"Peter Hoon" <[EMAIL PROTECTED]> made an utterance to the drakelist gang ----------------------------------------------------------------------
> Dan, > You are correct, and I will likely do that next hamfest. In the mean time > it just seems like an interesting puzzle. Guess it is the Engineer in > me. Want to know what happened, what damage it did, etc. Ron, you can test the velocity factor of the "contaminated" coax you have and compare it to the expected value according to my MFJ-249 SWR Analyzer Instruction Manual as follows: Connect one end of your coax sample to the MFJ 249 or similar unit. Connect the other end with let us say 27 feet of coax to a fifty ohm resistor, between ctr and shield. You can coil up the coax on the floor. Measure precisely the length of your contaminated coax sample. Find the dip frequency using the 249 analyzer. For example, a 27 foot length has a dip frequency of about 7.3 Mhz. Divide 246 by the measured frequency. This gives you the free space one quarter wavelength in feet. Now, compute the velocity factor of your contaminated sample by dividing the free space one quarter wavelength by the actual feed line length. Compare the value you get for your contaminated sample with the velocity factor published in the transmission line chapter of the ARRL handbook (in my 1988 edition, it is on page 16-12). Of course, even if your sample tests good "velocity factor wise", your contaminated sample could "arc" when you put power into it and cause problems. Peter VE1CHS I plan to see > if the same thing has happened to the jumpers I have in service in the > shack. It may give me another indication as to what happened. Maybe some > time when I did some spray painting in the garage did something, or maybe > the gasoline for the lawn mower vented enough to cause an issue. > > Yes I am a stange one, hi. :-) > > 73, > Ron > > On Wed, 7 Dec 2005 [EMAIL PROTECTED] wrote: > > > Ron, why take a chance on a product, that has changed and, will likely > > change further from original, with no telling what the end result of that change > > will be. > ---------------------------------------------------------------------- > Submissions: drakelist@www.zerobeat.net > Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body > Hopelessly Lost: [EMAIL PROTECTED] - help in body of message > Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net > ---------------------------------------------------------------------- ---------------------------------------------------------------------- Submissions: drakelist@www.zerobeat.net Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net ----------------------------------------------------------------------
