tag:blogger.com,1999:blog-7590176649168185428.post5286278806513477557..comments2024-03-28T18:51:21.655-04:00Comments on SolderSmoke Daily News: Radio History Question: Why 455 kHz as the IF frequency? Bill Mearahttp://www.blogger.com/profile/07662500663603350847noreply@blogger.comBlogger7125tag:blogger.com,1999:blog-7590176649168185428.post-11292825071163650332021-01-03T23:31:08.744-05:002021-01-03T23:31:08.744-05:00This seems correct ?
- https://www.physicsforums.c...This seems correct ?<br />- https://www.physicsforums.com/threads/modulation-superheterodyning.348519/ukulelethoughtshttps://www.blogger.com/profile/05850992011487114933noreply@blogger.comtag:blogger.com,1999:blog-7590176649168185428.post-43781576717633222242020-03-28T13:11:28.152-04:002020-03-28T13:11:28.152-04:00Ray Moore's book indicates that dual conversio...Ray Moore's book indicates that dual conversion was post WWII. Halli's first was the SX-17 in 1950. 2075 kc then 455 kc. Hammarlund SP600 also 1950 - 3955 and 455 kc IFs. 1952: National HRO-60 2020 and 456 kc; NC183D 1720 and 455 kc. Bill Mearahttps://www.blogger.com/profile/07662500663603350847noreply@blogger.comtag:blogger.com,1999:blog-7590176649168185428.post-81540359335676590632020-03-28T11:46:57.431-04:002020-03-28T11:46:57.431-04:00Question: What's the earliest dual conversion ...Question: What's the earliest dual conversion SW receiver? The oldest one I remember coming across is the Crosley 86CR from 1946, which uses (from memory) 5865 and 165 KHz on the AM/SW bands and the usual 10.7 MHz for FM.N8NMhttps://www.blogger.com/profile/14610901904125808084noreply@blogger.comtag:blogger.com,1999:blog-7590176649168185428.post-71698341835194761512020-03-26T17:17:43.547-04:002020-03-26T17:17:43.547-04:00In this country the largest company manufacturing ...In this country the largest company manufacturing them would probably hold sway for the others to follow. Standards have been established this way as well.<br />Anonymoushttps://www.blogger.com/profile/18066061155057778684noreply@blogger.comtag:blogger.com,1999:blog-7590176649168185428.post-54271207891837416872020-03-26T14:46:57.846-04:002020-03-26T14:46:57.846-04:00https://en.wikipedia.org/wiki/Geneva_Frequency_Pla...https://en.wikipedia.org/wiki/Geneva_Frequency_Plan_of_1975Bill Mearahttps://www.blogger.com/profile/07662500663603350847noreply@blogger.comtag:blogger.com,1999:blog-7590176649168185428.post-1071624506364037382020-03-26T14:18:59.820-04:002020-03-26T14:18:59.820-04:00Re 9kHz European stations.
Australia used to be 1...Re 9kHz European stations.<br /><br />Australia used to be 10kHz spacing but changed on 23rd November 1978. I believe Europe and many other countries changed on the same date.<br /><br />Peter VK2EMU <br />Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-7590176649168185428.post-59053865114260355442020-03-26T13:11:01.777-04:002020-03-26T13:11:01.777-04:00Real men know that the real world is analog. Almo...Real men know that the real world is analog. Almost anybody can use a DSP chip to make a software defined, low power, ultra small, state of the art radio. It takes a real man to step back in time, to use discrete parts and these shiny, vintage,hard to find IF cans, to build an incredibly chunky, but high performance AM or shortwave radio. If this is not your cup of tea, step away now. <br /><br />https://www.bgmicro.com/ACS1667.aspx<br /><br />Ed KC8SBVAnonymousnoreply@blogger.com