Looking for a VHF Band III Hyperband to UHF Group B combiner

pathogan2008

I'm looking for a VHF Band III Hyperband to UHF Group B combiner
Preferably one with F-Connectors and low loss (<1dB). Good isolation between VHF and UHF.
It does not need to be in an outdoor enclosure. Power pass through is also not required.
Most existing VHF-UHF Diplexers only go to ~250MHz on the VHF. I need a VHF hyperband version.

Does anyone know if such a product exists or where I could get one?
Thanks in advance.
PH

Antenna

THe low cost Televes 4048 diplexer will do that just fine (see pics)

http://www.tvaerials.com/admin/downloads/4045-4047.pdf

Input 1 (left side) specifies UHF channels 21 to 34 but it will also accept lower than channel 21 i.e. hyperband, VHF Band 3

Input 2 (right side) accepts 37-69 (UHF groups B and C/D)


If the output coax is being fed with DC current (to a masthead amplifier) up to one of the inputs, make sure to break off the 'DC pass' link on the other input (the two links are clearly visible on my attached picture). Otherwise (depending on the aerial) you could cause a short circuit on the DC up.

pathogan2008

Thanks for this Antenna. Great information.

As long as the UHF1 input on this Televes 4048 can accept VHF from 200-400MHz it should work fine in my application. Is the website you linked to the best place to buy these?

This particular unit is saddle and clamp. Do you know if there is an alternative with F Connectors?

I found this combiner also, http://www.qintar.com/html/tv/mmds.htm

but I think the Televes might be a cheaper and easier to find option. Any others that might work?

PH

Antenna

Triax have ones with F connectors and quote slightly better specs.

look at this page 3 of this:
http://www.triax.co.uk/upload/masthead_09.pdf

part numbers 370684 or 370685 would suit you

I do not know who your local supplier would be for Triax.
Televes is more likely to be stocked by local electrical wholesalers, that's why I linked to that page.

the combiner you linked to has high insertion loss, forget it. either of the above will perform better

pathogan2008

Hi Antenna.
Thanks again for the help with this. The Triax 370685 looks like a good fit to combine super & hyper band VHF with Group B-D UHF.
The fewer dBs I loose on this, the better.
If I wanted to add an extra layer of complexity to this, and also combine a satellite signal along with the two mentioned above, is there a "1-box" triplexer solution that you could suggest?
The problem that I've encountered with the triplexers and quadruplexers I've looked at (Triax 370687, Labgear PSF410 etc) is that they cutoff the VHF around 230 MHz. Out of band isolation will kill 300MHz signals.
If such a triplexer does not exist, then I suppose I could use a "2-box solution" i.e. First combine VHF and UHF, then feed the resultant signal to the input of something like a Triax TMC SAT69 or Triax 340110 combiner or Antiference UDF200DC.
Your thoughts or suggestions please?

PH

pathogan2008

Anyone else have an input on this?
Looks like I will go with a two-stage solution.

Thanks.
PH