[time-nuts] GPSDO 10 MHz Distribution Amp

dave powis g4hup at btinternet.com
Sun Jun 21 19:38:58 EDT 2009


Hi Jim,

Thanks for the enquiry.  I do prefer to supply kits, as I am not a full time business, and need to work for a living!  However, on request I do build units, so if that is what you want, I can quote for that.  

Cost for the DA1-4L assembled will depend on the connectors you want fitted - if you note from the page, I don't supply connectors with the kit, since some folks want BNC's to fit in their systems, while others want SMA's.   Let me know what connector you are interested in, and where the finished unit is to be shipped to, and I'll put a quote together.

Best 73,
Dave, G4HUP




________________________________
From: Don Key <don.key at ntlworld.com>
To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
Sent: Monday, 22 June, 2009 12:14:23 AM
Subject: Re: [time-nuts] GPSDO 10 MHz Distribution Amp

Hi Dave

Do you supply your DA1-4L distribution amp as a ready-built unit?
Your PDF Technical manual says you do, but there are only prices for the kits on your ordering page.
Cheers.

Jim.
----- Original Message ----- From: "dave powis" <g4hup at btinternet.com>
To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
Sent: Sunday, June 21, 2009 5:34 PM
Subject: Re: [time-nuts] GPSDO 10 MHz Distribution Amp


Hi Paul,

Sounds a reasonable approach to me where an equal 2 way split is needed, and you already have adequate signal level available.  May not be up to 'time-nuts' precision etc, but it is a practical method that will give what you need.  If you ever need to remove one Rig, just remember to terminate the unused split output in 50R!

However, when you get yourself an analyser, sig gen or counter that takes the 10MHz reference, then you will need a DA!  Comeback to me (http://g4hup.com) or TAPR then!

73,
Dave

http://g4hup.com




________________________________
From: Paul Christensen <w9ac at arrl.net>
To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
Sent: Sunday, 21 June, 2009 5:18:51 PM
Subject: [time-nuts] GPSDO 10 MHz Distribution Amp

In the next couple weeks, I plan on distributing the output of my GPSDO to a pair of Icom transceivers.  I've thought about using a DA like the TAPR TADD-1, but it seems that I can simply split the output of the +13 dBm GPSDO with a Z=50, 3dB equal power divider, that will yield an output of ~ +9.5 dBm to each transceiver.

I can't foresee any port isolation issues that would make necessitate the use of the DA for this application and the 3 dB "hit" in level to each transceiver still seems reasonable for proper transceiver operation.  Am I not considering something important?  Also, I do not want to add any noise with such a distribution that would in any way destroy the excellent phase noise characteristics of my GPSDO.  Thoughts?

Paul, W9AC

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