[TowerTalk] Fwd: velocity factor?

[Hans Hammarquist via TowerTalk]

Thank you, guys, for all information.


It seems as the cable is OK and that the Vf is within range.


73 de,


Hans - N2JFS



-----Original Message-----
From: TexasRF <TexasRF at aol.com>
To: hanslg <hanslg at aol.com>; towertalk <towertalk at contesting.com>
Sent: Wed, Oct 8, 2014 4:33 pm
Subject: Re: [TowerTalk] velocity factor?



Hans, I have seen foam filled hardline with velocity factors in that range. Your loss test shows that the cable is ok.
 
73,
Gerald K5GW
 
 

In a message dated 10/8/2014 10:19:35 A.M. Pacific Daylight Time, towertalk at contesting.com writes:
Dear Ham   Friends,


Recently I checked my feed lines to my tower. I have 1"   hardlines, each 88 feet long. I checked the loss by measuring the SWR at   various frequencies. (~0.8dB @150MHz)


I decided to also check the   velocity factor. I was a little puzzled to get a factor of 0.8. Does that make   sense? It's a foam filled coax. I expected something around 0.9.   


My resonances were 2.2, 6.767, 11.228, 15.673, 19.945, 24.335,   resp. 28.53 MHz indication an electric 1/4 length of 33.73 meter or 110.67   feet. 88/110.67=0.795.


Any comments? Did I do anything wrong? The   coax were open in the other end. Does that give me the wrong   value?


73 de,


Hans -   N2JFS
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