John, If you run across any 406 - 420 MHz Micors or Mitreks I could use one or two of each.
Thanks, Joe --- In [email protected], "La Rue Communications" <laruec...@...> wrote: > > Mike - > > Thanks for that snippet. Thats the reference I was referring to when I > determined it was non frequency dependent. With the absence of further > responses from the group, I will consider my answer confirmed. Thank you all > for your time! > > *This unit came out of service from a UHF repeater. There are no channel > elements but I guess it can be used for VHF stations as well with a simple > board change, right?* > > John Hymes > La Rue Communications > 10 S. Aurora Street > Stockton, CA 95202 > http://tinyurl.com/2dtngmn > ----- Original Message ----- > From: Mike Morris > To: [email protected] > Sent: Tuesday, June 01, 2010 2:45 PM > Subject: Re: [Repeater-Builder] Chassis Question > > > > At 11:01 AM 06/01/10, you wrote: > > > > Gentlemen - (And Ladies) > > I have a Micor Unified Chassis here model TCN1187A. Am I right in > confirming that this Chassis is not frequency dependent? There are no channel > elements in this unit so I cannot confirm what frequency is would work for. > Can anyone shed some detailed light on this unit for me please? > > Thanks! > > John Hymes > La Rue Communications > 10 S. Aurora Street > Stockton, CA 95202 > http://tinyurl.com/2dtngmn > > > Most any frequency dependent part in a Micor > (actually most any Moto radio) is marked with > a part number in the format of three letters > and 4-digits, possibly followed with a revision > code... Like TLD8272B1... > > The secret is the third letter. The text below is cut > and pasted from > < http://www.repeater-builder.com/motorola/aaannnn-numbering-scheme.html > > > Mike WA6ILQ > > A Under 25 MHz > B 25-54 MHz (yes, the table in the buyer's guide included 10 meters and 6 > meters) > C 72-76 MHz (see note 1) > D 144-174 MHz (see note 2) > E 406-470 MHz (see note 3) > F 890-960 MHz > N Not frequency dependent (like an audio-squelch board, or a power supply) > (see note 4) > > NOTES: > [1]: C was limited to the 72-76 MHz USA assignment (one split) until > Motorola started making land mobile equipment for the European 66-88 MHz band > (which usually required two splits). Some books say that the so-called "mid > band" is 60-99 MHz. There is no 30-50 MHz low band in Europe, when they refer > to low band they are referring to 66-88 MHz. > > In the USA, 60-66 MHz is television channel 3, 66-72 MHz is TV channel 4, > the 72-76 MHz frequencies are used as "Operational Fixed / Repeater" > frequencies (essentially commercial point-to-point links), 76-82 MHz is TV > channel 5, 82-88 MHz is TV channel 6, and 88-108 MHz is commercial FM > broadcast. One rumor is that as part of the HDTV conversion in the USA the > FCC and the military want to eliminate TV channels 4, 5 and 6 then reassign > the 66-88 MHz range as a military band that aligns with the rest of the world > (i.e. for joint operations and exercises). > > [2]: D was redefined downwards to 136 MHz at some point. There are high > band equipment models specified as 136-174 MHz, and others that are 150-174 > MHz. > > [3]: E was redefined downwards to 390 MHz in the early 70s and then to 360 > MHz in the early 80s for certain military, government and spook equipment. It > was expanded upwards to 490 MHz and later to 512 MHz as the 470-494 MHz then > 494-512 MHz frequencies were allocated. A 1990s salesmans order book has the > UHF band listed as going from 400 MHz to 520 MHz. There has also been some > "interesting" equipment found on frequencies as high as 550 MHz. > > [4]: N is still used as a "Not frequency dependent" identifier even when > there is some difference between wideband and narrowband equipment (like in > the audio recovery circuitry in an IF / discriminator board). Most of the > time a variation like that is handled in the final letter suffix (i.e. a > TLN9999A1 might be wideband and a TLN9999A2 might be narrowband), but there > are exceptions. > > The four numbers after the three letters are simply a design sequence > number. One or two letters after the numbers are a version, variation or > revision identifier (the term used depends on which book you read). Almost > all assemblies have one letter after the sequence number (i.e. the first > shippable design is dubbed version A), some have two characters, a few have > three (i.e. TLN9999A1A). >
