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Compiled by Mike Morris WA6ILQ
Maintained by Robert Meister WA1MIK

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The contents of this page, like almost every page here at, are totally dependent on donations of information.

Anybody want to do an overview and programming article on the 5100 handheld and 5300 mobile radios?

Anybody want to do an overview and programming article on the Low Band, High Band and UHF Johnson Challenger Line?
Or separate articles?
Supposedly the Challenger was designed as competition to the Motorola MaxTrac, and does everything it does but better.

Here's the schematic of the EFJ "Remote Programming Interface", part number 023-9800-000 (it was EFJ's version of the Motorola RIB). Originally it was developed to program the 9800 and 8200 series radios, but was eventually used to program most of the programmable radios. It's a 4-page PDF, with page 3 is the schematic and board view, page 4 is the parts list. There is a homebrew version on the Joel Huntley page listed below, along with the pinout of the Challenger 7184 and 7186 programming connector. We still need schematics for the cables that go between the RPI and the radios.

Joel Huntley - WA1ZYX has a page on the two models of the UHF Challenger that offers an intro on two models: the 7184 and 7186 complete with photos, a link to downloadable RSS, the programming procedure, interfacing to a repeater controller, and more. These radios program right up on the amateur UHF band.   (offsite link)
Note: Another option to soldering the programming cable to the pads in the radio is to just hacksaw a piece off of the connector from the drive end of an old 5.25 inch floppy cable and use it.
The Challenger 7171 Service Manual Part 1   3.1 MB PDF file
The Challenger 7171 Service Manual Part 2   2.3 MB PDF file
Tune-Up Instructions for the 7180-7187 series.   1.3 MB PDF file
As far as we know, there are three programs that are used to program the Challenger series:
1) QB7171 Programs the 7171A, 7171B, 7151A and 7151B models.
2) QB7172 programs the 7172A and 7152A models.
3) RP7175 programs the 7171C, 7151C, 7172B, 7152B, 7175, 7155, 7160, 7161, 7162, 7163, 7164, 7165, 7166, 7167, 7180, 7181, 7182, 7183, 7184, 7185, 7186 and 7187 models.
We'd be happy to host the programs (and any others) for download here if it can be done so legally.
In a posting on the EFJ yahoogroup a gentleman reported that the model numbers in the 71xx series of Challengers were organized such that:
> The VHF units were 715x and 716x (the 5x were 1st generation and 6x were 2nd generation)
> The UHF units were 717x and 718x (the 7x were 1st generation and 8x were 2nd generation)
> The following numbers replace the x as mentioned above:
>  1 = 2 Channel 25 watts (VHF) 15 watts (UHF)
>  2 = 8 Channel 25 watts (VHF) 15 watts (UHF)
>  3 = 2 Channel 40 watts (VHF) 35 watts (UHF)
>  4 = 8 Channel 40 watts (VHF) 35 watts (UHF)
>  5 = 20 Channel 40 watts (VHF) 35 watts (UHF)
>  6 = 99 Channel 40 watts (VHF) 35 watts (UHF)
>  7 = 99 Channel 100 watts (VHF) 80 watts (UHF)
>  If it had a -5 after the number it was a remote mount system
>  Tom Crowley KC0VII

The PPL-6xxx was one of the last series of crystal-controlled radios, the PPL-6050 was the VHF version and the PPL-6060 was the UHF version.

PPL 6060 UHF repeater conversion   A conversion of the EFJ PPL 6060 to a GMRS repeater by Jim Sharp
PPL 6060 UHF Transmitter Tuning   Tuning instructions for the transmit section by Matt Krick  K3MK
PPL 6060 UHF Receiver Tuning   Tuning instructions for the receive section by Matt Krick  K3MK
PPL 6060 Service Manual   3.3 MB PDF file donated by Eric Lemmon WB6FLY
Anybody have the 6050 service manual? (the VHF version)

"Call Guard" is Johnson's name for CTCSS tone squelch.

Call-Guard tone table   This is a table explaining their tone numbering scheme.

The CR1000 (earlier) and CR1010 (later) are Johnson's continuous duty high power conventional stations (repeater or base station). Once set up they are darn near bulletproof stations. The best way to use the CR-series station is to set it up as a full duplex base and use an external repeater controller such as an NHRC, Scom, ICS, RLC / Link, etc. Neither the 1000 or 1010 are synthesized and if you pick up one second hand MAKE SURE IT COMES WITH THE CRYSTAL ELEMENTS / TCXOs. They are very rare to the point of being pure unobtanium. In short, if you don't get a set of TCXOs with the station you will have to adapt something external to substitute for it. A "reference" (whatever that means) schematic of a TCXO is in the manual on the receiver schematic page, there is nothing on the TCXO listed on the exciter schematic. If you can't cobble up something then your station is just so much scrap metal. If anyone is successful in mating a CR-series station to a Motorola Channel Element, a GE ICOM or to a generic International Crystal TCXO please write an article on it and send it to us. Don't forget that the transmitter modulator is in the TCXO (the transmit and receive TCXO are identical - but the modulator in the receive TCXO is unused). My first effort would be to start with a set of Motorola Mitrek elements, as the Mitrek transmit element contains a modulator.

If anyone has additional information, including manual scans, on the 1000, 1010, 1100 or 1200 statons we'd love to have it.

Repeater CW Identifier card   846 kB PDF donated by James Duram
Repeater DC Remote Adapter card   770 kB PDF donated by James Duram
Repeater Type A Call Guard card   1.2 MB PDF donated by James Duram
Connecting a Com-Spec TS-32 to an EFJ Repeater   145 kB PDF donated by James Duram
CR-1010 Repeater Alignment   by Clay Brown KI4ONH
CR-1010 Repeater Service Manual   8.2 MB PDF courtesy of Clay Brown KI4ONH
Note that the unit supports a standby battery, and the power supply has a charger in it - which consists of one 5.6 ohm resistor from the 15v DC line to the battery (see figure 8-8). This can cook your battery and kill it all too soon. I suggest you remove R10 from the power supply and use an external modern multistage charger.
CR-1010 Indentifier PROM programming   120 kB PDF courtesy of Clay Brown KI4ONH
The identifier in the control drawer is a pain to use as the MCW speed and tone frequency are fixed, plus you have to hand code the callsign in binary, then burn it into a 256x4 PROM chip (an 82S123 that is difficult to find) using a made-for-the-job EFJ external programmer box. And the box was limited and you had to use two separate program cycles, one for each 128x4 half. If you are using an external repeater controller just disable the internal identifier and use the one in the controller.
Anybody want to do an interfacing article ?   (i.e. connecting an external repeater controller to an EFJ station)

Miscellaneous radios....
EFJ 1100-series VHF Repeater Service Manual   8.64 MB PDF   August 1996 version.
EFJ 5100-series Digital/Analog Portable Radio Operating Manual   727 kB PDF   May 2002 version.
EFJ 5100-series Digital/Analog Portable Radio Service Manual   13.5 MB PDF   December 2004 version.
EFJ 5300-series Digital/Analog Mobile Radio Operating Manual   1.6 MB PDF   December 2004 version.
EFJ 5300-series Digital/Analog Mobile Radio Service Manual   21.6 MB PDF   January 2005 version.
Accessing the Radio Test modes in the 5100 and 5300 series radios   Compiled by Robert Meister WA1MIK
How to get into the radio test mode, the various frequencies and modes, and what all the buttons do.
51XX and 53XX model number breakdown   Provided by Jon KD5SFA
EFJ Conventional Voting Receiver Service Manual   5.3 MB PDF
This writeup describes the conventional voting receivers and the voter (which appears to be a JPS brand unit). VHF, UHF, 800 and 900 MHz units are described, including both single and multichannel voting systems.
Model numbers include CVR, RDM, 2xxx, 2000, 2004, 2008, 2009, 2031, 2061, 2081, 2034, 2044, 2054, 3039.
EFJ 600 UHF Repeater manual   4.3 MB PDF
A 20 watt crystal-controlled UHF desktop base or repeater station, model 242-0600-XXX. Covers 450-470 MHz. A unique product that converts between a repeater or base station at the touch of a button. Donated and scanned by Will Armstrong KC4YBZ, cleaned up and submitted by Eric Lemmon WB6FLY.
EFJ 751x and 754x "Falcon" handheld radios   1.1 MB PDF
The 751x (high band) and 754x (UHF) handhelds are 32 channels, synthesized, PC programmed and conventional-only. The VHF models cover 136-174 MHz in two ranges, and the UHF models cover the UHF band in four ranges (comonly called "splits"). Any specific radio is made for only one split and it is not practical to change the split. The split is encoded in the model number. For example, the model plate might say "242-7640-032". The second last digit, the "3" in the "-032", is the split: 1=136-150 or 400-430, 3=146-174 or 450-470, 4=470-490, and 5=488-512. This is all documented in the manual.
EFJ 761x and 764x "Falcon" mobile radios   3.9 MB PDF
These models are essentially the Falcon handheld in a mobile box with a 45 watt (VHF) or 35w (UHF) power amplifier behind it. These connect to a PC directly; they do not need the RPI box.
Here's the revision to the manual.   425 kB PDF
Since the mobile is based on the Falcon handhelds above, the splits are the same, and documented in the manual.
EFJ 98xx service manual (ver 2)   13.5 MB PDF file donated by Art Bross KC7GF.
This manual covers the 984x UHF radios, the 988x 800 MHz radios and the 989x 900 MHz radios. We don't have any articles on these radios yet... just the manual.
Here are the operating manuals: "Low Tier" (the minimal display units) and the "High Tier" (full display) units.
Here's the early version service manual if you need it   9.6 MB PDF file.
EFJ DTMF Microphones manual   1.1 MB PDF
Contains hookup and schematics for 250-0751-0XX DTMF microphones.

Additional information pertaining to 900 MHz frequencies, radios, and conversions can be found here.

Programming cable information can be found here.

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Page created 27-December-2005 by Mike Morris WA6ILQ   (callsign) //at// repeater-builder //dot// com

This web page, this web site, the information presented in and on its pages and in these modifications and conversions is © Copyrighted 1995 and (date of last update) by multiple originating authors and Kevin Custer W3KKC. All Rights are Reserved, including that of paper and web publication elsewhere.