i volunteer mike wa6ilq
mdm
ka8gvh <[EMAIL PROTECTED]> wrote:
ka8gvh <[EMAIL PROTECTED]> wrote:
I found it, buried, deep in my Lynchburg Library.
Scanning all 54 pages will be a chore. I have the two pages of
appendix A "How to Build a Simple Sweep Modulator" ready to email to
those that want it.
The first three chapters would be a great addition to the Repeater-
Builders web site. I count about 30 graphics in those 3 chapters and
appendix. OCR the rest. I could make a trip to Kinko's and get copies
made, but would much rather give the book to someone who will post it
for all to use. Suggestions? Volunteers?
Duane Hall
AB8QU
-----------------------
GE Datafile Bulletin 1000-6
April 1967
I-F Alignment of Two-Way Radio FM Receivers
James J. Carrington - Specialist - Service Data
54 Pages
Table of contents
Introduction
Chapter 1 - I-F Filters used in FM Receivers
I-F Transformers
Ceramic Filters
Crystal Filters
Mechanical Filters
Chapter 2 - How to tell when IF alignment is needed.
Reasons why I-F realignment may eventually become necessary.
Symptoms of misalignment
False Indications of Misalignment
Tests to see if realignment is needed
Chapter 3 - Alignment Procedures
General Alignment Information
Peaking Method
Peak and Dip Method
Resistor Loading Method
Sweep Method (Oscilloscope Alignment)
Chapter 4 - Tips for Aligning Particular GE Recievers
Pre-Prog
Prog
Prog Portables
TPL and Business Mate
Pacer
Accent 450
Message Mate Rxrs
Voice Commander and Voice Director Rxrs
Porta-Mobil and Motorcycle
Mastr Pro and IMTS
Mastr Executive
Appendix A - How to Build a Simple Sweep Modulator
Appendix B - How to Build a Low-Frequency Sawtooth Generator
Summary -
This bulletin describes the types of I-F filters used in two-way
radio FM receivers and tests which can be used to determine when I-F
alignment is needed. The four methods of alignment commonly used are
discussed and tips for aligning particular GE recievers are
presented. Particular emphasis has been placed on the sweep alignment
method. The appendix provides instructions for building a simple
sweep modulator and a low frequency sawtooth generator.
From chapter 3
"...I-F circuits do not normally require realignment. Realign IF's
only when you are sure it is needed. In other words, Think before you
twiddle!..."
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Ted Bleiman K9MDM
MDM Radio Ltd -
1629-B N. 31 st Ave
Melrose Park, IL 60160
708.681.0300 fax 708.681.9800
web http://www.mdmradio.com -
1629-B N. 31 st Ave
Melrose Park, IL 60160
708.681.0300 fax 708.681.9800
web http://www.mdmradio.com -
Check it now!!
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