tag:blogger.com,1999:blog-7590176649168185428.post6191767258390288421..comments2024-03-28T08:01:27.111-04:00Comments on SolderSmoke Daily News: Sibeband Inversion: 9 MHz, 5 MHz, and the ARRL HandbookBill Mearahttp://www.blogger.com/profile/07662500663603350847noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-7590176649168185428.post-13593458920471489202012-05-15T00:58:44.212-04:002012-05-15T00:58:44.212-04:00I'll agree with the phasing theory using a 5.5...I'll agree with the phasing theory using a 5.5 MHz SSB generator and a 9 MHz LO to generate either 3.5 LSB or 14.5 USB but since a phasing SSB generator will switch sidebands with the addition of a simple DPDT switch, it would be much easier to use a fixed 9 MHz SSB generator and a 5.0 - 5.5 MHz VFO. Also there's no worry about the RF phasing 'slipping' as the LO frequency changes.<br /><br />On the AC6V website "WHY LSB BELOW 9 MHz AND USB ABOVE" (about half way down the page), 3 entries clarify these issues:<br /><br />Karl-Arne Markstrom SM0AOM<br />Jim N2EY<br />Alan Larson WA6AZP<br /><br />Most of the other stuff under that heading is bogus or at least unclear.<br /><br />73.......Steve Smith WB6TNLSteve "Snort Rosin" Smith WB6TNLhttps://www.blogger.com/profile/01570621886789949035noreply@blogger.comtag:blogger.com,1999:blog-7590176649168185428.post-67733168367846586982012-05-14T05:55:57.924-04:002012-05-14T05:55:57.924-04:00Steve, a 5 MHz tunable IF could have been either a...Steve, a 5 MHz tunable IF could have been either a phasing exciter or mixed up from a 455 kHz crystal or mechanical filter (plus either 4.5 - 5 or 5.5 - 6 MHz as the VFO). <br /><br />The resultant 5 - 5.5 MHz output could be mixed with a bank of crystals for various HF amateur bands. Ditto on receive - crystal controlled converters feeding a tunable IF was a popular way of building a stable high performance amateur band only receiver). <br /><br />Because SSB was most useful for DX having 20m was a must. Mixing with a 9 MHz crystal also providing a bonus 3.5 - 4 MHz (with inverted sideband) which cut costs.<br /><br />By the way SSB for the Radio Amateur (1970) describes using 5.5 MHz xtals for the filter - cheap as these were surplus items. This would have inverted the sideband if subtracted from a 9 MHz VFO. <br /><br />K9STH gives another explanation at http://forums.qrz.com/archive/index.php/t-125756.html with regards to early commercial rigs. 73, Peter VK3YEAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-7590176649168185428.post-5378855356016595982012-05-14T00:08:32.261-04:002012-05-14T00:08:32.261-04:00I sure would like to take a gander at that article...I sure would like to take a gander at that article. <br /><br />How could that configuration work as an SSB exciter? <br /><br />As Chuck Adams would say, "Inquiring minds, etc." <br /><br />73.......Steve Smith WB6TNL<br />"Snort Rosin"Steve "Snort Rosin" Smith WB6TNLhttps://www.blogger.com/profile/01570621886789949035noreply@blogger.com