Re: [time-nuts] 10 MHz clock distribution for the lab

Russ wrote: The HP 5334B has a 1k Ohm input impedance shunted by <20 pf it wouldn't hurt to terminate this input This is pretty typical for reference inputs on test equipment. The idea is that one 50 ohm source can feed a number of instruments using nothing but a series of Tee connectors, w

Re: [time-nuts] 10 MHz clock distribution for the lab

Thanks to everyone who provided input, I thought it might be a worthwhile topic. The Fluke 6060B I have specs the Reference input at 50 Ohm and accepts several frequencies, a nice feature. The HP 5334B has a 1k Ohm input impedance shunted by <20 pf it wouldn't hurt to terminate this input, and will

Re: [time-nuts] 10 MHz clock distribution for the lab

I think the same could be said for using 75 ohm cable. One could run quad shield rg-6 with BNC connectors in the lab. It will have lass leakage then even the best rg58. then you can terminate as required. The quad shield is foil-braid-fiol-braid and is even better then the 100% coverage conve

Re: [time-nuts] 10 MHz clock distribution for the lab

Hi all , normally the external frequency standard input are not 50 OHms , but all the distribution amplifier have 50 Ohms of standard output impedance. This because the standard cables used to connect the devices are 50 ohms. Case one: External Zi input 50 ohm: direct connection with rg58 cable. C

Re: [time-nuts] 10 MHz clock distribution for the lab

Just a couple of comments from a RF guy and FMT-nut 10 MHz clock distribution for the lab In the small coax cables one might consider RG-223. This is a 1/4 inch more or less diameter cable that features two concentric braided shields. Each is a very dense weave and is silver plated. This

Re: [time-nuts] 10 MHz clock distribution for the lab

External reference inputs are definitely not all '50-ohms.' 'Learned the hard way. You need to read the specs on each piece of equipment. Input impedances will vary all over the map, even within the HP line. -Don Hal Murray wrote: > > c...@omen.com said: > > I have a FlexRadio

Re: [time-nuts] 10 MHz clock distribution for the lab

I am using, with no problems a used modular video amp I purchased on ebay (Claimed power supply problem but actually worked fine). As is common with video, the inputs are loop through, each module has 8 outputs, with as many looped and terminated as necessary. Certainly not up to Boulder standards

Re: [time-nuts] 10 MHz clock distribution for the lab

c...@omen.com said: > I have a FlexRadio 1500, Racal 1992 counter, HP 3586, Advantest U3641, and > Gigatronics 6061A daisy-chained off my Thunderbolt. Don't throw out those > BNC T connectors. I thought most boxes would have an internal 50 ohm terminator so at first, I'm a bit surprised that i

Re: [time-nuts] 10 MHz clock distribution for the lab

I'm on the road right now and don't have access to any data to support or expand upon this statement but I've found that a passive splitter out performs both of my hp 5087 distribution amps as long as you can live with the signal loss. In turn I recall that using the distribution amps worked b

Re: [time-nuts] 10 MHz clock distribution for the lab

On 04/18/2013 09:55 AM, Russ Ramirez wrote: At what point does one require a distribution amp? My TBolt currently provides a reference clock for 2 instruments, and I know of no issues. Since the unit came with the 1:2 Mini-Circuits splitter, I expected this to be the case. If I switched to a ZFSC

[time-nuts] 10 MHz clock distribution for the lab

At what point does one require a distribution amp? My TBolt currently provides a reference clock for 2 instruments, and I know of no issues. Since the unit came with the 1:2 Mini-Circuits splitter, I expected this to be the case. If I switched to a ZFSC-4-1