Quote:
Originally Posted by Boobtubeman
Thanks John for the help and thanks to the others who helped me in this thread 
I have enough caps to re-do the donor radio however im missing a major component, The schematic says i need a 1meg volume controll 1/4" half moon shaft it appears, anyone have one lying around or can show me a link to one online?
The first delco is operating fine  It gets AM 535-1720 kc.. and the foreign short wave 5.2-18.1 M.C. works well also.. However, the police and ameteur band 1695-5500 K.C. seems a bit quiet, im getting noise and some buzzing in certain places on the dial... Just wondering what kind of traffic i should be recieving in this bandwith?
Steve |
What type of antenna are you using with that radio? You should be hearing some activity in the 1695-5500 kHz range if you have a good antenna on that set. This range includes the amateur 160- and eighty-meter bands, with the 4000-5500 kHz range being short wave. If you have an AM broadcast station in your area on or above 1690 you should also be able to hear it, as 1610-1700 kHz is the new extension of the standard AM broadcast band (the band is no longer used for police radio, of course--the cops have all gone to UHF). You will get the best results by using an outdoor wire antenna; when that radio was new in the late '30s just about everyone had an outdoor wire for the broadcast band, since most AM stations were low-powered operations and the receivers weren't that hot, either. Case in point: One of the first shortwave receivers I listened to the world on, before I got my ham radio license, was my dad's Hallicrafters S-19R. This receiver was from 1936 and was little more than a broadcast receiver with a couple of shortwave bands thrown in as an afterthought. The radio needed an outdoor antenna to get
any kind of reception at all on the broadcast band (band 1) and the first two shortwave bands. I had such an antenna and had decent reception on those ranges, but band 4, which stretched from, IIRC, 25 to 40 MHz, was always dead as a doornail. I could understand why the 31-40 MHz range was dead most of the time, but why on 25-30 MHz as well (no noise, static, or anything else)? Probably, that was just because of the design of the S-19R's signal circuits, and as I said, this receiver was little or (more accurately) nothing more than a broadcast receiver with two shortwave bands thrown in as an afterthought. It was probably the worst shortwave receiver I ever used in my 30+ years of electronics experimenting and 36 years in ham radio; the receivers I've used since then, including the receiver in my present high-frequency ham radio transceiver, could certainly put that S-19R to shame.