[hpsdr] Fwd: Horton Local Oscillator

[Alex]

Are we saying to have separate VCOs on each HORTON, MERCURY, and CASMIR?
Why can't we go with the idea on an earlier posting by WB6TBU and let GIBRALTAR have a single uWave VCO and divide down on the board and distribute each via an LVDS bus (mini-coax). Given the right FPGA on GIBRALTAR we could have multiple user-programmable clock signals distributed via LVDS in addition to the 10MHz standard reference on ATLAS.

Alex, N3NP

----- Original Message ----
From: Philip Covington <p.covington at gmail.com>
To: High Performance Software Defined Radio Discussion List <hpsdr at hpsdr.org>
Sent: Saturday, June 17, 2006 8:49:11 AM
Subject: [hpsdr] Fwd: Horton Local Oscillator

***** High Performance Software Defined Radio Discussion List *****

<Posted on behalf of Phil VK6APH>

I've had a closer look at Phil N8VB suggestion of dividing down a VHF
oscillator as a way of generating the I/Q switching signals for
Horton.  This looks like an excellent idea so I've documented it more
fully and added some discussion.

The paper is at

< http://216.92.71.47/HPSDR/TEMP_STUFF/Horton%20Local%20Oscillator.doc >

I may have missed something obvious so please go over my logic
carefully.  We need some Googlers to hunt down suitable VCOs, compare
phase noise etc.

It's been many years since I've designed a PLL and I'm sure there are
tools out there now that will simplify the design of the loop filter
and derive the performance.  If any one has this expertise it would be
interesting to see how this performs.

Thanks to Phil C for such a neat idea!

73's Phil...VK6APH
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