Hi, I tried that with the Maxtrac, kept the oscillator on and keyed the TX at the second driver stage, but it was still nowhere close. I know the Maxars are used quite a lot for beacons, but I've had no luck finding one at a reasonable price, so figure to try the Mitrek. It's set now at 49.3 MHz, so it's already not far from the beacon subband.
--- On Sun, 8/29/10, Jeff DePolo <[email protected]> wrote: From: Jeff DePolo <[email protected]> Subject: RE: [Repeater-Builder] dumb question: what is purpose of lock on Mitrek? To: [email protected] Date: Sunday, August 29, 2010, 3:48 PM I'm assuming this is a CW beacon? I would think that whether rockbound or synthesized, you'd probably be best off having the oscillator running all the time and keying RF at a gain or multiplier stage. You might have to do some keying waveform shaping to avoid "keyclicks". I'd take a real close look at the output spectra with something capable of catching transients or any spurs that occur during the keying ramps; maybe key it on/off at a rapid rate repeatedly while doing a peak-hold with the SA for a few minutes to look for any anomalies as a first pass. --- Jeff WN3A > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Jeff KP3FT > Sent: Sunday, August 29, 2010 1:16 PM > To: [email protected] > Subject: RE: [Repeater-Builder] dumb question: what is > purpose of lock on Mitrek? > > > > Thanks guys. Looks like this radio might work; need > something for a 6-meter beacon transmitter. Tried a Mocom > but it wasn't functional. Tried a Maxtrac but the carrier > was really squirrely even when I tried the various mods, must > be due to the PLL instead of crystal-control. Have to see > how the carrier sounds on the Mitrek; if it's good I'll have > one of the TX channel elements re-crystalled. Been trying to > get something for a 6-meter beacon that doesn't cost a > fortune, on and off for the past few years between other > projects, and finding it a lot more difficult than it was > finding a suitable 10-meter beacon transmitter! Learning a > lot in the process though, that's a good thing... > 73 > Jeff KP3FT > > --- On Sun, 8/29/10, Eric Lemmon <[email protected]> wrote: > > > > From: Eric Lemmon <[email protected]> > Subject: RE: [Repeater-Builder] dumb question: what is > purpose of lock on Mitrek? > To: [email protected] > Date: Sunday, August 29, 2010, 12:56 PM > > > > > Jeff, > > The reason that most trunk-mount radios are locked is > to prevent theft and > tampering. The lock has no electrical function. You > will need the > ubiquitous #2135 key to unlock your Mitrek drawer. You > definitely want to > open up the radio before applying power to it, so that > you can ascertain if > the channel elements are in place, and what optional > components are > installed. Since Motorola shipped two keys with every > radio sold, most > radio shops will have a drawer full of #2135 keys. If > you ask, you will > likely get one or two free. > > 73, Eric Lemmon WB6FLY > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of KP3FT > Sent: Sunday, August 29, 2010 9:09 AM > To: [email protected] > Subject: [Repeater-Builder] dumb question: what is > purpose of lock on > Mitrek? > > Hi, > I know it's a dumb question, but after scouring the > internet for info, I > find everything about locks and replacement keys for > Motorolas and other > radios, but I still don't know what locking the Mitrek > actually does. Does > it kill all power to the radio, or disable certain > functions? I'm asking > because I just acquired a low-band Mitrek that I need > to power up and verify > its working condition. It doesn't have a control head, > so I need to use the > front panel pins, but if the radio is locked, I may end > up getting nowhere > and still not know if it's either the radio that is > bad, it is locked out, > or I wired it wrong. This is the first Mitrek I've had. > Thanks for any help. > Jeff KP3FT > > > > > >
