Re: [time-nuts] Frequency generator and counter on same external reference
Two rules to follow. 1 - use well shielded cables for the 10 MHz distribution if you wish to receive WWV 10 off the air. The skinny cables used for Ethernet generally don't cut it. 2. Most instruments have a high impedance 10 MHz input. Put them in the middle with T connectors left over from your 10 base T days. If you have an instrument that terminates the 10 MHz input, it goes last. Otherwise use a terminator at the end. I have an Advantest spectrum analyzer, HP selective level meter, Racal-Dana counter, Flexradio 1500, and Gigatronics generator daisy chained from a Thunderbolt. Plenty of signal, and the fat (well shielded) cables let me listen to WWV. 08/12/2012 11:30 Thanks for that Chuck, appreciated. -- Best Regards, Chris Wilson. ___ 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.
[time-nuts] Frequency generator and counter on same external reference?
29/11/2012 09:40 I don't think this is an issue, but thought it best to ask. I am repairing an 18GHz counter and it has a 10MHz external reference port. So does my elderly Marconi 2019A sig gen. Is there any potential issue having them both referenced off my Thunderbolt GPS referenced standard, at the same time? Thanks. -- Best Regards, Chris Wilson. mailto: ch...@chriswilson.tv ___ 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.
Re: [time-nuts] Frequency generator and counter on same external reference
Good heavens, no. By doing so, they both have the same reference and the measuremets actually means something. I have a stack of HP stuff (3586, 3386 and assorted counters) all T'd off my Tbolt without issue. The only caveat is that you don't put too much stuff across the T-bolt output so as to load it down to the point where some device can't get clocking. Before you hit that point, you may need a high quality (low jitter) distribution amp in the timing chain. Date: Thu, 29 Nov 2012 09:42:39 + From: Chris Wilson Subject: [time-nuts] Frequency generator and counter on same external reference? I am repairing an 18GHz counter and it has a 10MHz external reference port. So does my elderly Marconi 2019A sig gen. Is there any potential issue having them both referenced off my Thunderbolt GPS referenced standard, at the same time? ___ 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.
Re: [time-nuts] Frequency generator and counter on same external reference
Good heavens, no. By doing so, they both have the same reference and the measuremets actually means something. I have a stack of HP stuff (3586, 3386 and assorted counters) all T'd off my Tbolt without issue. The only caveat is that you don't put too much stuff across the T-bolt output so as to load it down to the point where some device can't get clocking. Before you hit that point, you may need a high quality (low jitter) distribution amp in the timing chain. 29/11/2012 15:44 I thought it would be fine, but thought and know can be poles apart at my level of knowledge :) Thanks for that. -- Best Regards, Chris Wilson. ___ 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.
Re: [time-nuts] Frequency generator and counter on same external reference
Two rules to follow. 1 - use well shielded cables for the 10 MHz distribution if you wish to receive WWV 10 off the air. The skinny cables used for Ethernet generally don't cut it. 2. Most instruments have a high impedance 10 MHz input. Put them in the middle with T connectors left over from your 10 base T days. If you have an instrument that terminates the 10 MHz input, it goes last. Otherwise use a terminator at the end. I have an Advantest spectrum analyzer, HP selective level meter, Racal-Dana counter, Flexradio 1500, and Gigatronics generator daisy chained from a Thunderbolt. Plenty of signal, and the fat (well shielded) cables let me listen to WWV. On 11/29/2012 07:01 AM, Tom Clifton wrote: Good heavens, no. By doing so, they both have the same reference and the measuremets actually means something. I have a stack of HP stuff (3586, 3386 and assorted counters) all T'd off my Tbolt without issue. The only caveat is that you don't put too much stuff across the T-bolt output so as to load it down to the point where some device can't get clocking. Before you hit that point, you may need a high quality (low jitter) distribution amp in the timing chain. Date: Thu, 29 Nov 2012 09:42:39 + From: Chris Wilson Subject: [time-nuts] Frequency generator and counter on same external reference? I am repairing an 18GHz counter and it has a 10MHz external reference port. So does my elderly Marconi 2019A sig gen. Is there any potential issue having them both referenced off my Thunderbolt GPS referenced standard, at the same time? ___ 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. -- Chuck Forsberg WA7KGX N2469R c...@omen.com www.omen.com Developer of Industrial ZMODEM(Tm) for Embedded Applications Omen Technology Inc The High Reliability Software 10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430 ___ 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.
Re: [time-nuts] Frequency generator and counter on same external reference
Kind of funny you bring that up. I have an old Fluke 1900A counter (plastic case) that radiates 10mhz clock that deafens my receiver. It only took me a week to find the intermittent source of interference Boy, did I feel stupid... - Date: Thu, 29 Nov 2012 08:45:04 -0800 From: Chuck Forsberg Subject: Re: Frequency generator and counter on same external reference Two rules to follow. 1 - use well shielded cables for the 10 MHz distribution if you wish to receive WWV 10 off the air ... ___ 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.
