[AMRadio] 10M AM Frequencies

[Jack Dayton]

Hi,

And it;s VSWR 



73
Jack
KA3ZLR



________________________________
From: Bernie Doran <qedconsultants at embarqmail.com>
To: Discussion of AM Radio in the Amateur Service <amradio at mailman.qth.net>
Sent: Friday, September 23, 2011 1:49 PM
Subject: Re: [AMRadio] 10M AM Frequencies


----- Original Message ----- 
From: <manualman at juno.com>
To: <amradio at mailman.qth.net>
Sent: Friday, September 23, 2011 1:16 PM
Subject: Re: [AMRadio] 10M AM Frequencies


> My 4 elements on 10 meters are adjusted for best at SWR at around 28.7
> MHz. The SWR increase at 29.1 and 28.3 isn't enough to be me excited. The
> tube rigs don't care and the solid-state rigs all have antenna tuners. On
> 10 meters, I can find phone DX all over the band. I can't stand that
> dit-dit stuff so I don't operate below 28.3.
> 
> Pete, wa2cwa
> 
> On Fri, 23 Sep 2011 08:55:02 -0700 Paul Baldock <paul at paulbaldock.com>
> writes:
>> It certainly is an issue. A typical 4 element yagi that is tuned for 
>> 
>> 28.3MHz will have about 6dB less gain at 29.2MHz than at 28.3MHz. No 
>> 
>> antenna tuner can compensate for that. Also the front to back is 
>> less 
>> than zero - ie it points backwards. A 100ft of RG213 is about 1.2dB 
>> 
>> loss, a 3:1 SWR adds another 1.2dB, add 1dB for your tuner, and that 
>> 
>> adds up to about 10dB down at 29.2MHz. 100W is now worth about 10W. 
>> 
>> That's a big difference when you are trying to work DX and AM.
>> 
>> - Paul
>> 
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