[TowerTalk] shorty forty

[Ve6wz_Steve]

Doug:

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: towertalk-bounces at contesting.com 
> [mailto:towertalk-bounces at contesting.com] On Behalf Of Doug Renwick
> Sent: Friday, November 12, 2004 8:02 AM
> To: towertalk at contesting.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?
> 
> Doug
> 
> 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 
> performance 
> > once tuned properly.
> > 
> > Keith NM5G
> 
> -- 
> Doug Renwick VA5DX
> PO Box 50, Clavet, Saskatchewan, Canada S0K 0Y0 
> VE5RA at 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.
> 
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