Richard.
A couple of basic points.
Check the TX output into a 50 ohm DL via a SWR meter to verify a match, and
if necessary check rf current.
Resonate the antenna to the reqd freq and with your atu match it to50 ohms.
If both are spot on then you have achieved the object, at least you have a
bench mark.
If coax is suspect check it also.
g3kev
----- Original Message -----
From: "Richard Newstead" <[email protected]>
To: <[email protected]>
Sent: Friday, May 15, 2009 5:01 PM
Subject: LF: Aerial current
After my success in getting more current into the aerial yesterday I
decided to measure the RF current in the link (link coupled ATU) with a
proper RF ammeter. I was somewhat surprised that the current pinned my 1
Amp RF meter. How can that be? I can think of some possible reasons:
1) The meter is wrong (it must be nearly 70 years old)
2) The impedance is not 50 Ohms which is odd because I assume the TX is
designed to have a 50 Ohm output and I carefully adjusted the link for
maximum power transfer last night).
3) The transmitter is giving out far more power than expected (seems
unlikely).
Any ideas?
Incidentally, am I best to measure current in the link or in the aerail
wire?
73
Richard
PS - beacon on again 501.6kHz.
--------------------------------------------------------------------------------
No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 8.5.329 / Virus Database: 270.12.30/2115 - Release Date: 05/14/09
17:54:00
| 