[amsat-bb] RX-only Antenna "tee" connector?

Scott scott23192 at gmail.com
Wed Jan 11 07:20:34 UTC 2017

I've never heard of such a thing - thank you so much for the great info! 
Looks like a very worthwhile project.

I also have a separate power feed to the pre-amp, so hopefully I won't have 
a BIAS-T accident.  I'll certainly keep that in mind, though!


-----Original Message----- 
From: PE0SAT | Amateur Radio
Sent: Wednesday, January 11, 2017 1:42 AM
To: Scott
Cc: amsat-bb at amsat.org
Subject: Re: [amsat-bb] RX-only Antenna "tee" connector?

Hi Scott,

I use a power-splitter
(http://www.pe0sat.vgnet.nl/antenna/power-splitter/) in reverse.

So two receivers connected to the same antenna via this splitter.

This, as expected will drop down the signal with 3db but leaves the
impedance at 50 ohm.

Make sure you don't, by accident, TX or enable a BIAS-T on such a setup.
I have a complete separate DC supply to the pre-amp.

Antenna -> pre-amp -> coax -> power splitter -> RX1
                                              -> RX2

73 Jan PE0SAT

With regards PE0SAT
Internet web-page http://www.pe0sat.vgnet.nl/
DK3WN SatBlog http://www.dk3wn.info/p/
Online Telemetry Forwarder: http://tlm.pe0sat.nl/
irc://chat.freenode.net #Cubesat - Twitter @pe0sat

On 11-01-2017 02:11, Scott wrote:
> Hi everyone.
> I suppose that any deviation from the ideal setup of a near-perfectly
> matched antenna & receiver will have SOME negative effect, but for a
> receive-only antenna, how badly am I hurting myself to split the
> antenna between two receivers?
> Since frequency is probably important to answer this, I’m referring to 
> 70cm.
> Also, if it matters, I have a very good preamp (SP-70 from SSB) at the
> antenna feeding 25 meters of LMR-400.  Both receivers are SDR devices
> (receive-only).
> When I tested against a 70cm beacon, there was some small reduction in
> signal strength but it wasn’t much.  With voice, you might not notice
> but my interest is telemetry data.
> Thanks for any recommendations or experiences with a similar arrangement!
> -Scott,  K4KDR
> Montpelier, VA  USA
> twitter:  @scott23192 

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