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 > > > > > > > > > > > > > Yahoo! Groups Links > > > [EMAIL PROTECTED] > > > > > __________________________________ Yahoo! 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