside antenna tuner still protects the
> transmitter and the operator, as long as we remember the output of the 
> tuner
> (like a coupler) is 'hot' in more ways than temperature.
>
> Regards,
>
> Jack
>
> -----Original Message-----
> From: Robert Lay (W9DMK)
>
>> Ordinarily RF power meters are located at the INPUT of an 'antenna
>> tuner.'
>>
>> 73,   Roy     K6XK
>
> Good point, Roy.
>
> We wouldn't want anyone finding out how little power comes OUT of the
> antenna tuner - that would discourage people from using them.
>
> Even worse would be to have an SWR meter on the output side of the tuner.
> Then they would really be pissed to see that the SWR does NOT CHANGE AT 
> ALL
> in the transmission line - Hi!
>
> 73 de W9DMK - Bob Lay, Dahlgren, VA
> http://www.zaffora.com/W9DMK/W9dmk.html
> w9dmk at crosslink.net
>
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