[Collins] WARC XTALS for KWM-2A

[AI2Q]

Just a quick clarification.

The SiLabs Si570 is NOT a DDS chip; it is a VCXO. A DDS chip typically has 
more output spurs (depending on how fast it is clocked; faster is better) 
but can QSY virtually instantaneously. The Si570, in contrast, has lower 
spurious output, and can be QSYd , but not as rapidly as a DDS.

I use the Analog Devices AD9951 DDS in my homebrew xcvr. Fabulous device!  I 
can split frequencies and key the rig at 30 wpm, and the chip follows along 
flawlessly.

I use the Si570 in my Softrock xcvr, and it works really nicely. Should work 
well in Collins VFO/LO applications.

Vy 73, AI2Q, Alex
Member: ARRL, FOC, RSGB, CWops, QRP-L, Antique Wireless Association, New 
England Radio Discussion Society, DXCC Honor Roll, 16ØM DXCC, 8ØM DXCC
http://home.roadrunner.com/~alexmm