I have been using a Tbolt and TAPR TADD-1 for a few years, mainly as an external reference source for my workbench equipment. Just got a SDR radio kit (Ubitx) and trying to calibrate the local oscillators found this annoying substantial 10MHz signal heterodyning with the LO's (45MHz and 12MHz). Taking a look on my SA with just a broad band telescopic antenna in the SA input, I see a 10MHZ at about -55 dBm and no other signals > -120 dBm. The Tbolt is about 4-5' away from the workbench BUT I disconnected everything and it is only connected to the TADD-1 distribution amplifier The TADD has no distribution coaxes attached, it is in the TAPR metal cabinet which I always thought was well shielded and every port has been terminated with 50 Ohm dummy load plugs. When I take the TADD-1 out of the equation and just run the Tbolt into a 50 ohm termination plug, the 10MHz signal on my SA drops down to > -90 dBM. I duplicated this with a Lucent RFTGm-Xo/Rb pair and the TADD-1 with similar results. Has anyone else seen this with their distribution amp?
Jerry _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
