Re: [Elecraft] LSB on 75 Meters (was: US 60 Meter Band Changes...)

2011-11-22 Thread KU4AF
Whatever the genesis of the LSB/USB convention on the ham bands, this conversion scheme wasn't it. Mixing a 9 MHz USB signal with a 5 MHz VFO will produce a USB output on either 4 MHz or 14 Mhz. The sidebands only get inverted in a mixer when you subtract the SSB signal from a higher frequency LO.

Re: [Elecraft] LSB on 75 Meters

2011-11-22 Thread Joe Subich, W4TV
On 11/22/2011 4:04 PM, KU4AF wrote: Whatever the genesis of the LSB/USB convention on the ham bands, this conversion scheme wasn't it. Mixing a 9 MHz USB signal with a 5 MHz VFO will produce a USB output on either 4 MHz or 14 Mhz. The sidebands only get inverted in a mixer when you subtract

Re: [Elecraft] LSB on 75 Meters

2011-11-22 Thread KU4AF
First, let's dispense with the red herring of backward tuning. The VFO does tune backward on 75 but it has nothing to do with sideband inversion. The USB/LSB business works the same way with a fixed LO as with a VFO, and it works as I described. When you mix a 5 MHz signal with a 9 MHz signal,

Re: [Elecraft] LSB on 75 Meters

2011-11-22 Thread Joe Subich, W4TV
Working the sideband part into it with a 9 MHz USB signal and a 5 MHz LO - Suppressed carrier freq: 9.000 minus 5.000 = 4.000 3 kHz modulation tone: 9.003 minus 5.000 = 4.003 No, it's 5.000 - 9.000 = -4.000 and 5.000 - 9.003 = 3.997 and it's 5.500 - 9.000 = -3.500 and 5.500 - 9.003 = 3.497

Re: [Elecraft] LSB on 75 Meters

2011-11-22 Thread Mike Morrow
No, it's ... 5.000 - 9.003 = 3.997 and it's ... 5.500 - 9.003 = 3.497 Not in any universe with which humans are familiar. :-) Mike / KK5F __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help:

Re: [Elecraft] LSB on 75 Meters

2011-11-22 Thread KU4AF
Really? You're going to hang your hat on 5.000 - 9.003 = 3.997 ? Just get a calculator and push the buttons. It's -4.003. Every time! Nothing in the historical record changes this. John, KU4AF Pittsboro, NC Joe Subich, W4TV-4 wrote Working the sideband part into it with a 9 MHz USB signal

Re: [Elecraft] LSB on 75 Meters

2011-11-22 Thread Bob Nielsen
Is this some sort of new math? As I see it, 9.003 minus 5.000 equals 4.003 and 5.000 minus 9.003 equals -4.003. Bob, N7XY On Nov 22, 2011, at 3:44 PM, Joe Subich, W4TV wrote: Working the sideband part into it with a 9 MHz USB signal and a 5 MHz LO - Suppressed carrier freq: 9.000 minus

Re: [Elecraft] LSB on 75 Meters

2011-11-22 Thread Gregg W6IZT
...@mailman.qth.net] On Behalf Of Bob Nielsen Sent: Tuesday, November 22, 2011 7:16 PM To: Elecraft List Subject: Re: [Elecraft] LSB on 75 Meters Is this some sort of new math? As I see it, 9.003 minus 5.000 equals 4.003 and 5.000 minus 9.003 equals -4.003. Bob, N7XY On Nov 22, 2011, at 3:44 PM, Joe Subich

Re: [Elecraft] LSB on 75 Meters

2011-11-22 Thread Tony Estep
On Tue, Nov 22, 2011 at 6:13 PM, KU4AF johnm...@mindspring.com wrote: ...Just get a calculator... Instead of all this mathematical analysis, let's do this the democratic way. Let's have a debate with posturing, table-pounding, and handwaving, and then have a vote on the correct answer.

Re: [Elecraft] LSB on 75 Meters [END of thread.]

2011-11-22 Thread Eric Swartz - WA6HHQ, Elecraft
Folks - End of Thread. Need I say more? :-) 73, Eric List modreator --- www.elecraft.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: