It was correctly pointed out to me off-list that my example of a 7 MHz
"IF" would tax the input filters in order to get the best image
rejection. I used that example since it was the first band that starts
at "000".
The filtering requirement could be relaxed considerably by using a 28
MHz "IF". The PLL synth chip I am looking at is good to 185 MHz...
moving the LO to 28.5 - 56 MHz would cover .5 - 28 MHz... the converter
wouldn't have to cover 28-30 MHz since the K2 does that. It would also
keep the sidebands consistent for all frequencies.
I was thinking of using a PIC to control the counter in the PLL, UP/DN
buttons to change bands... and a 3 1/2 digit LED display to show the
first three digits of the receive frequency.
Larry N8LP
Phil LaMarche wrote:
Even though I have a Collins R-388 that I use on AM, I would also purchase a
receiver immediately.
Phil K2 & KX-1
Philip LaMarche
LaMarche Enterprises, Inc.
www.instantgourmetspices.com
727-944-3226
(800) 395-7795 pin 02
Cell 727-510-5038
FAX- 727-937-8834
N.A.S.F.T # 30210
W9DVM
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