hi guys would anyone know who sells impedance matchers in australia Thank you Ian Wells Kerinvale Comaudio mail service 1017, Biloela,4715. www.kerinvalecomaudio.com.au [EMAIL PROTECTED] ----- Original Message ----- From: "Eric Lemmon" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Monday, January 05, 2004 11:43 AM Subject: Re: [Repeater-Builder] SWR between radio and duplexer
> Adi, > > Both TESSCO and Talley Communications sell impedance matchers. The ones > made by EMR (www.emrcorp.com) and by Telewave (www.telewave.com) are > similar in construction, performance, and price (about US$70.) > > Very important! When tuning an impedance matcher, the wattmeter is > inserted between the duplexer and the antenna, not between the impedance > matcher and the duplexer TX input. I'm assuming here that your antenna > and feedline are a good match to the duplexer, so the power output > should not change when you remove the wattmeter. Actually, that's one > way to confirm that your antenna and feedline are a good match: Use a > Bird 43 or equivalent wattmeter connected at the duplexer's antenna > connector, to measure the power going into a dummy load right after the > wattmeter. Then, connect the antenna feedline in place of the dummy > load. Ideally, the forward power will be nearly the same. If there's a > lot of reflected power, you have a problem to investigate. > > The impedance matcher should always be attached as close to the > transmitter PA output connector as possible, for maximum benefit. And, > of course, it must remain in the circuit permanently. > > 73, Eric Lemmon WB6FLY > > Adi Linden wrote: > > > > > Where would I be able to find a "Z-Matcher" or how could I build one? I think I mentioned it before, this repeater is permanently located at my office and meant for experimenting. So this is the perfect place to learn. > > Playing with different cable lengths is an interesting idea. How would I > be able to find the cable that properly matches the PA to the duplexer, > when the meter inserted into the coax itself alters the cable length? > > > > > > Yahoo! Groups Links > > To visit your group on the web, go to: > http://groups.yahoo.com/group/Repeater-Builder/ > > To unsubscribe from this group, send an email to: > [EMAIL PROTECTED] > > Your use of Yahoo! Groups is subject to: > http://docs.yahoo.com/info/terms/ > > Yahoo! Groups Links To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ To unsubscribe from this group, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
