Satgen57 Pacsat Reception/Listener Problems Several satellite listeners are experiencing problems getting equipment together to monitor Oscars 14 to 20. The biggest difficulties are :- BPSK RECEPTION (all satellites except Uosat3 UO14 and, Uosat UO-15 ) You must have automatic frequency control auto tuning your receiver to follow the rapidly dopplering signal. You can do this if you use a transceiver because almost all have up/down frequency control 10Hz or 100Hz steps connectable direct to the AFC on G3RUH's Fuji modem. BUT I know of no RECEIVER which has this feature. You can use the meter on the RUH modem as a tuning guide but even as I have it arranged with Fuji modem lock light green, tune up light red and tune down light amber, hand tuning is still hit or (mostly ) miss. Equally important. Do not spend your pennies on those tuning aids which drive from a computer program via an RS232 port and something like CAT. Unless your computer prediction is accurate to within 5 seconds of time ( which they never can be as a differential doppler experiment soon reveals), you always lose tuning near closest point of approach. If anyone knows of a Receiver which can be driven by the RUH modem please let me know. Remember that you must also modify your TNC, disconnecting its own internal modem. The G3RUH notes provided with the Fuji modem tell you how to do this. It is a solder and cutters job. 9600 FSK RECEPTION. You can hand tune this signal in 5KHz or better still 1KHz steps. AFC is not absolutely essential. BUT you must go inside your priceless receiver with cutters and soldering iron and connect an output direct from the Rx discriminator to the G3RUH modem. Modifying the TNC is much the same as the procedure used with the Fuji modem, but be careful your Tx Clock output from the TNC must be 153.6 KHz ( not the easy to obtain 19.2 KHz used by the Fuji modem ). General Points. Please remember that even where a TNC advertises an External modem socket ( Eg PK232). This socket has to be connected by going inside and soldering up new connections on JP4 JP5 and JP6 , and worse still, you have to go inside amongst the chips to get Tx Clock. In addition you also require new connection leads from your TNC to the modem you use ( I now regret using fragile DIL plugs and will go to Computer D type plugs at my next rebuild ), and, you need a lead from your Rx to your modem, probably from a spare plug on the back of the Rx at 9600 bps, or direct from the phones socket in the case of BPSK. So please please be very careful to check before you purchase. It is too late when you have paid for the stuff STOP PRESS. Uosat3 UO14 Digipeat off, software being tested. Good long 9600 transmissions down. UO15 tests to prove command link by altering Rx L osc now proceeding. Pacsat PO16 Lusat LO19 both digipeating, telemetry now binary, Weber WO18 binary telemetry. JAS1-B FO20 often on mode JA for SSB and CW, but rarely on JD Digital. Dove not yet reported operational.Will be looking for it on S Band this next week. 73 de John GM4IHJ@GB7MAC