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<DIV><FONT size=4>AND.......another way to arrive at the same "zero-beat" USB
and LSB frequencies, without moving the cursor when switching sidebands (like
what Drake did with the TR-4, etc.) is to have ONE BFO crystal and use separate
filters for USB/LSB. More expensive, though. Think of it
as a receiver with passband tuning (with just 2 discrete passbands, though) and
one BFO frequency........and ONE fiducial mark above the VFO scale.
When set up properly, the Heath scheme works quite well.</FONT></DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 8/3/2016 7:03:18 A.M. Pacific Daylight Time,
heath@puck.nether.net writes:</DIV>
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<DIV id=yui_3_16_0_ym19_1_1470231299634_5523><SPAN>The BFO frequency shifts
when the sideband is changed and the LMO frequency has to change by the same
amount to keep the dial calibration from shifting. In some examples, in
other brands, instead of shifting the VFO frequency, there are actually
2-fiducial lines on the dial, 1 for LSB and the other for USB.</SPAN></DIV>
<DIV id=yui_3_16_0_ym19_1_1470231299634_5523><SPAN><BR></SPAN></DIV>
<DIV id=yui_3_16_0_ym19_1_1470231299634_5523><SPAN><BR></SPAN></DIV>
<DIV></DIV>
<DIV id=yui_3_16_0_ym19_1_1470231299634_5524> </DIV>
<DIV id=yui_3_16_0_ym19_1_1470231299634_5525 class=signature>Glen,
K9STH </DIV>
<DIV id=yui_3_16_0_ym19_1_1470231299634_5525 class=signature><BR></DIV>
<DIV id=yui_3_16_0_ym19_1_1470231299634_5525 class=signature>Website:
http://k9sth.net</DIV>
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class=qtdSeparateBR><BR><BR></DIV>
<DIV id=yui_3_16_0_ym19_1_1470231299634_5738 class=yahoo_quoted
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<B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> Robert Myers
<rsmyers@rogers.com><BR><B><SPAN
style="FONT-WEIGHT: bold">To:</SPAN></B> heathkit@yahoogroups.com;
heath@puck.nether.net; heathkit@mailman.qth.net <BR><B><SPAN
style="FONT-WEIGHT: bold">Sent:</SPAN></B> Tuesday, August 2, 2016 10:13
PM<BR><B id=yui_3_16_0_ym19_1_1470231299634_5740><SPAN
id=yui_3_16_0_ym19_1_1470231299634_5739
style="FONT-WEIGHT: bold">Subject:</SPAN></B> [Heathkit] SB-401 / SB-303 LMO
question<BR></FONT></DIV>
<DIV id=yui_3_16_0_ym19_1_1470231299634_5741
class=y_msg_container><BR>Hi<BR><BR><BR><BR>I have an SB-303 and SB-401
working together as a transceiver in 'locked'<BR>mode with the (same)
operating frequency for both the Rx and Tx controlled<BR>by the Rx. Can
someone explain to me why the LMO frequency on the SB-303 is<BR>suppose to
change slightly when moving between USB and LSB, please? I<BR>thought I
sort of understood this one
time.<BR><BR><BR><BR></DIV></DIV></DIV></DIV></DIV><BR><BR>_______________________________________________<BR>Heath
mailing
list<BR>Heath@puck.nether.net<BR>https://puck.nether.net/mailman/listinfo/heath<BR></FONT></BLOCKQUOTE></DIV></FONT></BODY></HTML>