I found that my XM-240 when tuned for around 7.063 was useable from
7.000 to 7.250.
I'm not sure you would really need a switch box.
BTW...the bandwidth of this Yagi is so broad mostly because of the way
it is tuned...the max. F/B is actually way below the design frequency.
You can improve the F/B and increase the gain somewhat by making the
reflector element a bit shorter. However, because this increases the
mutual coupling, the feedpoint impedance goes down (you need to add a
small hairpin match at the feedpoint) and the SWR bandwidth goes down.
73, de steve ve6wz
> -----Original Message-----
> From: email@example.com
> [mailto:firstname.lastname@example.org] On Behalf Of Doug Renwick
> Sent: Friday, November 12, 2004 8:02 AM
> To: email@example.com
> Subject: Re: [TowerTalk] shorty forty
> Has anyone successfully added a CW/SSB relay box to the
> driven element of the Cushcraft XM240? And if so, how did you do it?
> Keith Dutson wrote:
> > I have two of the F12 antennas. Both have the relay box for CW/SSB
> > switching. They were difficult to tune, but offer stellar
> > once tuned properly.
> > Keith NM5G
> Doug Renwick VA5DX
> PO Box 50, Clavet, Saskatchewan, Canada S0K 0Y0
> VE5RA@sasktel.net First VE5 9BDXCC What profit it a ham if he
> gains all the awards yet forfeits his soul? I'll run the race
> and I will never be the same again.
> See: http://www.mscomputer.com for "Self Supporting Towers",
> "Wireless Weather Stations", and lot's more. Call Toll Free,
> 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
> TowerTalk mailing list
> http://lists.contesting.com/mailman/listinfo/t> owertalk
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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