Bill - This thing does have 18 outputs, so yes, I did mean one piece of equipment per one/each output. I do not know how that could have been misconstrued. Since I was talking about frequency the simultaneous fits as I indicated that a constant phase shift between outputs, to me is not relevant. If I was using it for a timing reference then I would be more cautious. I am well aware of mismatches occurring due to paralleling 50 ohm inputs or outputs. My post was not intended to bring out an academic and non relevant debate. I simply wanted to alert potential customers for a distribution amplifier to this one which seemed pretty cheap for what it does. Since it is for HDTV, I expect that all inputs and outputs are probably 75 ohms. That would explain the loss I was observing as I was using a 50 ohm instrument to measure the output power. I can live with the 1.5 to 1 VSWR at 10 MHz just fine. I wonder if you even looked at the URL, or did you just start your negativism out of habit. - Mike
Mike B. Feher, N4FS 89 Arnold Blvd. Howell, NJ, 07731 732-886-5960 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Bill Hawkins Sent: Saturday, September 24, 2005 12:54 PM To: Discussion of precise time and frequency measurement Subject: RE: [time-nuts] Distribution Amp Mike Feher said, " It will be ideal to drive a bunch of test equipment simultaneously from the same source. " You mean one equipment per output, right? Paralleling 50 ohm inputs will result in the wrong termination resistance for a cable. This may not be a problem for a 10 MHz sine wave, as long as the direct coupled emitter follower can handle the load. I have used networks where the devices are high impedance. The cable sees 50 ohms at both ends. Some test equipment has an optional 50 ohm terminator, for use as a high impedance device. Suppose I have 3 frequency synthesizers that have optional terminators. Are there any ill effects, except phase shift, from putting them all on the standard's output, if only the end one is terminated? Has anyone tried the high impedance distribution scheme? Seems like "simultaneously" would be relative, unless the distribution cables are all of the same length. Bill Hawkins _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts