----- Original Message ----- From: "Michael Tondee" mat_62@netcommander.com To: "amsat-bb" amsat-bb@amsat.org Sent: Wednesday, June 04, 2008 2:33 AM Subject: [amsat-bb] Possible SWR problems with 70cm antenna
I'm having some problems with a homebrew lineasrly polarized "cheap yagi"
for 70cm. I don't have any success hearing myself on VO-52 or AO-7. This antenna used to work reasonably well for both. The way the power out meter on my radio acts, it leads me to believe I may have an SWR issue. Unfortunately I don't own or have access to an SWR meter or anylyzer capable of working at 70Cm.
I'm going to take a wild shot in the dark here and ask the bb because I
sure don't know. Would it be possible to put my 2 meter SWR meter in the 70cm line and at least get a ballpark figure of SWR? Or would the reading be so far off, it would be useless?
I'm not intending to try and tune the antenna in this manner, I just want
to get some indication as to if SWR is indeed the problem.
I must confess I don't know what the frequency range determining elements
of an SWR bridge are. I must have missed that at some point or the other.
Any other ways to determine if I have an SWR problem without a meter? It's
just not in the budget to buy one right now.
Any suggestions are appreciated. Tnx and 73, Michael, W4HIJ
Hi Michael, W4HIJ
To measure the VSWR with accuracy you can build by your self a set of inexpensive directional couplers ranging from 100 MHz to 10 GHz using semirigid coax cables as described into the RSGB Microwave Handbook Volume 2 pages 10.13 to 10.18
73" de
i8CVS Domenico