You will need a duplexer on each ends of the coax. Preferably these
should be identical. One at the bottom end to combine the HF and VHF
signals to one coax and then on the top end to split the HF and VHF
signals to feed each respective antenna. Do be mindful that these
units are a bit fussy regarding operating in applications where the SWR
may be high. Thus they really prefer installations where the impedance
if near 50 ohms otherwise where the SWR is low, usually less than 1.5: 1
or so. Also, physical separation of the two antennas is also desirable.
Good luck with the project. I do understand as I lived and operated
from a condo in S. FL for several years.
73
Bob, K4TAX
On 12/27/2017 10:10 AM, George Pasek wrote:
2 Radios, 2 Antennas, 1 Coax.
That pretty much says it all. I currently have a KX3 and a 2-meter rig (but
I’ll probably be outfitting the KX3 with 2m’s in the future) and I use a
HamSticks for HF or a 1/4 wave GP for 2 meters. Running another coax here is
not a option (apartment) so I have been swapping radios/antennas. Now I’m
thinking of using two HF/VHF Duplexers (or Diplexer as they are also called) to
join/split the RF. For example using two of the MFJ-4916S, one port is
1.6-56mHz and the other is 140-540mHz. Hf power output is limited to the KX3
(12w?) and VHF is currently the IC-2300H at 65w. I understand that there will
be insertion loss/isolation issues. I have never pursued using splitters on a
coax feed before and tho two simple A/B switches (manual or remote) would work
better, I’d just like to keep things simple.
From what I have been reading, the Diplexer route looks like it should work
fine given the above?
tnx
de George
WD0AKZ
dit – dit
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