I've done it... you really need to make and install the status tone generators. For a while adapter circuits made for the task were available from a number of sources like RCA and Cetec Vega. Back in days of old I came into a small supply of the Cetec Vega units and we simply cloned them. (plus they had a killer audio compressor circuit.
If you really wanted to see the circuit, I might have a copy in my files... but you might have to buy me a cup of coffee at Dayton. :-) (light cream, no sugar). I'd probably send you the information even if you didn't buy me a cup of coffee. Also know that Motorhead came out with a modificiation to the Spectra Tac Current Generator Module, which improves the vote performance quite a bit. I also have that paper- work if you burn to have it. skipp > Kevin Custer <[EMAIL PROTECTED]> wrote: > > Hi Dan, > > Thanks for the response, but I'm looking for someone that has modified > the comparator for use outside the Motorola Spectra TAC environment that > has done away withe the need of continuous links and a status tone > (modified it for COS input) manually adjusted the AGC, but still utilize > most of the functionality of it. > > My linkback equipment is flat from 45 cycles to 5.5 kHz and I have > receivers at the repeater site that have a widened I-F to capture all of > the noise bandwidth I can get. The remote receivers are Hamtronics > R144's that have been modified for better squelch action. They feed > Hamtronics TA-451 exciters that have been retro fitted with a direct FM > modulator. Audio recovered from the receivers discriminator is > buffered, limited, and filtered at 5.5 kHz and fed directly to the FM > modulator. The deviation is set to a 5 to 4 ratio to preserve the > headroom. The linkback receivers are Hamtronics R451's that have had > some of the crystal filters removed and a slightly wider 455 I-F filter > replacing the original quite narrow one. > > Kevin > > Dan Babilla wrote: > > >HI Kevin, > > > >I use Spectra TAC Revievers (such as the C04RTB3108) as Link RXs stack at > >the same site as the Comparator and I directly wire them in within the same > >cabinet. In working on systems with these type of voting systems for many > >customers in the 80's -early 90's, I have found that the levels between > >receivers are very critical as are the levels between the audio and the > >status tone. Everything needs to be exactly the same for the Spectra Tac > >comparator to properly vote the best reciever signal. > > > >For best results use all the same remote recievers as well. Make sure the > >audio response of all reciever paths are adjusted the same, I use an OP amp > >circuits to tailor all audio down links to be completely flat across the > >link. I'm sure you already do that though. > > > >73's, > > > >Dan KA0OXH > > > > > >-----Original Message----- > >From: [email protected] > >[mailto:[EMAIL PROTECTED] Behalf Of Kevin Custer > >Sent: Wednesday, January 18, 2006 9:06 PM > >To: Repeater Builder; Micor List > >Subject: [Repeater-Builder] Operating a Spectra-TAC Comparator (Voter) > >without RX encoders. > > > > > >Hi, > > > >Need some opinions from folks that may be using the (newer) Motorola > >Spectra TAC Comparator as a stand alone voter, using RF links that don't > >transmit all the time. I have some theories on what to do, but I > >thought I would post to see what others have done. > > > >Please be as specific as you can. The comparator I have is the newer > >style that uses Signal Quality Modules that produce a voltage that > >corresponds with the quality of the signal received, not the 3 Micor > >squelch chips. > > > >Thanks in advance, > >Kevin Custer W3KKC > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
