Terminators on empty outputs/connectors

[Clay Autery-2]

Putting in a hardware order...

Question:  Is it recommended to put terminators on all/certain unused
ports?
K3s Antenna ports not being used?  Any others?
GPS Distibution Amp (HP 58516a/HP58517a Unity Gain Distro Amp) ports not
being used?
Output ports on GPSDO and NTP servers (10MHz and PPS)?
Others?

Or are some/all of them self terminating?

73,

--
______________________
Clay Autery, KY5G
[phone]

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[Wes Stewart-2]

I wouldn't say they were self-terminating, but more that they don't care.  If
you have a multi-port passive splitter then I would terminate unused ports to
ensure proper splitting.  Maybe your GPS distribution amp too as it may be an
amp driving a passive splitter inside.

Wes  N7WS

On 5/24/2018 1:46 AM, Clay Autery wrote:

> Putting in a hardware order...
>
> Question:  Is it recommended to put terminators on all/certain unused ports?
> K3s Antenna ports not being used?  Any others?
> GPS Distibution Amp (HP 58516a/HP58517a Unity Gain Distro Amp) ports not being
> used?
> Output ports on GPSDO and NTP servers (10MHz and PPS)?
> Others?
>
> Or are some/all of them self terminating?
>
> 73,
>

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[Clay Autery-2]

The HP GPS Splitters are amplified (unity gain), AND the documents say
that all of the non-powered (typically all but port 1) ports are
terminated with 200 Ohm resistors to simulate an antenna load (This is
part of DC blocking the ports and/or "tricks" the amp into working when
all ports aren't populated. I'm going to assume that on these active
splitters, no termination is required, just port covers to keep them clean.

______________________
Clay Autery, KY5G
[phone]

On 05/24/18 07:53, Wes Stewart wrote:

> I wouldn't say they were self-terminating, but more that they don't
> care.  If you have a multi-port passive splitter then I would
> terminate unused ports to ensure proper splitting.  Maybe your GPS
> distribution amp too as it may be an amp driving a passive splitter
> inside.
>
> Wes  N7WS
>
> On 5/24/2018 1:46 AM, Clay Autery wrote:
>> Putting in a hardware order...
>>
>> Question:  Is it recommended to put terminators on all/certain unused
>> ports?
>> K3s Antenna ports not being used?  Any others?
>> GPS Distibution Amp (HP 58516a/HP58517a Unity Gain Distro Amp) ports
>> not being used?
>> Output ports on GPSDO and NTP servers (10MHz and PPS)?
>> Others?
>>
>> Or are some/all of them self terminating?
>>
>> 73,
>>
>
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[Jim Brown-10]

On 5/24/2018 1:46 AM, Clay Autery wrote:
> Putting in a hardware order...
>
> Question:  Is it recommended to put terminators on all/certain unused
> ports?
> K3s Antenna ports not being used?
No

> Any others?
> GPS Distibution Amp (HP 58516a/HP58517a Unity Gain Distro Amp) ports
> not being used?

It depends on whether it is an amp driving a passive splitter (YES, do
terminate) or multiple amps, one for each output (No).

> Output ports on GPSDO and NTP servers (10MHz and PPS)?
> Others?

Same answer.

73, Jim K9YC
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[Edward R Cole]

DEMI recommends 50-ohm terms on unused outputs of its 4-way 10-MHz
distribution amp.  It uses MAR6 mmic's that output 10mw.

73, Ed

From: Wes Stewart <[hidden email]>
To: [hidden email]
Subject: Re: [Elecraft] Terminators on empty outputs/connectors
Message-ID: <[hidden email]>
Content-Type: text/plain; charset=utf-8; format=flowed

I wouldn't say they were self-terminating, but more that they don't care.? If
you have a multi-port passive splitter then I would terminate unused ports to
ensure proper splitting.? Maybe your GPS distribution amp too as it may be an
amp driving a passive splitter inside.

Wes? N7WS


73, Ed - KL7UW
   http://www.kl7uw.com
Dubus-NA Business mail:
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