IPVMU Certified | 10/29/14 08:37pm
I believe the Axis Q7436 would work. It is a blade mount, up the coax PTZ control encoder card. Street price is ~$1200 for a six port blade.
Another option might be to just run UTP to each PTZ for RS422/485 control. Most Pelco PTZs can accept either Coaxitron or Pelco 'P' and 'D' protocols. Pelco D protocol is very common in the industry and most manufacturers support it, making it a de facto standard. RS422/485 signals can travel up to 4000 feet on one pair and many PTZs can be daisy chained on a single twisted pair if the controller (VMS/encoder/DVR, etc.) is capable of addressing multiple addresses.
Converting to serial control has some other advantages. Coaxitron is noted for problems, including the pulses from the control signal occasionally interfering with the video and termination issues.
What models are the PTZs?
What about this lil guy (from Infinova)
V2414 Code converter/distributor, Manchester, high speed data line (HSDL) and RS-485 Input, 16 Up-The-Coax protocol output (compatible with Coaxitron), 120VAC/60Hz
IPVMU Certified | 10/29/14 11:11pm
there are people who still use Coaxitron for their PTZs???? I always ran a cat-5 cable to each PTZ... even if it was a Pelco Spectra.
Cheaper option the works well. About $650 http://www.bolide.topwebsites.co/accessories/DR-AD3016-16-channel-coaxial-converter.html
I have had good luck controlling the Spectra 4's or III's using the P7216 tied to a Pelco CM9760-CXTA but there is a catch, all the M and P series encoders only allow 1 channel of PTZ control per block of 4 (16 channel encoder can control 4 PTZ's). Then daisy chain encoders together with 422 full duplex to the translator. The problem you will find is the distance limitation on the translator. Unless your dealing with a casino, I can't think of any other site that will have that many ptz's within 750'. The Q7436 is a brilliant device, but you need the chasis as well. Otherwise bite the bullet and commit to running CAT 5/6 cable to run the PTZ and set the stage to go to IP down the road. Good luck!
The Axis Q7411 is a single port encoder with "Coax PTZ Control" admittably a higher pricetag for the solution than P7216 but you dont need a converter or added cabling (or the Q7920 chassis)