[AMRadio] 10M AM Frequencies

Fri Sep 23 14:13:27 EDT 2011

I have up a double Bazooka for 10 it werks very well.

73
Jack
KA3ZLR

________________________________
From: Paul Baldock <paul at paulbaldock.com>
To: Discussion of AM Radio in the Amateur Service <amradio at mailman.qth.net>
Sent: Friday, September 23, 2011 11:55 AM
Subject: Re: [AMRadio] 10M AM Frequencies

At 04:43 AM 9/23/2011, Mark K3MSB wrote:

>But, remember the original premise of this thread was not the need to
>alleviate overcrowding on 10M AM;  it was that antennas not cut for 29.0
>have a hard time being used on 29.0 -- and that was pretty much shown to be
>a non-issue.

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

- Paul

>No evidence has been presented that overcrowding exists between 29.0 and
>29.2,  so the spread out "solution" is a solution in search of a problem.
>
>With several people indicating they work AM amongst SSB activity lower in
>the band with no problem is yet another indication that parallels between
>75M and 10M are not valid.
>
>Off to work.....
>
>73 Mark K3SMB
>
>On Fri, Sep 23, 2011 at 7:36 AM, Ed Sieb <esieb at sympatico.ca> wrote:
>
> > I simply don't understand the need for such Byzantine and complicated
> > band-plans and
> > regulations  as you have them in the U.S.  What is wrong with the way we
> > have it up here?
> > Once a radio amateur has access to HF, he has access to all of HF,  no
> > sub-bands.  We can
> > operate any mode, anywhere. You want to run phone on 3510?  Go right ahead!
> >  Though it is
> > recommended that one adhere to conventional "gentlemen's agreements".
> >
> > As  for newly minted, ex-CB'ers  running AM - good luck with that.   Most
> > "expert" and
> > "elite" CB'ers  disdain AM and consider it low class.   That newly minted
> > Tech will use
> > SSB only as he has been acculturated to use SSB on the freeband.  Yes,
> > freeband.  Where
> > did you think all these Technician class' came from?
> >
> > Ed, VA3ES
> >
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