[TowerTalk] XM240 element lenght question

[Bill Parry]

Jorge,

I have an XM240 and I checked to see the swr, it is set for the CW portion.
I have had it up and down a couple of times for lightning strikes and at one
time used the "MID" measurements and found that the SWR rises much more
quickly in the CW portion of the band if I use that setting. My antenna is
about 40 meters high.

FREQ		SWR
7.000		1:1
7.050		1:11
7.100		1.3
7.150		1.5
7.200		1.9
7.250		2.1

I use an alpha amp and it starts to complain about the SWR at about 7200.
This measurement is using my FT2000 and reading it the best I can on the
little meter. I never get above 7200 so this setting works great for me. If
you are going to work more phone then you might want to use the mid
settings.

Bill W5VX

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Jorge
Diez - CX6VM
Sent: Sunday, May 04, 2014 2:20 PM
To: towertalk at contesting.com
Subject: [TowerTalk] XM240 element lenght question

Hello

 

XM240 manual say about CW, MID and PH lengths to make it resonant in 7025,
7125 or 7225 Mhz

 

What is the bandwidth? If I assemble it for 7025 Mhz, do you know SWR at
7.200 Mhz?

 

If I assemble it for 7.125 Mhz, do you know SWR at 7.001 Mhz?

 

Thanks,

Jorge

CX6VM/CW5W

_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk at contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk