I bought a couple of these RF signal sources to play with:
https://www.ebay.com/itm/Nova-Engineering-NovaSource-RF-Signal-Source-120-160-MHz-X-1-KHz/262691227545?hash=item3d299e0799:g:s58AAOSwXeJYD98nThey arrived today and work ok on a fixed frequency of 122.88MHz.
I've been trying to communicate via the RS232 port. There is no information on the
www.nova-eng.com web page nor on L3 Nova Engineering (both taken from the label attached to the product) but I did find this site:
http://www.novatech-instr.com/Which has very similar instruments with some manuals.
From the manuals it appears that the RS232 should be 19,200 baud 8 bit 1 stop bit and no parity or hardware flow control.
I've tried these (and a variety of other settings) with no luck (using Putty).
Does anyone have any experience with these and do they know how to talk to them? The manuals from the above site list a rather simple protocol but I get no response at all unless I turn the thing off and on and then I get a few random characters.
Any help would be great - it would be nice to be able to set other frequencies!
EDIT: I've also tried using a null modem (though the manuals state that straight through should be used) and this makes things worse (no response even when restarting).