epeater-Builder@yahoogroups.com
>Subject: Re: [Repeater-Builder] Re: Duplexer tuning with an Oscilloscope
>
>w6nct wrote:
>
>> The other (not-so-intuitive) part to this is that it is often
>> difficult to do the tuning of a duplexer piece-meal; not impossible,
w6nct wrote:
> The other (not-so-intuitive) part to this is that it is often
> difficult to do the tuning of a duplexer piece-meal; not impossible,
> just difficult. What I mean by this is trying to tune one stage
> (cavity), then another, then another; and combining it all together
> into the ov
Hi Darrell,
Thanks for the info, try it one these good day, and let you know.
v44kai.Joel.
- Original Message -
From: "jistabout" <[EMAIL PROTECTED]>
Sent: Monday, June 23, 2008 3:13 AM
Subject: [Repeater-Builder] Re: Duplexer tuning with an Oscilloscope
-- --
The best instrument I used to tune a duplexer was and IFR spectrum anal with
built in tracking gen. It output a sweep and displayed on a large 9 inch
screen. Had tunable freq markers and was built machine. Let you know all that
was going on except the SWR/impedance. Could tell where all the
The one problem with using an scope for duplexer tuning most scopes have a
5V-5mv vert range. This is only 60 db, not near enough for duplexer tuning.
Using a diode detector reduces this even more due to diode drop. This is
getting down to using a Bird watt meter with a number of slugs to tun
Many years ago, I tuned up a set of 220Mhz homebrew duplexers with a
5Mhz scope. I built a 50 ohm load into an aluminum mini-box and placed
a diode inside the box near the load. I then used the scope to detect
the voltage developed by the diode as the power increased or decreased.
This was a
This would not be your typical audio frequency or 20 Mhz vertical
bandwidth scope, I suppose, I have used a Bearcat programmable radio
scanner and an FM10 for a generator to tune pass and reject. Steve NU5D
jistabout wrote:
> Hi Joel,
>
>
> Well, setup is quite simple - For example, if tuning
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