As luck would have it, this meter did not come with the probe, he sold the probe seperate. So now I am back to square one, will just have to do it with the SA and see what happens there.
Mathew
"Bob M." <[EMAIL PROTECTED]> wrote:
Thanks. I'll take your word for it that we've talked
before!
I'm not the one with the station, Mathew Quaife is.
His is a CLB and I don't know if it has a TTRC, or if
the station connector exists on his unit. Right now
he's having other problems trying to get all the
alarms to go away. I think they will once he gets the
filter/duplexer tuned up and gets the right amount of
loss through it.
That probe kit was quite a deal. You were lucky. At
least the HP units don't have a removable probe, so
they tend to come with one, although they're usually
missing all the slip-on adapters and tips. I have one
here right now with a bad probe, and naturally no new
ones are available from Agilent any more.
Bob M.
======
--- Gary <[EMAIL PROTECTED]>wrote:
> Hi Bob! Long time, since I spoke to you. On the CXB
> station there is
> a transmit disable input on station connector J2-5.
> (comes from TTRC
> P2900-4) A low applied there will inhibit all
> transmit activity. I
> did this on my 440 machine with just a simple DTMF
> board to comply
> with the remote knockdown requirement. This way, I
> could continue
> using the internal controller. (better sounding
> audio, than any
> external controller, in my opinion)
>
> By the way, I have a Ballantine 3440A RF
> millivoltmeter. I aquired
> the meter, and the complete RF probe kit, for it off
> ebay. The meter
> was $50, and the big suprise was the RF probe kit. I
> got it for $30,
> and it was basically brand new. Ballantine lists
> this probe kit for
> $900+! Was my lucky day!
>
> Gary KB7TRP
>
> --- In [email protected], "Bob M."
> <[EMAIL PROTECTED]>
> wrote:
> >
> > Boonton makes some nice instruments. Just make
> sure
> > the RF probe comes with it (they plug in and are
> often
> > not included), and that the unit is guaranteed to
> be
> > working. You don't need to measure the exact
> > amplitude, you only need to detect the peak and
> dips
> > as you tune the filter coils.
> >
> > The stations can be set up to repeat, do CW ID,
> and
> > even time out, if programmed correctly. On/off
> control
> > is the primary item you'll need to provide from
> the
> > outside world, and I don't think there was an easy
> way
> > to do it (i.e. they didn't just give you a signal
> you
> > could ground to disable the transmitter). I found
> it
> > was just easier to do everything with an external
> > controller, and this gave me the ability to put in
> an
> > audio delay module at the same time. However, I
> will
> > say that the interfacing is not as simple as
> plugging
> > something in and running with it; significant
> > technical prowess would be required to do the job
> > successfully. My station was a CXB that programs
> with
> > a PC and RSS, so changing parameters is a whole
> lot
> > easier.
> >
> > Bob M.
> > ======
> > --- Mathew Quaife <[EMAIL PROTECTED]>wrote:
> >
> > > 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 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 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
> >
> >
> >
> >
> > __________________________________
> > Yahoo! Mail - PC Magazine Editors' Choice 2005
> > http://mail.yahoo.com
> >
>
>
>
>
>
>
>
>
>
>
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>
>
> [EMAIL PROTECTED]
>
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>
>
>
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