Sad they were waiting for the junk man. I could not find anybody that wanted these they were the best, SA6350 modulators. Trust me these run best at 60dB. They were still in great shape after 20 years feeding 40,000 subs.

Bob-

The Blonder-Tongue ZHC-12 mentioned by kbmuri, and I would guess the Holland combiner too, is made for just the purpose you describe (and that several of us seem to be planning here as well). What I do not know is if an ordinary splitter as sold for home use will work OK as a combiner with the relatively high signal levels of these commercial modulators. You certainly got a good combination of modulators (3,6,8,10,12), since it is best to skip channels when you can. As others noted, you may be starting with enough signal to split into 16 or more outputs without adding an amplifier; ultimately, just hook it all up and see what you get. Weak signals will be snowy of course; too strong/overloaded signals will usually have herringbone or diagonal lines and maybe ghost-looking/extra sync bars in the video.

kbmuri-

The CAMS-60a ones you got seem to be called "channelized agile", which sounds like an oxymoron to me, but it might mean "agile but only settable onto exact channel numbers", which would not be a problem anyway. The AM40-450 is settable to any step you want in its entire range, so you could set it to "channel 4 and a half" or similar. If the channelized ones are truly fixed on the channels on their labels, it is probably not worth messing with changing crystals when the actual agile ones are out there cheap.

This helps a lot.

http://www.blondertongue.com/media/p...rgComplete.pdf

Sounded like an oxymoron to me too. The "Channelized Agile" versions arrived this weekend. FWIW, they're a lot more channelized than agile.

The channel 9 one can be modified, via some VERY inaccessible switches, to VHF channels 7 thru 13 and cable channels 23, 24 and 25 (174 mHz to 234 mHz). The channel 17 one can only be tuned to cable channels 14 thru 22 (120 mHz to 174 mhZ). Presumably there's a low-band one that tunes 54 to 120 mHz too (and probably some in the higher-cable bands too). My channel-9 one will be useful enough without having to switch it. The other one is for the most part useless. Both are significantly less versatile than the fully-agile versions so I probably won't want another oxymoron unit.

The straight-channel-7 one has a specific crystal installed, in an easy place to remove/replace. It came with a crystal-frequency chart for changing it to other channels, so it could be done. An advantage of this type of unit is that it uses less power (14 watts vs 20). After you rack up 8 or 12 of them, that could become significant. For our multi-vintage-TV purposes, they're completely adequate, and if they're cheaper than the fully-agile version, probably a better deal. Although I'm seeing eBay prices all over the place for all kinds, so probably a person could get an all-agile 12-channel setup, or an all-channelized 12-channel setup, for who knows what random final cost. My setup will be an interesting mix...

The 12-into-1 combiner arrived too. It's 100% passive inside (just a conglomeration of attenuators and matching transformers and cable ends). Pretty neat too.

Now to get some digital converter boxes so I can try these things out...