|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, 12,151 KB
"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