Good point. Your L44BBB is a 18 watt tabletop base station with a 6907 tube for a final. Have fun tuning it up.
It will not convert well into a repeater as the power supply won't handle it. Neil JOHN MACKEY wrote: > > Actually, it is a L44BBB. > > You missed one below, the "L" means base consolette. > > ------ Original Message ------ > Received: Tue, 04 Jan 2005 12:20:33 PM CST > From: Neil McKie <[EMAIL PROTECTED]> > To: [email protected] > Subject: Re: [Repeater-Builder] Need KXN1052A UHF Micor Channel Element > > > > > > > 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: [email protected] > > > 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: [email protected] > > > > > 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 > > > > > > > > > > > > > > > > > > > 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/
