[SJDXA] Receive Antenna Question

[Bob Beyer]

The simplest way would be to use a passive "hybrid" splitter.  The same kind
of device you use for cable TV or a TV antenna.

However, most of these are optimized for frequencies from 5 MHz to 1 GHz.
You also get some loss by splitting the signal.

 

Theoretical loss:

1 in x 2 out = 3 dB per port

1 in x 3 out = 4.5 dB per port

1 in x 4 out = 6 dB per port

 

There is generally an additional 0.5 to 1 dB of insertion loss per port.

The ones made for TV are optimized for 75 ohm systems.  Depending on your
RCV antenna, you might want one designed for 50 ohms.

One way to overcome the loss would be to add a preamp on the input of the
splitter.

 

I have used better quality 1x2 TV splitters marked as 5 MHz and up to split
beverage antennas with no problems (although there may be loss that I'm
oblivious to).

 

There is a Mini Circuits brand model  ZFSC-4-1+  50 ohm unit with BNC
connectors listed on eBay right now for $50.

1 in x 4 out

50 ohms

1 to 1,000 MHz

0.6 dB per port insertion loss (in addition to the 6 dB per port splitter
loss).

https://www.ebay.com/p/1923833274

 

Mouser has the datasheet here:

https://www.mouser.com/datasheet/3/3705/1/ZFSC_4_1_.pdf

 

You'd still need to supply your own pre amp, or accept or deal with the
signal loss some other way such as using the pre amp in the radio.

 

If I finish lunch tomorrow and this thing is still listed, I'll probably buy
it.

 

Bob KE2D

 

 

From: sjdxa-bounces at mailman.qth.net [mailto:sjdxa-bounces at mailman.qth.net]
On Behalf Of Steve Molo KI4KWR
Sent: Tuesday, December 30, 2025 6:37 PM
To: 'Jersey DX Association South'
Subject: [SJDXA] Receive Antenna Question

 

Is it possible to use one receive antenna for four radios?

K3 / DX3000 / IC-7610 and Flex 6400 all have a RCV ANT port but can I use
one antenna like West Creek without a secret setup?

 

Steve Molo KI4KWR
Madison, AL 35758
Email:  <mailto:KI4KWR at gmail.com> KI4KWR at gmail.com
Phone: 609-489-1878

 

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