); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Hi Blair, A lot depends on your expectations. If you are not worried about extracting the ultimate phase noise and jitter performance you should not have much of a problem. 1. A logic divider (74AC74 or similar) will divide your 10MHz signal. Bias the input to 1/2 Vdd and capacitor couple the 10MHz signal. The 8640 will take 0.5V to 5V Peak to Peak on its external reference so 5V logic is OK, I'd put a 47R resistor in series with the output of the IC and the coax connector. 2. Square wave is not a problem for the 8640. 3. I don't Know, a multi-coupler seems a bit of overkill unless you have a couple lying around ;-). They typically have more sensitivity and less noise than you need. What's the spec of the coupler? Does it provide overall gain? If you have a 'scope stick a signal into it and see what level it starts to compress at. If it's a military design for use near transmitters it should be fine. An output level of 1V Peak to Peak (.7V RMS) is a good compromise output level. You may find that a simple transformer coupled 4 way divider will meet your basic requirement without any amplification. Most commercial dividers are just a "block" amplifier followed by a string of dividers. A possible "off the shelf" solution is a video distribution amplifier, the type used to feed multiple monitors from one source. You need a composite type (or an RGB and split your 10MHz into two (or three) inputs for double (or treble) the number of outputs and use the third channel for your 5MHz). These are cheap (new on eBay for CCTV etc), you just want a basic one, no corrections or adjustments. The input signal should be attenuated to about 1V peak. 4. Yes, if you want the best performance and are going to make precision measurements (HP5370 /2, Wavecrest or SRL TIC's).
HTH, Robert G8RPI. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Rasputin Novgorod Sent: 25 July 2007 16:23 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] 5 MHz from 10 MHz ); SAEximRunCond expanded to false Errors-To: time-nuts-bounces+robert.atkinson=genetix.com+robert.atkinson=genetix.co [EMAIL PROTECTED] Hi Guys: I have a HP Z3801A GPS Receiver Timebase. I was going to feed it into a HF antenna multicoupler, to discipline my Harris RF-1310 exciter, Harris RF-590 receiver, HP-8640 generator, and a bunch of other HP test gear. 1) The HP-Z3801 outputs 10Mhz but the HP-8640 wants 5 mHz. How do it divide it? 2) I presume the HP-Z3801 outputs a sine wave; divider chips will provide a square wave, is this a problem? 3) The HP-Z3801 outputs quite a strong signal; will it overload my HF antenna multicoupler? Will the multi- coupler have enough drive for the other gear? 4) Or should I just quit fooling around and buy a TAPR Distribution Amplifier? <http://www.tapr.org/kits_tadd-1.html> Guidance greatly appreciated, Sincerely /blair VE3CZY ________________________________________________________________________ ____________ Be a better Heartthrob. Get better relationship answers from someone who knows. Yahoo! Answers - Check it out. http://answers.yahoo.com/dir/?link=list&sid=396545433 _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. -------------------------------------------------------- Genetix Limited - Queensway, New Milton, Hampshire, BH25 5NN Registered in England No. 2660050 www.genetix.com Any opinions expressed in this email are those of the individual and not necessarily Genetix Ltd (Genetix) or any company associated with it. This email and any files transmitted with it are confidential and solely for the use of the intended recipient. If you are not the intended recipient or the person responsible for delivering to the intended recipient, be advised that you have received this email in error and that any use is strictly prohibited. If you have received this email in error please notify Genetix by telephone on +44 (0)1425 624600. The unauthorised use, disclosure, copying or alteration of this message is strictly forbidden. This mail and any attachments have been scanned for viruses prior to leaving Genetix network. Genetix will not be liable for direct, special, indirect or consequential damages as a result of any virus being passed on, or arising from alteration of the contents of this message by a third party. -------------------------------------------------------- _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
