thanks very muchfor the information
i do have a spectrum analyzer hp8558b and a wavetec 3000 servicemonitor
thanks ian
- Original Message -
From: Eric Lemmon [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Friday, November 28, 2003 1:25 PM
Subject: Re: [Repeater-Builder] Tuning cavity filters
Ian,
Of the two methods you propose, the first is better by a long shot. It
is never a good idea to transmit into an untuned duplexer, for any
purpose.
If you don't have access to proper duplexer tuning equipment, such as a
network analyzer or a spectrum analyzer with tracking generator, the
receiver s-meter method is crude but will get you close. The down
side is that this method lacks the great sensitivity and precision
attainable with a network analyzer- the instrument of choice with
duplexer manufacturers.
Perhaps the best advice I can offer is to contact the manufacturer of
your duplexer, and ask for a copy of the field tuning instructions.
There is no single standard procedure for tuning duplexers, so it
helps to know what method is recommended by the firm that built it.
73, Eric Lemmon WB6FLY
Ian Wells wrote:
...When tuning cavity filters, which is the best way of alignment-
having a signal generator hooked up to the tin with a radio with signal
strength meter on the other side, or transmitting on the radio with an
swr meter in line with tin into a dummy load?...
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