Is it a 44BBY, 54BBY or 74BBY?
The 44BBY is one chassis group, the 54BBY & 74BBY is the same as the 44BBY but with the power amplifier attached - which uses a 4CX250B final. Do you have the manual for it? If you don't, it can be a long learning curve. With a manual, it can be fun. BTW, there is the earlier manual for it ... and the later manual which shows certain modifications that make the reliability better. Also, the associated RT manual tells how to make a repeater out of the base station. A 44BBB, 54BBB or 74BBB is the base station changing the last B to a Y makes it into a repeater. I deleted the usual first letter which specifies the cabinet it is in: J74BBY B = base station cabinet, usually 6 feet tall; C = Compa Cabinet, about 40-45 inches tall, J = Weatherproof cabinet, about 5' tall and quite rugged. The first digit being 4, 5 or 7 is the power output level: 4 = 20 watts out 5 = 60 watts out 7 = 100 watts out 9 = 250 watts out (see below) JOHN MACKEY wrote: > > I've got one of the old 44BBY base stations I've been meaning to > overhaul & put in to service at my work. (where they can pay the > electric bill to keep it running!) And heat the building too. John, this is one fun radio to try to get going. If you like tubed equipment, this is a good one for you to get started on. ;) For those of you out there wondering why in all of this, the BBY Series of UHF radios is the second in the list of 450-470 MHz equipment. The first, a 44AAY, used a 2C39 driving a 2C39 as the final giving about 20 watts out - if you were lucky. If you needed more power, then you upped the plate voltage on the second 2C39, prayed for the needed 30 watts. That fed the pair of 4CX250B's in push-pull. I was called to service one of these things about 30 years ago. A certain branch of the federal government had one of these 250 watt output systems in their office near Pasadena, California. The output of this thing fed a rather large grid dish on the roof of their building - was used as a point to point link - the other end being not too far away. Quietly I snickered when I found out what they wanted. They really wanted their end of the system completely overhauled and placed back in service. No matter of suggestion that they could get something one tenth in weight / ten times the reliability brand new. In the end, I had completely retubed the system, a B94AAB base station, and finally gave up at about 225 watts output. The radio shop I worked for at the time (Wil will remember this) didn't have the Bird #43 Wattmeter slug or RF load for this project so I brought mine from home. A note to Mike Morris, you probably have all of this in your Rosetta Stone file ... http://www.repeater-builder.com/motorola/motorola-suffixes.html Neil > ------ Original Message ------ > Received: Mon, 03 Jan 2005 11:22:54 PM CST > From: Neil McKie <[EMAIL PROTECTED]> > To: Repeater-Builder@yahoogroups.com > Subject: Re: [Repeater-Builder] Need KXN1052A UHF Micor Channel Element > > > > > > > True ... I used to service them years ago in southern California. > > > > I have one almost complete in my garage to add to your collection > > - I can deliver to your new place in a few days. (Jan 15th) > > > > I may have the community repeater panel also for your collection. > > > > Neil > > > > "[EMAIL PROTECTED]" wrote: > > > > > > Wow - now that's going back a "few" years! > > > LJ > > > > > > Original Message: > > > ----------------- > > > From: Neil McKie [EMAIL PROTECTED] > > > Date: Mon, 03 Jan 2005 20:42:17 -0800 > > > To: Repeater-Builder@yahoogroups.com > > > Subject: Re: [Repeater-Builder] Need KXN1052A UHF Micor Channel Element > > > > > > Hi Larry, > > > > > > I believe the TLN1124A Channel Element was used in the 0.0002% > > > field conversion on the J74BBY base and repeater station. I'll > > > have to look it up to be certain. > > > > > > Hope this helps, > > > > > > Neil - WA6KLA > > > > > > "[EMAIL PROTECTED]" wrote: > > > > > > > > I recently picked up a UHF MICOR 75-Watt Repeater which has the correct > > > > KXN1024A Receive Channel Element, but needs the KXN1052A Transmit > Channel > > > > Element. It came with a gold-colored TLN1124A Element in the > transmitter, > > > > which I don't believe was intended to go in a MICOR - I haven't been > able > > > > to find that numbered element in any of my MICOR manuals. I think > someone > > > > just stuck it in the transmitter because it was a UHF Transmit Channel > > > > Element and it physically fit in the exciter. > > > > > > > > Anyone have a spare KXN1052A? > > > > > > > > Thanks, > > > > Larry > > > > > > > > -------------------------------------------------------------------- > > > > mail2web - Check your email from the web at > > > > http://mail2web.com/ . > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > -------------------------------------------------------------------- > > > mail2web - Check your email from the web at > > > http://mail2web.com/ . > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > Yahoo! Groups Links > > > > 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/
