tag:blogger.com,1999:blog-7590176649168185428.post5385937295999559858..comments2024-03-28T18:51:21.655-04:00Comments on SolderSmoke Daily News: Narrow Band FM on 160 Meters? Using SSB phasing rigs? Bill Mearahttp://www.blogger.com/profile/07662500663603350847noreply@blogger.comBlogger5125tag:blogger.com,1999:blog-7590176649168185428.post-50070694763234648602020-10-27T10:56:42.275-04:002020-10-27T10:56:42.275-04:00Just came across a July 1947 QST article about fm ...Just came across a July 1947 QST article about fm and phase modulation:<br />https://www.rfcafe.com/references/qst/low-frequency-nfm-amateur-radio-july-1947-qst.htmDavid Cowhig WA1LBPhttps://gaodawei.wordpress.com/noreply@blogger.comtag:blogger.com,1999:blog-7590176649168185428.post-3559683992780093402018-08-12T21:38:08.879-04:002018-08-12T21:38:08.879-04:00Solderability
Soldering On
Micro Soldering
W...<a href="https://bit.ly/2N9Dr9e" rel="nofollow">Solderability</a><br><br /> <a href="http://www.soldering-iron.com" rel="nofollow">Soldering On</a><br><br /> <a href="http://www.soldering-iron.com" rel="nofollow">Micro Soldering</a><br><br /> <a href="http://www.soldering-iron.com" rel="nofollow">Wep Soldering</a><br>fghfghhttps://www.blogger.com/profile/06521953009190193572noreply@blogger.comtag:blogger.com,1999:blog-7590176649168185428.post-56313826743667250052016-07-07T16:37:17.915-04:002016-07-07T16:37:17.915-04:00Narrowband FM is super-simple to generate but hard...Narrowband FM is super-simple to generate but hard to receive with homebrew gear (unless you wish to compromise with slope detection on an AM receiver). In this a regen will do better than a direct conversion set. However my understanding is that the noise reduction benefits of NBFM drop with lower bandwidth. Worth experimenting with though. Peter Parkerhttps://www.blogger.com/profile/13413976934040474125noreply@blogger.comtag:blogger.com,1999:blog-7590176649168185428.post-6264476564207945592016-07-07T15:46:45.120-04:002016-07-07T15:46:45.120-04:00Should be a snap to implement as a mode in SDR the...Should be a snap to implement as a mode in SDR then, eh?Dex, ZL2DEXnoreply@blogger.comtag:blogger.com,1999:blog-7590176649168185428.post-28975193523165438042016-07-07T12:55:09.777-04:002016-07-07T12:55:09.777-04:00There was a whole period when narrow band fm was p...There was a whole period when narrow band fm was promoted for HF., Hallicrafters and I think Sonar sold fm/CW HF transmitters. No need for bulky modulators, and since it's not am, no rectification in audio amplifiers. Most people used slope detection, but one of the later HRO receivers, maybe the 50, had an accessory socket for an FM detector, I think National actually sold the module. In reality, people used the socket to add a product detector, a even full blown sideband slicer.<br /><br />Any rig could easily be FM'd, especially by doing it to a VFO.<br /><br />The time was the late forties, into sometime in the fifties. I'm sure the ARRL and Bill Orr Handbooks had construction articles for FM exciters for the HF bands.<br /><br />Note that this is narrower FM than used on 10M, where it is generally used as FM complete with FM receiver and more like 2M FM, except since propagation is more common on 10, there's the snappiness as suddenly things become full quieting.<br /><br />MichaelMichaelhttps://www.blogger.com/profile/13699701261288661640noreply@blogger.com