Jump to content

Video Transmitter Hell, RF guru required!!


jason porter

Recommended Posts

Hi folks,

Here's the problem.

I am sending audio to 2 X F900R's (via RF links) and the camera's are

sending wireless video signals (1 on each cam) to the director.  I am

not sure what brand the video Tx's are, but they aren't Modulus,

Canatrans or any other big name I've ever seen.  These little buggers

are adding low-level "hash" to the audio (at the best of times) and

big noisy intermod at the worst of times.  They are frequency agile

(anywhere from Ch 14 to Ch 69) but they seem to cause me problems no

matter where they are set (my on-camera Rx's are in the 525-550 mhz

range, TV 23-27-ish)

The possible clue to my solution is this...the units have 4 different

antennae (each for a different freq range, but a WIDE range) for

example, the video Tx is on CH 69, the antenna has a range of Ch 45-

69 (as it is labeled)  Would it help if I used a whip antenna that is

finely tuned to Ch 69?.(like the ones from Remote Audio that I can cut

myself)  OR  could I put some sort of inline attenuator between the Tx

and the antenna to weaken the output?

Any thoughts?

Thanks

-Jason

BTW, the International Video Rental House here in Toronto has been no

help at all.

Link to comment
Share on other sites

  • 2 weeks later...

What brand/model are your camera RX's? Where are the video TXs mounted relative to your RXs? What distance are you operating from? What are the RF spectrum scans showing? I assume you have tried a number of freqs to rule out intermod problems. You said you don't know what brand/model of video TXs they are using ... might be good to know. Then you can look into known issues (if any).

Link to comment
Share on other sites

The F900 emits a tremendous amount of RF even without the transmitters.  If it is determined to be the transmitters, a little tent made out of black wrap around the transmitter's antenna has worked for me in the past.  And keep it as far away from your receivers as possible, of course.  Good luck.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...