|Miscellaneous Electronic Reports, Data, Historical Items, Projects|
|Repair of ICOM IC-28A, -28H squelch pot plus battery replacement
A three-page report on replacing the squelch pot in this older Icom 2-meter FM radio. If yours is bad this is how to fix it. This is a good, rugged radio well worth fixing if possible. Icom will not repair this radio since it is an older model.
four-page report details the repairs I made on a burned out probe. I
replaced two diodes and one P-Channel FET in the probe. Note added April 2016 (see last page of document)
HP8405A Technical Data - six page summary of instrument, Jan. 1977, pdf file
Measurement of Complex Impedance - HP App Note 77-3, April 1967. Discribes use of the HP4815A and HP8405A instruments to measure complex impedance.
James Millen Co. 1972 catalog - pdf file, 12 Meg
Sierra Electonic Co. catalog, possibly early 70's - pdf file, 18 Meg
Bird Model 43 Manual, not dated, but possibly from the 1960's. - pdf file, 13 Meg
Eimac Y-870, A High-mu Power Triode, pdf file
Collins Mechanical Filters Catalog, from 1970, pdf file, 15 Meg
Cornell-Dubilier, HAM-M Antenna Rotator, copy of manual, pdf file, 12 Meg
This is an older rotator now built by Hy-Gain. Similar to Model IV.
Vectron Model 218-9474, Crystal Oscillator, data sheet and specifications, pdf file
"Extra Terrestrial Relays" by Arthur C. Clarke, from Wireless World, October, 1945.
An amazing article which describes how geostationary statellites could be used to relay radio