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Technical Information on Equipment by
Compiled by Mike Morris WA6ILQ
Maintained by Robert Meister WA1MIK
This page lists available documentation for equipment made by
the "VHF Engineering" company of Binghamton, New York, USA,
commonly known as "VHFE".
There is a "VHF Engineering" located in Cannock, Staffordshire, UK that is totally unrelated to the USA company.
|Assembly and Instruction Manuals:|
|COR-2 module 148 kB,
manual number 7010250 and 7010251
This module implements the carrier delay timer (sometimes called the hang-in timer) and the timeout timer.
|COR-2 module notes 312 kB, The above manual with some hand-drawn notes on the schematic|
|VHF Engineering CW ID board
CW-ID JPG photo CW-ID Parts List CW-ID Programming CW-ID Schematic CW-ID Testing CW-ID Theory
All of the above as a single 10 page PDF: CW-ID package 366 kB
The cover page photo on the PDF is way to dark, the CW-ID JPG photo above is much better.
Note that the VHFE IDer produces a square wave output that needs to be filtered before injecting into a transmitter. DO NOT use this IDer on a transmitter that has no audio filtering before the modulator.
With a few mods this unit can serve as an RTTY "whoami" string encoder.
|PA-144/15, PA-144/25, PA220/15, PA450/10
309 kB, manual number 50100807
This board could be built as a 15 or 25 watt 2m amplifier, a 15 watt 220 MHz amplifier, or a 10 watt 432-450 MHz amplifier.
|BLC 2-70 and 10-70 VHF Amplifiers 781 kB
PDF, manual number #5011215 Rev 00
The 10-70 is a 10w in, 70w out 2m amplifier, the 2-70 has an extra stage and is the 2w in, 70w out version. It can be built as a class C (i.e. FM) amplifier or as a class AB (i.e. SSB) amplifier.
If you exceed the rated input power you WILL blow up the input stage.
|RPT-50, RPT-144, RPT-220, RPT-432
478 kB manual number 5010901
This is the documentation on the VHFE Repeater
|RX-50C, RX-144C, RX220C, RX432C
940 kB manual number 5010305
This is the documentation on the VHFE RX-series receivers
507 kB manual number 5010602
This is the documentation on the VHFE TX-series 2m and 220 MHz transmitters
|TX432 UHF transmitter kit manual 400 kB
Started as individual scanned PDF pages, converted to BMPs, turned back into one PDF file.
|432 MHz transmitter schematic 340 kB
Hand-drawn schematic (by an unknown person), sent to Repeater-Builder by Martin HB9TZW
|BLD-220 power amplifier 534 kB
220 MHz amplifier
|HT-144B Instruction Manual 4.0 MB PDF courtesy of Glenn Petersen KE9QZ (includes service info)|
|Power Supply PS-3A documentation:
Info Sheet 36 kB
Schematic 72 kB manual number 5010203
|PS-15C Power Supply Instruction Manual 1.9 MB manual number 5010103|
|PS-25C Power Supply Kit Instruction Manual 700 kB|
|The VHF Engineering power supplies were based on the NE550 voltage regulator IC instead of the more common "723" chip. As such the schematic and theory sections are applicable to other supplies based on the same chip.|
We're looking for any VHFE manuals not listed above.
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This page originally posted on 20-Jan-2005
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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 Kevin Custer W3KKC and multiple originating authors. All Rights Reserved, including that of paper and web publication elsewhere.