The Motorola Reference Manual describes the B61LPY-3100DT as a Repeater (RT) Station for the 25-50 MHz band. It is rated as 100 watts continuous duty, with Private-Line squelch and DC remote control. The service manual for the station is 6881003E65 (68P1003E65 my note: what I think the number is) which, unfortunately, is long out of print and not available from Motorola Parts. You may be able to locate that manual on an auction site. Armed with the service manual, you should be able to convert that station's receiver to the 6m band by changing out some capacitors in the front end and local oscillator stages. The transmitter section will take a lot more work, but it can be done with the appropriate tools and test equipment. You might consider contacting a firm that specializes in such conversions for suggestions and cost. Repeater-Builder (the Company) is one such firm. The Sinclair R-103G duplexer is a very good unit, but it will take some serious sheet-metal work to make it perform well in the 6m band. The conversion involves shortening both the outer cylinder and the internal elements, and changing the cable harness. You might consider contacting Sinclair tech support for suggestions, at www.sinctech.com Although they are somewhere around 30 years old, such Motorola stations seem to keep running... 73, Eric Lemmon WB6FLY ------------------------------------------- The repeater is a 120 watt continous duty Motrac with factory PL and no extender, I think. The duplexer is a exactly what the label says. I have had one operating on 6 meters for about 15 years. They need slight modification to go to 6 meters. MY note: Someone mentioned ------------------------------------------- JOHN MACKEY wrote: > > hmmm... I would have to check my books, but didn't the low band > motran use a different channel element than the low band motrac > on transmit? (Or did they BOTH use the TLN-1082?) I ... hmmm ... I'll have to look. I did some research on that specific issue some months back - but it is now on the computer in the garage. Well, I did look ... and printed it out ....... ( Now the fun begins ... ) Any Motrac model numbers ending in 'HHT' use crystal ovens to maintain the FCC type acceptance - and are not covered below. Since the current discussion is about Channel Elements, the following is by Channel Elements and for the low band Motrac/Motran series radios: Channel Radio Model Rec / Number of Tol. Element Series Series Trans Channels* TLN1020A U41LLTA Motran Receive 1 Freq 0.0005% TLN1020A U61LLTA Motran Receive 1 Freq 0.0005% TLN1020A B61LPB Motrac Base Sta Receive 1 Freq 0.0005% TLN1020A J61LPB Motrac Base Sta Receive 1 Freq 0.0005% TLN1020A B71LPB Motrac Base Sta Receive 1 Freq 0.0005% TLN1020A J71LPB Motrac Base Sta Receive 1 Freq 0.0005% TLN1021A U41LLTA Motran Receive 2 Freq 0.0005% TLN1021A U51LLTA Motran Receive 2 Freq 0.0005% TLN1022A U41LLTA Motran Transmit 1 Freq 0.0005% TLN1022A U51LLTA Motran Transmit 1 Freq 0.0005% TLN1022A B61LPB Motrac Base Sta Transmit 1 Freq 0.0005% TLN1022A J61LPB Motrac Base Sta Transmit 1 Freq 0.0005% TLN1022A B71LPB Motrac Base Sta Transmit 1 Freq 0.0005% TLN1022A J71LPB Motrac Base Sta Transmit 1 Freq 0.0005% TLN1023A U41LLTA Motran Transmit 2 Freq 0.0005% TLN1023A U51LLTA Motran Transmit 2 Freq 0.0005% TLN1023A B61LPB Motrac Base Sta Transmit 2 Freq 0.0005% TLN1023A J61LPB Motrac Base Sta Transmit 2 Freq 0.0005% TLN1023A B71LPB Motrac Base Sta Transmit 2 Freq 0.0005% TLN1023A J71LPB Motrac Base Sta Transmit 2 Freq 0.0005% TLN1049A B61LPB Motrac Base Sta Receive 2nd Receivr 0.0005% TLN1049A J61LPB Motrac Base Sta Receive 2nd Receivr 0.0005% TLN1049A B71LPB Motrac Base Sta Receive 2nd Receivr 0.0005% TLN1049A J71LPB Motrac Base Sta Receive 2nd Receivr 0.0005% TLN1081A,B C71LHB Motrac Compa Ba Receive 0.0005% TLN1081A U41LHT Motrac Receive 0.0005% TLN1081A U51LHT Motrac Receive 0.0005% TLN1081A U71LHT Motrac Receive 0.0005% TLN1081A N01LNB Satellite Rec'r Receive 0.0005% TLN1081A U41LLTB Motran Receive 0.0005% TLN1081A U51LLTB Motran Receive 0.0005% TLN1081A B61LPB Motrac Base Sta Receive 0.0005% TLN1081A B71LPB Motrac Base Sta Receive 0.0005% TLN1081A B91LPB Motrac Base Sta Receive 0.0005% TLN1082A,B U41BBA Mocom-70 Transmit 0.0005% TLN1082A,B U61BBA Mocom-70 Transmit 0.0005% TLN1082A,B U71BBA Mocom-70 Transmit 0.0005% TLN1082A U51BBN Mocom-70 Transmit 0.0005% TLN1082A,B C71LHB Motrac Compa Ba Transmit 0.0005% TLN1082A U41LHT Motrac Transmit 0.0005% TLN1082A U51LHT Motrac Transmit 0.0005% TLN1082A U71LHT Motrac Transmit 0.0005% TLN1082A U41LLTB Motran Transmit 0.0005% TLN1082A U51LLTB Motran Transmit 0.0005% TLN1082A B61LPB Motrac Base Sta Transmit 0.0005% TLN1082A B71LPB Motrac Base Sta Transmit 0.0005% TLN1082A B91LPB Motrac Base Sta Transmit 0.0005% TLN1085A B61LPB Motrac Base Sta Receive 0.0005% TLN1085A B71LPB Motrac Base Sta Receive 0.0005% TLN1085A B91LPB Motrac Base Sta Receive 0.0005% Note: TLN1085A Channel Element is used in the second receiver of two receiver stations - late model stations - IF = 2.54 MHz TLN1086A C71LHB Motrac Compa Ba Receive 0.0002% TLN1086A U41LHT Motrac Receive 0.0002% TLN1086A U51LHT Motrac Receive 0.0002% TLN1086A U71LHT Motrac Receive 0.0002% TLN1086A B61LPB Motrac Base Sta Receive 0.0002% TLN1086A B71LPB Motrac Base Sta Receive 0.0002% TLN1086A B91LPB Motrac Base Sta Receive 0.0002% TLN1087A C71LHB Motrac Compa Ba Transmit 0.0002% TLN1087A U41LHT Motrac Transmit 0.0002% TLN1087A U51LHT Motrac Transmit 0.0002% TLN1087A U71LHT Motrac Transmit 0.0002% TLN1087A U41LLT Motran Transmit 0.0002% TLN1087A U51LLT Motran Transmit 0.0002% TLN1087A B61LPB Motrac Base Sta Transmit 0.0002% TLN1087A B71LPB Motrac Base Sta Transmit 0.0002% TLN1087A B91LPB Motrac Base Sta Transmit 0.0002% TLN1096A U41LLTB Motran Receive 0.0002% TLN1096A U51LLTB Motran Receive 0.0002% TLN1113A U41LLTA Motran Receive 1 Freq 0.0002% TLN1113A U51LLTA Motran Receive 1 Freq 0.0002% TLN1114A U41LLTA Motran Receive 2 Freq 0.0002% TLN1114A U51LLTA Motran Receive 2 Freq 0.0002% TLN1115A U41LLTA Motran Transmit 1 Freq 0.0002% TLN1115A U51LLTA Motran Transmit 1 Freq 0.0002% TLN1116A U41LLTA Motran Transmit 2 Freq 0.0002% TLN1116A U51LLTA Motran Transmit 2 Freq 0.0002% *Number of channels refers to the number of specific different crystal & oscillator circuits in the Channel Element - applies to the early Channel Elements only. The later radios Channel Elements were all only one channel each. If there is no specified number of channels listed per line, it is to be assumed to be a 1 frequency Channel Element only. Everything above is taken directly from a factory manual ... my typos not with standing ... :( Also, the file I have is about 1200 lines so far for listing by Channel Element number. It does not include the listings by Base / Repeater / Mobile / other station model numbers - which is another file. I made the study last winter ... this winter I hope to complete the project - I probably have another 5-600 manuals to get out, study and enter the information. Will cover all radios that I can identify and have manuals for - from 25 MHz thru 960 MHz ... and possibly above. (I have 20 four drawer file cabinets with General Electric, Motorola, RCA and other manufacturers manuals.) > I can tell you with great certainty that the UHF motran used a > different channel element than the UHF motrac in BOTH transmit & > receive. The UHF Motrac Receiver in the LHT models use either the TLN1081A,B (0.0005%) or the TLN1086A (0.0002%) The UHF Motrac Transmitter in both LHT and MHT both take the same Channel Elements be it the TLN1083A,B (0.0005%), TLN1087A (0.0002%) or the two piece version (0.0005%). The UHF Motran uses the 'S' exciter TLN1146A (0.0005%) or the TLN1190A (0.0002%) or the two piece version (0.0005%) The UHF Motrac MHT Series and UHF Motran MST Series receivers are identical and use the same Channel Element Series ... both types ... the AFC and non-AFC types. Further discussion may be here in the future - similar to the above info for the low band radios ... but is far more extensive. > But other than the transmitters & the UHF motran, all the motrac/motran > receivers used the same elements. True, for the most part - unless you have one of the very early Motrans where there is a one or two oscillator Channel Element - remember those? (Both low and high band.) I hope the above information helps. Neil McKie - WA6KLA ------------------------------------------------- JOHN MACKEY 23 Mar 2004 00:40:15 -0000 The Motrac & Motran have the same receivers, there are no differences. Of course, there are differences in versions. The Motrac had the H, L, & M model of receivers. The Motran had only the L & M receivers (there were no Motrans in the "H" era of Motracs). Micheal Salem <[EMAIL PROTECTED]> wrote: SNIP > a later version of motrac. By my understanding and > experience, there was little difference between > a Motrac receiver and a Motran receiver (FET in > the rf preamp instead a bipolar, etc.) There > were, of course, differences in the transmitters. > > If I understood Matthew's e-mail, he said that > it had no tubes but used Motrac cables. While > I have experience with Motrac mobiles and > base stations, I only have experience with > Motran type base stations, (i.e., MSY type stations > which had solid state 10 - 12 watt exciters). I > thought that the Motrans used Motrac cables. > > Since he said it had no tubes, it sounds like he > has a Motran. > > Micheal Salem N5MS > > > > mch wrote: > > That would be the MOTRAN. They have a boat > > load of round transistors in the final area. > > > > They used the same accessories as the MOTRAC. > > > > Or are you saying there really were MOTRACs with no tubes? > > > > Joe M. > > > > Micheal Salem wrote: > > > >>Matthew: > >> > >>There are later versions of the Motrac which would be all > >>solid state. A model number for a motrac would start > >>with U23, U43, U53, etc. The tube versions would end > >>with HHT, for example. I think that the solid state > >>version would be a MHT or perhaps an LHT so that the > >>solid model would be something like U43MHT. ------------------------------------------------ JOHN MACKEY Tue, 24 Jul 2007 22:48:18 -0700 I have tuned on 2 of the U51LLT radios and many of the L receivers that were in the later low-band motracs, all going to 52-53 MHz. I never had a problem getting a L receiver to tune to 52.525 MHz or the 53 MHz repeater output band EXCEPT for the multiplier stage needs to have about 3 capacitors swapped out for higher range. The front end coils always tuned up fine for me. On the 2 LLT transmitters I tuned, one exicter tuned up fine and the other exciter tuned up with the output slug nearly out of the coil form. The transmitter with the exciter output slug coming out of the coil form peaked at about 47 watts. I always wanted to try replacing the capacitor with a lower value to see if the full 50 watts would appear, but never did actually try it. ---------------------------------------------- My Notes from Bron Kidwell brkidwell@verizon.net N3AGB Maintains the 6 meter repeater in the DC area. Currently in Melbourne, Florida for the winter? Notes per phone call on 02/18/2007 Conversion thoughts: 2-3 caps in the exciter need changing RX front end needs a turn off the first coil Send him model numbers off the RX and TX units so he can do further research and get back to me. ----------------------------------------------- 4.1. Re: Motorola TLD6612A amp repair Posted by: "allan crites" wa9zzu@arrl.net wa9zzu Wed Feb 27, 2008 9:56 am (PST) Larry, I was not going to make a response to your last but since you have provided your source of information may I then provide mine. It appears that your Motorola sales guy's misled you and that you have unsubstantiated information which you never bothered to verify by reading the manuals or sales literature. As a supervising engineer at Motorola Comm. Div. in the 1960's and 70's I never heard of or ever knew of an Upright Base Station being referred to as a Motrac base station or repeater. In addition, no Upright base never had a xmtr anywhere like the xmtr in a Motrac mobile like you suggest. Also the Upright base never had an "H" series rcvr. The original LB & HB Upright Base had an "L" rcvr, with an altogether different audio output board and output transistor stage, unlike the audio in a rcvr in a Motrac mobile, and an all transistor one piece control chassis. See HB manual no. 68P81032A70- A. The second version of Upright Base Stations came with an "L" rcvr in LB & an "M" rcvr in HB both with a modularized control chassis. See LB manual no. 68P81003E25- O and HB manual no. 68P81003E55- A. Motorola also manufactured Upright Base Stations and Multiple - Receiver base stations for use in IMTS telephone operations using 450 MHz "M" rcvrs. Are these to be called "Motrac" IMTS stations also? See manual no. 68P81059 A95-B. The only "base" stations manufactured by Motorola with xmtrs and rcvrs identical to a Motrac mobile were the Compa Station and the Consolette Station in LB, HB, & 450 models. For the Compa stations see LB manual no. 68P81005E40- O and HB manual no. 68P81005E80- B. Another Compa Station manufactured but which was not very successful, used the Motran all transistor mobile xmtr and "L" rcvr. Would you call that a Motrac base because the same rcvr was used in the Motrac mobile with the same channel elements? Just because you found channel elements used in Motrac mobiles identical to those used in the Upright Base does not make the Upright base into a "Motrac Base Station". And for the record I have one HB Upright Base Station rptr on 154.xxx MHz, another HB Upright base station, one 450 Upright Base Station, one LB 6M Compa station rptr and two HB Compa stations, as well as several different LB, HB, and 450 Motrac mobiles, in my inventory. I have also a 224.5 MHz repeater which uses a converted 450 xmtr & a converted HB "M" rcvr. Does that make my 224.5 rptr a Motrac rptr? AC "larryjspammenot@ teleport. com" wrote: OUr local Motorola sales guys always promoted them as "MOTRAC" series base stations/repeaters, since they used H, L or M series MOTRAC receivers, pretty much the same exciters, the same channel elements, etc. We always knew them in the 2-way shops as "MOTRAC" base stations, which differentiated them from the later model "MICOR" series (1971 vintage, etc.) LJ -----Original Message----- From: Eric Lemmon Sent: Feb 26, 2008 7:11 PM To: Repeater-Builder@ yahoogroups. com Subject: RE: [Repeater-Builder] Re: Motorola TLD6612A amp repair Larry, The Motorola Reference Manual identifies the B93MPB as simply "Upright Base Station." It has no nickname. 73, Eric Lemmon WB6FLY -----Original Message----- From: Repeater-Builder@ yahoogroups. com [mailto:Repeater-Builder@ yahoogroups. com] On Behalf Of larryjspammenot@ teleport. com Sent: Tuesday, February 26, 2008 8:29 AM To: Repeater-Builder@ yahoogroups. com Subject: RE: [Repeater-Builder] Re: Motorola TLD6612A amp repair I have one of the 10-Meter B91LPB stations, uses Motrac receiver, elements, etc. with a PA deck using 2 - 8560A tubes. What Motorola Base Station series would you call the B93MPB station? It's certainly not a MICOR. ------------------------------------------------ .5. Re: Motorola TLD6612A amp repair Posted by: "JOHN MACKEY" jmackey@usa.net jmackey_usa_net Wed Feb 27, 2008 5:52 pm (PST) OK, let's look at the ID that Motorola gave these radios!! B93MPB and B91LPB The first "B" means it is a base station. The "9" indicates it is high power, over 150 watts. The "3" means it is VHF high band (138-174 MHz) and the "1" means it is VHF low band (25-50 MHz) The "M" means it is the M receiver and the "L" means it is the L receiver, BOTH of which are from the Motrac line. The "P" means it is the P transmitter. This equipment is NOT from the Micor line. However, the 250 watt PA decks and power supply were essentially the same in the Micor line. But again, the receiver and transmitter were NOT Micor, they were Motrac (on the two examples given here) ------ Original Message ------ Received: Tue, 26 Feb 2008 09:11:15 PM CST From: "Eric Lemmon" To: Subject: RE: [Repeater-Builder] Re: Motorola TLD6612A amp repair > Larry, > > The Motorola Reference Manual identifies the B93MPB as simply "Upright Base > Station." It has no nickname. > > 73, Eric Lemmon WB6FLY ----------------------------------------------