Menu

Using Tuner to Determine Line Input Impedance

Search this Thread

Prev

Previous Post

Next Post

Next

#5

Report Post

Old

June 3rd 09, 11:19 PM posted to rec.radio.amateur.antenna

Owen Duffy Owen Duffy is offline

Owen Duffy is offline

external usenet poster

First recorded activity by RadioBanter: Dec 2006

Posts: 1,169

Default

Using Tuner to Determine Line Input Impedance

dykesc wrote in news:22d6efc6-76ca-487a-9fc1-
:

....
I am concerned about an RF field from a local broadcast that may be
causing issues with using the low power MFJ 259B. When I use the auto
tuner I am tuning at 10 watts so plenty to counteract any local rf on
the antenna. I really need to back calculate an impedance from the
inductor, capacitor, and final swr from the auto tuner.

Why didn't you say that the first time?

Tom Rauch (one of the designers of the '259B) posted this info re
interference:

"BC interference causes the bridge in the analyzer to remian (sic)
unbalanced even with very low SWR, so the analyzer will read a fixed
minimum SWR when BC interference. It will read that way on any frequency
from dc to daylight. For example if the unit falls asleep the SWR meter
won't drop to zero. That's an indicator of BC interference or external
voltages being applied to the measurement port."

Owen

Reply With Quote

Reply With Quote

Thread Tools	Search this Thread
Show Printable Version	Search this Thread: Advanced Search
Display Modes
Switch to Linear Mode Switch to Hybrid Mode Threaded Mode

Posting Rules
Smilies are On [IMG] code is On HTML code is Off Trackbacks are On Pingbacks are On Refbacks are On

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
LS-3 speaker input impedance	Lou D[_2_]	Boatanchors	4	July 31st 07 03:37 PM
Antenna Input Impedance	[email protected]	Antenna	4	December 19th 05 08:27 PM
[OT] Rcvr antenna input impedance	Toni	Antenna	17	September 21st 04 05:29 PM
NEW PROGRAM - Input Impedance & SWR of Resonant Antenna.	Reg Edwards	Antenna	0	April 1st 04 01:40 AM
Sony input impedance	mike	Shortwave	4	September 9th 03 08:41 PM

All times are GMT +1. The time now is 05:01 AM.

About Us

"It's about Radio"

Contact Us RadioBanter forum home Privacy Statement

Copyright © 2017