Hi Perrier It's a WWVB receiver, not Loran, with a built in phase comparator, hence the strip chart, that can be used to compare its own oscillator or a local input with WWVB, and is another unit affected by the WWVB changes. Those switches on the front panel select an output frequency provided by internal dividers. Manual here..... http://www.spectracomcorp.com/Support/HowCanWeHelpYou/Library/tabid/59/Defau lt.aspx?EntryId=123 However, the 8164 does have some limitations as highlighted in John Ackerman's very interesting observations here..... http://www.febo.com/time-freq/wwvb/spectracom/ Regards Nigel GM8PZR In a message dated 26/06/2013 03:31:03 GMT Daylight Time, sandeenpa@yahoo.com writes: List, There are several Spectracom 8164 receiver available on Ebay. My question: on the front panel bank of frequency selection switches, the left hand switch is marked .1MHz. Is that really a 100 KHz (for LORAN) setting or is it really tuned to WWVB? If it truly is tuned to 100KHz can it be hacked to 60KHz in a reasonably practical manor? Regards, Perrier ________________________________ _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.