The Winegard SP-1002 is a simple
1Ghz splitter. It can be installed inline with the feed line and phasing
harness cables. The circuitry is sealed inside a epoxy filled metal shell
which makes it watertight in any position. This is the combiner I prefer
to use because you can use shorter cables and the installation is very
neat.
The Channel Master 0538 combiner
is designed to be mounted on a mast up 1.625" using the included
u-bolt. The F-connectors and circuitry are mounted to a circuit board
which is housed in a plastic enclosure. Rubber boots are included to help
protect the F-connectors from the weather.
Labgear #6011/00 UHF
Combiner/Splitter
The Labgear 6011 combiner is also
mast mounted. The plastic housing has a mounting tab which can be attached
to a existing u-bolt or it can be fastened to the mast with the included
tie wrap. The circuitry and connectors are mounted to a circuit board
which is housed in the plastic enclosure. The enclosure has a snap on
plastic cover and rubber grommets to seal the coax cables. The connectors
are similar to those used in Blake baluns, you must strip the coax leads
and attach them directly to the circuit board clamps, no F-connectors are
needed. The grommets will only accept RG-6. You can use RG-11 if you
remove the grommet, but you must seal the housing with silicone.
Description of Test:
I tested the combiners with a pair of my new ATF-X300
antennas. Back to back tests were made at about 5 minute intervals. The
tests were repeated three times to ensure conditions did not change
between tests. I used a Spectrum Analyzer to check the waveform for each
station. See below for results and comments.
Spectrum Analyzer Waveforms:
Winegard #SP-1002
Channel Master #0538
Labgear #6011/00
Channel 31
Channel 31
Channel 31
Channel 53
Channel 53
Channel 53
Channel 65
Channel 65
Channel 65
Conclusion:
The shape of the waveforms are very similar with each combiner.
There really is no significant difference between them.
The main consideration in choosing a combiner is how it is
mounted and what type of cables you are going to use.
To use standard cables with F-connectors, use either the 1002 or
0538. If you don't have crimping tools, the 6011 might be easier to
install. The 6011 might be a better match with Blake antennas since
they use the same type of circuit board clamp connectors.
The clamp type fitting on the 6011 may provide a better long term
connection in corrosive environments since the clamp makes a tighter
connection than the slip in type connection on F-connectors.
I did not like the braid strap on the 6011, it had a V-shaped notch
that does not conform to the round cable. You are also clamping the
coax against a flat circuit board, so the soft foam insulation could
get deformed enough to create signal reflections.
The ease of cable routing with the 1002 makes it my favorite. The
epoxy sealed housing can be used in any position and does not require
mast mounting.
F-connector type coax fittings should be filled with dielectric
paste to prevent water contamination into the foam insulation as well
as to prevent corrosion on the terminals.
