Allwave 23 RF alignment - EH Scott Radio Enthusiasts2024-03-29T12:44:34Zhttps://ehscott.ning.com/forum/topics/allwave-23-rf-alignment?commentId=3925821%3AComment%3A55447&feed=yes&xn_auth=noAll good questions. I was a b…tag:ehscott.ning.com,2017-01-24:3925821:Comment:558622017-01-24T16:57:01.020ZThomas Dayhttps://ehscott.ning.com/profile/ThomasDay
<p>All good questions. I was a bench tech for Heathkit in the late '60's thru '74. We used a Boonton 202H RF generator for FM. AM was a Heathkit generator. The AM sections of most of their Hi Fi receivers were average at best, altho some of the separate tuners were very good. For the FM, you could usually get the sensitivity down to 1.8 microvolts, which was their specification. Then someone decided that the femtowatt was the way to measure FM sensitivity. Never did figure that one out. For…</p>
<p>All good questions. I was a bench tech for Heathkit in the late '60's thru '74. We used a Boonton 202H RF generator for FM. AM was a Heathkit generator. The AM sections of most of their Hi Fi receivers were average at best, altho some of the separate tuners were very good. For the FM, you could usually get the sensitivity down to 1.8 microvolts, which was their specification. Then someone decided that the femtowatt was the way to measure FM sensitivity. Never did figure that one out. For the Scott, the dummy would only affect the RF section. The IF is isolated enough to not be affected by the RF alignment. For the dummy, leads should be as short as possible.</p>
<p>Thom</p> New info to me. I now have…tag:ehscott.ning.com,2017-01-24:3925821:Comment:556542017-01-24T01:40:44.323ZDavid C. Polandhttps://ehscott.ning.com/profile/DavidCPoland
<p>New info to me. I now have an older solid state HP frequency generator (heavy and the size of a 1979s stereo receiver) . Even with this HP sg gen I should make the suggested RMA dummy antenna to improve the matching of my HP to the radio designed for a long wire antenna (a Scott) ?. The purpose being to avoid mis-alignment.</p>
<p>Are we talking a noticeable alignment difference in practice? </p>
<p>This impact the IF alignment and IF diode too or just the RF stage?</p>
<p>If I locate…</p>
<p>New info to me. I now have an older solid state HP frequency generator (heavy and the size of a 1979s stereo receiver) . Even with this HP sg gen I should make the suggested RMA dummy antenna to improve the matching of my HP to the radio designed for a long wire antenna (a Scott) ?. The purpose being to avoid mis-alignment.</p>
<p>Are we talking a noticeable alignment difference in practice? </p>
<p>This impact the IF alignment and IF diode too or just the RF stage?</p>
<p>If I locate a 1/2 inch diameter hollow tube, any reason not to mount the capacitor inside the tube? </p> Thanks for this information.…tag:ehscott.ning.com,2017-01-23:3925821:Comment:554472017-01-23T18:01:51.032ZThomas Dayhttps://ehscott.ning.com/profile/ThomasDay
<p>Thanks for this information. Most of my experience has been with newer radios that have their own antenna, or FM systems and generators that have the standard 300 or 50 ohm output Z.</p>
<p>Thom</p>
<p>Thanks for this information. Most of my experience has been with newer radios that have their own antenna, or FM systems and generators that have the standard 300 or 50 ohm output Z.</p>
<p>Thom</p> Here is another link with mor…tag:ehscott.ning.com,2017-01-23:3925821:Comment:555222017-01-23T00:51:42.853ZDave Satternesshttps://ehscott.ning.com/profile/DaveSatterness
<p>Here is another link with more information.</p>
<p><a href="http://www.antiqueradios.com/forums/viewtopic.php?t=33500">http://www.antiqueradios.com/forums/viewtopic.php?t=33500</a></p>
<p>B/r</p>
<p>Dave</p>
<p>Here is another link with more information.</p>
<p><a href="http://www.antiqueradios.com/forums/viewtopic.php?t=33500">http://www.antiqueradios.com/forums/viewtopic.php?t=33500</a></p>
<p>B/r</p>
<p>Dave</p> Check this link for explanati…tag:ehscott.ning.com,2017-01-22:3925821:Comment:557522017-01-22T22:52:41.132ZDave Satternesshttps://ehscott.ning.com/profile/DaveSatterness
<p>Check this link for explanation and schematic for "Dummy":</p>
<p><a href="http://www.ai4fr.com/main/page_electronic_repair_rma_schematic.html" target="_blank">http://www.ai4fr.com/main/page_electronic_repair_rma_schematic.html</a></p>
<p>B/r</p>
<p>Dave</p>
<p>Check this link for explanation and schematic for "Dummy":</p>
<p><a href="http://www.ai4fr.com/main/page_electronic_repair_rma_schematic.html" target="_blank">http://www.ai4fr.com/main/page_electronic_repair_rma_schematic.html</a></p>
<p>B/r</p>
<p>Dave</p>