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VHF Engineering
   


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 PDF, manual number 5011001
This module implements the carrier delay timer (sometimes called the hang-in timer) and the timeout timer.
COR-2 module notes   312 kB PDF, manual number 5011001 Rev.00
The above manual with some hand-drawn notes on the schematic
VHF Engineering CW ID
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 manual   366 kB PDF,   manual number 5011002
The cover page photo on the PDF is way too 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 PDF, 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 PDF,   manual number 5010901
This is the documentation on the VHFE Repeater
RX-50C, RX-144C, RX220C, RX432C   940 kB PDF,   manual number 5010305
This is the documentation on the VHFE RX-series receivers
TX-144B, TX-220B   507 kB PDF,   manual number 5010602
This is the documentation on the VHFE TX-series 2m and 220 MHz transmitters
TX432 UHF transmitter kit manual   400 kB PDF, manual number 5010604
Started as individual scanned PDF pages, converted to BMPs, turned back into one PDF file.
432 MHz transmitter schematic   340 kB PDF
Hand-drawn schematic (by an unknown person), sent to Repeater-Builder by Martin HB9TZW
BLD-220 power amplifier   534 kB PDF, manual number 5011225
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 PDF,   manual number 5010103
PS-25C Power Supply Kit Instruction Manual   700 kB PDF
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.