[450] Fwd: [Moon-Net] Distribution Amplifier

[John Foege]

Interesting discussion on 10 MHz standard timing ref distribution amps and
etc.

---------- Forwarded message ----------
From: Edward R Cole <kl7uw at acsalaska.net>
Date: Wed, Dec 4, 2013 at 3:39 AM
Subject: Re: [Moon-Net] Distribution Amplifier
To: Mike KL6M <melum at alaska.net>, w2drz <w2drz at ramcoinc.com>
Cc: Moon-Net <moon-net at mailman.pe1itr.com>


Mike,

I am using two of the DEMI model 10-4 for 10-MHz
distribution for my station.  One line goes to my
counter & scope for frequency check against a
Rubidium, others to radio equipment.  I have a
couple spare outputs that are terminated with
loads as spares for future expansion.

I found that the output of my OCXO had harmonic
energy so did not look like a sine wave.  The
DEMI filters cleaned that up very nicely.  The
DEMI unit outputs +10 dBm regardless of input
level.  That appears to be a good level for most
equipment that utilize an external reference.

I also have noted that the Apol A32 and Apol VHF
synthesizers appear not to present a 50-ohm
termination.  I found a test point on the synth
board where proper levels can be measured.  The waveform is good there.

I have an A32 on 1296 and VHF synth on 432.  My
K3 uses 10-MHz ext. ref.  One line is dedicated
as LO for a future 600m downconverter, and I am
building a 10-GHz beacon using a A32.

73, Ed - KL7UW



At 02:14 PM 12/3/2013, Mike KL6M wrote:
>Another point on the DEMI unit, it individually amplifies, and THEN
>filters each output so you have a very clean sine wave at each output.  I
>found this to be very important when distributing GPS derived 10MHz.
>
>The output of my GPS looks like a perfect sine wave, but when applied to
>the reference input of a A32 synthesizer caused significant additional
>phase noise.  When I filtered it externally the noise was reduced.
>
>One should probably check 10MHz VSWR on long runs just to make sure no
>distortion is added from that.  Maybe.
>
>73
>
>Mike, KL6M      BP51dc      http://www.qsl.net/kl6m
>
>
> > Hi Steve,
> > DEMI has what you describe now, I use it here and for several years has
> > worked great. called 10-4.
> >
> > http://www.downeastmicrowave.com/cat-frame.htm
> >
> > tom   W2DRZ
> >
> >
> >
> >
> >
> >   ----- Original Message -----
> >   From: Stephen Hanselman
> >   To: Moon-Net ; Moon-net
> >   Sent: Tuesday, December 03, 2013 12:42 PM
> >   Subject: [Moon-Net] Distribution Amplifier
> >
> >
> >   Good Morning,
> >
> >
> >
> >   It seems my company has a need for spreading our 10MHz standard around
> > the building.  So I am in the process of laying out a buffered 1 in 6
> > out distribution amp.  Given the trend to use a GPS or Rubidium clock as
> > a shack standard I figured there might be some community interest is
> > either the bare PCB, a kit, or finished boards.
> >
> >
> >
> >   At this point what I have is about 4x6 inches, each output will have
pi
> > attenuators to set levels, but I have no costs.  The splitter used is
> > $29.00 but the bare PCB cost is unknown. The project is entirely SMD so
> > you’d have to be able to solder small parts.  All caps and resistors
> > are at least 1206.
> >
> >
> >
> >   Yes this is shamelessly self-serving, my shop needs one, I need one,
and
> > if a few more folks wanted them I could get my own costs down.  For
> > anything less than a turnkey finished product the parts will be at cost
> > plus actual shipping(yet to be determined).  If enough folks wanted
> > finished boards (probably 10 minimum) I have a production house that
> > will do the pick&place and run them through a pizza oven
> >
> >
> >
> >   Anyone interested?
> >
> >
> >
> >   Steve KC4SW
> >
> >
> >
> >   73's
> >
> >
> >
> >   Stephen Hanselman, KC4SW
> >
> >   Datagate Systems, LLC
> >
> >   3107 North Deer Run Road #24
> >
> >   Carson City, Nevada, 89701
> >
> >   (775) 882-5117 office
> >
> >   (775) 720-6020 mobile
> >
> >   s.hanselman at datagatesystems.com
> >
> >   www.datagatesystems.com
> >
> >   a Service Disabled, Veteran Owned Small Business
> >
> >   DISCLAIMER:
> >
> >   This e-mail and any attachments are intended only for use by the
> > addressee(s) named herein and may contain legally privileged and/or
> > proprietary information. If you are not the intended recipient, any
> > dissemination, distribution or copying of this e-mail and any
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> > error, please immediately notify me and permanently delete the original
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> >
> >   Sent from my iPad
> >
> >
> >
>
------------------------------------------------------------------------------
> >
> >
> >   _______________________________________________
> >   Moon-Net posting and subscription instructions are at
> > http://www.nlsa.com/nets/moon-net-help.html
> >
> > _______________________________________________
> > Moon-Net posting and subscription instructions are at
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> >
> >
>
>
>_______________________________________________
>Moon-Net posting and subscription instructions
>are at http://www.nlsa.com/nets/moon-net-help.html

73, Ed - KL7UW
http://www.kl7uw.com
dubususa at gmail.com
"Kits made by KL7UW"

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