I ordered two crystals, 35.208 and 35.304 KHz, from Surplus Sales of Nebraska () about a month ago, they are saying the crystals will arrive in a few days. The idea is to make one of those oscillate at 8817*4 KHz and to put SR40 inside my TS-570. The 8830 KHz IF signal will be pulled from the socket for the extra filter, and SR40 will replace the IF/AF part of the transceiver.
What is the best way of pulling the LO frequency 36 KHz down or 60 KHz up? Is this possible at all? If not, I will have to switch to the 96 KHz sampling rate and use the 35.208 KHz crystal at its nominal frequency. Of course, 96 KHz is an overkill since the bandwidth of the roofing filter in TS-570 is 14 KHz, according to the Service Manual.
73 Alex VE3NEA
Alex, VE3NEA