On 7 Jan 2015 01:24, Charles Steinmetz csteinm...@yandex.com wrote:
Dave wrote:
At 50 MHz, the loss from the common port is 12.8 dB, and the isolation
between two ports sets of ports is either 38 or 48 dB
To get the worst-case output-to-output isolation, you need to test two
output ports
On 8 January 2015 at 10:03, Charles Steinmetz csteinm...@yandex.com wrote:
Dave wrote:
Yes, but I was aware of this, and that's why I got two different isolation
figures.
What I was pointing out is that there will be *4* different isolation
figures from any one output port, not just two.
Charles is absolutely correct this is what I have seen in these large
splitters.
I have a really nice one that you can take the cover off and look. Lots of
screws.
Regards
Paul
WB8TSL
On Thu, Jan 8, 2015 at 5:03 AM, Charles Steinmetz csteinm...@yandex.com
wrote:
Dave wrote:
Yes, but I was
Dave wrote:
Yes, but I was aware of this, and that's why I got two different isolation
figures.
What I was pointing out is that there will be *4* different isolation
figures from any one output port, not just two. The lowest will be
to the one electrically adjacent output, next (a bit
-nuts@febo.com
Date: Sun, 4 Jan 2015 08:29:34 -0500
Subject: Re: [time-nuts] Any reason not to use one power amplifier and
splitter for distribution amplifier?
A cheap and dirty equivalent of a pass thru terminator that I use is a BNC t
connector with a 52 ohm bnc terminator. I guess you could use
@febo.com
Subject: Re: [time-nuts] Any reason not to use one power amplifier and
splitter for distribution amplifier?
Hi
Any time you run into terms like “low noise” it pays to think about what that
means to you and your system. A quick scan of the posts here over the years
will show
On 4 January 2015 at 02:37, Bob Camp kb...@n1k.org wrote:
Hi
On Jan 3, 2015, at 6:09 PM, Dr. David Kirkby (Kirkby Microwave Ltd)
drkir...@kirkbymicrowave.co.uk wrote:
I was looking to make a 10 MHz distribution amp to feed test equipment with
the output of a GPSDO.
I see this
Dave wrote:
At 50 MHz, the loss from the common port is 12.8 dB, and the isolation
between two ports sets of ports is either 38 or 48 dB
To get the worst-case output-to-output isolation, you need to test
two output ports that are electrically adjacent (i.e., that share the
same last 2:1
Just to say, the comment on the graphs that the VNA covers 50 MHz to 20
MHz, is obviously wrong. My 8720D covers 50 MHz to 20 GHz.
I do have another couple of VNAs here that cover 10 MHz. I will do some
more measurements, with a more suitable VNA when I have both splitters here
and some time for
Bruce wrote:
A 10nF cap connected to the emitter winding [instead of the collector]
avoids capacitively coupling collector power supply noise to the output
(assuming that the collector supply isnt ground.).
Good point. I take pains with power supply design and very rarely
have problems with
there on the
surplus market selling for a small fraction of their original cost.
Cheers;
Thomas Knox
From: bill.ric...@verizon.net
To: time-nuts@febo.com
Date: Sun, 4 Jan 2015 08:29:34 -0500
Subject: Re: [time-nuts] Any reason not to use one power
amplifier andsplitter for distribution
Date: Sun, 4 Jan 2015 08:29:34 -0500
Subject: Re: [time-nuts] Any reason not to use one power amplifier and
splitter for distribution amplifier?
A cheap and dirty equivalent of a pass thru terminator that I use is a BNC t
connector with a 52 ohm bnc terminator. I guess you could use
of their original cost.
Cheers;
Thomas Knox
From: bill.ric...@verizon.net
To: time-nuts@febo.com
Date: Sun, 4 Jan 2015 08:29:34 -0500
Subject: Re: [time-nuts] Any reason not to use one power amplifier and
splitter for distribution amplifier?
A cheap and dirty equivalent of a pass thru
A cheap and dirty equivalent of a pass thru terminator that I use is a BNC t
connector with a 52 ohm bnc terminator. I guess you could use a CATV 75 ohm
F type with an adapter. Maybe that combination would produce too much
garbage.
73,
Bill, WA2DVU
Cape May
---
This email has been checked
Dave wrote:
I was looking to make a 10 MHz distribution amp to feed test equipment with
the output of a GPSDO.
* * *
16-way Minicircuits splitter on eBay which I got for $40. I guess the loss
is around 12 dB.
Is there any reason not to just drive that with 22 dBm or so of power to
get
On Sunday, January 04, 2015 03:39:48 AM Charles Steinmetz wrote:
Dave wrote:
I was looking to make a 10 MHz distribution amp to feed test
equipment with
the output of a GPSDO.
* * *
16-way Minicircuits splitter on eBay which I got for $40. I guess the loss
is around 12 dB.
Hi
On Jan 3, 2015, at 10:37 PM, paul swed paulsw...@gmail.com wrote:
Dave
I am sure there will be many answers. But yes indeed it will work fine. All
of the outputs should have the same delay also and that may be useful.
There really are the two approaches. The big power amp thats a 1/2
Friends in Time,
There's been a large amount of discussion about distribution amps on
this list.
People may be using them just because that's what's done. So I ask you:
What are we trying to isolate? The destination devices do not generate
an interfering signal, n'est ce pas?
The receiving
Almost all frequency counters have an internal source which is a potential
means of injection locking an external reference if the isolation between the
internal source and the external source is inadequate. High impedance taps on a
single terminated line ensure that the isolation between such
I was looking to make a 10 MHz distribution amp to feed test equipment with
the output of a GPSDO.
I see this
http://m.ebay.com/itm/201244302355
16-way Minicircuits splitter on eBay which I got for $40. I guess the loss
is around 12 dB.
I actually bought another for $35 which was similar but
Hi
On Jan 3, 2015, at 6:09 PM, Dr. David Kirkby (Kirkby Microwave Ltd)
drkir...@kirkbymicrowave.co.uk wrote:
I was looking to make a 10 MHz distribution amp to feed test equipment with
the output of a GPSDO.
I see this
http://m.ebay.com/itm/201244302355
16-way Minicircuits
Dave
I am sure there will be many answers. But yes indeed it will work fine. All
of the outputs should have the same delay also and that may be useful.
There really are the two approaches. The big power amp thats a 1/2 Watt you
are talking and the many small amps as in the distributed mode.
My 2 cents. I just repurposed an RGB video distribution amp for use
with a rubidium. The board has three EL2070 (200 MHz BW) amps, each
one feeds several BNC jacks for RGB output. I only need three
separate, isolated outputs, so I am feeding the rubidium into all
three EL2070's and only taking one
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