The unit that I got is the Boontoon RF Millivoltmeter Model 92E. Looks like it should cover what I need it to do. Thanks for the help, when it gets here, I am certain I will have more questions until this repeater is up and fucntional, and then comes the fun of tying in an outbord controller for the unit. Thanks.
Mathew
"Bob M." <[EMAIL PROTECTED]> wrote:
There will be some loss in the filter (maybe 0.5dB per
section), and about 30dB loss when using the tuning
probe. If you're feeding in 223mV (0dBm), you would
probably measure -30dBm using the RF voltmeter
connected to the tuning probe, when the filter is
fully peaked. This is around 7mV. However, even when
the coil is mis-tuned, you'll still get some
indication with the proper meter. It'll be harder to
see with a spectrum analyzer because of its low
impedance input.
I use an old HP3406A sampling (RF) voltmeter. They
show up on eBay once in a while, but you can't get
parts for them any more, so if it doesn't work, it's
difficult to repair unless a common part has failed.
Mike (ILQ) please contact me.
Bob M.
======
--- Mathew Quaife <[EMAIL PROTECTED]>wrote:
> Hi Mike, did a little research and found one in
> Chicago. I knew about the SM, just never thought of
> one being outside the SM. So should have one here
> in a few days, and then get back to working on the
> repeater.
>
> Mathew
>
>
> Mike Morris <[EMAIL PROTECTED]>wrote:
> At 05:13 AM 11/13/05, you wrote:
>
> >Sitting here looking at the tune up procedure for
> the filter, it tells me
> >to insert a rf millivoltmeter probe into J18 and
> insert a 225 mV signal
> >into the the output of the post filter. I did this,
> and get nothing on
> >the meter at all.
>
> It takes a LOT of level to force a signal past a
> detuned filter.
>
> >Now I'm not sure if there is a difference between
> my RS Volt-Ohm meter and
> >an RF millivoltmeter.
>
> Your RS VOM does have an AC mode, but I'd be
> surprised
> if it responds to frequencies above 100khz. If it
> responds to
> 447MHZ RF at all, I'd be very, very surprised...
>
> An RF millivoltmeter is just that - a meter that
> reads at RF
> frequencies down to the millivolt (and frequently
> microvolt)
> levels.
>
> If you think about it a service monitor and a
> spectrum analyzer
> both have the function as RF millivoltmeters... when
> you measure
> receiver sensitivity you are injecting a low level
> RF signal into the
> receiver, and the RF millivolt / microvolt meter
> section is reading
> the result.
>
> Mike WA6ILQ
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