VHF Engineering Information Index

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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 148kb, 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 312kb, 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 309kb, 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 4.9 MB 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 478kb manual number 5010901
This is the documentation on the VHFE Repeater

RX-50C, RX-144C, RX220C, RX432C 940kb manual number 5010305
This is the documentation on the VHFE RX-series receivers

TX-144B, TX-220B 507kb manual number 5010602
This is the documentation on the VHFE TX-series 2m and 220 MHz transmitters

TX432 UHF transmitter kit manual 400kb
Started as individual scanned PDF pages, converted to BMPs, turned back into one PDF file.

432 MHz transmitter schematic 340kb
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 (includes service info) 5.4MB PDF courtesy of Glenn Petersen KE9QZ

Power Supply PS-3A documentation:
Info Sheet 36kb
Schematic 72kb manual number 5010203

PS-15C Power Supply Instruction Manual 1.9 Mb manual number 5010103

PS-25C Power Supply Kit Instruction Manual 700kb

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

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.

Assembly and Instruction Manuals:
	COR-2 module 148kb, 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 312kb, 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 309kb, 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 4.9 MB 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 478kb manual number 5010901 This is the documentation on the VHFE Repeater
	RX-50C, RX-144C, RX220C, RX432C 940kb manual number 5010305 This is the documentation on the VHFE RX-series receivers
	TX-144B, TX-220B 507kb manual number 5010602 This is the documentation on the VHFE TX-series 2m and 220 MHz transmitters
	TX432 UHF transmitter kit manual 400kb Started as individual scanned PDF pages, converted to BMPs, turned back into one PDF file.
	432 MHz transmitter schematic 340kb 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 (includes service info) 5.4MB PDF courtesy of Glenn Petersen KE9QZ
	Power Supply PS-3A documentation: Info Sheet 36kb Schematic 72kb manual number 5010203
	PS-15C Power Supply Instruction Manual 1.9 Mb manual number 5010103
	PS-25C Power Supply Kit Instruction Manual 700kb
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.