Would anyone be interested in this? at DVinfo.net

Phil Reams · March 30th, 2003, 05:02 AM

I've heard and read a lot about RF affecting the steadyshot feature on the PD-150.

Would anyone be interested in seeing the results posted if I did a somewhat scientific test as to the minimum level of RF it takes to start causing a problem?

Among all of the other gadgets I own, I have a Motorola R2001A commnunications service monitor. This device has a RF signal generator, spectrum analyzer, oscilliscope, CTCSS tone generator, as well as a host of other features.

I'm still knocking around in my head a testing methodology and procedure, but it would be something like this:

The procedure would be to set up the PD-150 to simulate real-world conditions as much as possible.

Next, I would set up an antenna on a portable test-stand. The antenna would be tunable so I could test at different frequencies, as well as variable distances from the camera. Coax would be run from the antenna to the generator output on the signal generator.

I would then start recording a tape in the PD-150 while it was pointing at a test target.

While recording, I would then turn on the signal generator and start keying it at different power levels--lowest power to the highest level that causes an effect and record the results.

The resulting spreadsheet would look somthing like this:

Antenna distance - 3ft / frequency 154.000 Mhz / power level -30dbm - no effect
Antenna distance - 3ft / frequency 154.000 Mhz / power level -20dbm - no effect
Antenna distance - 3ft / frequency 154.000 Mhz / power level -10dbm - Interference noted

This would be repeated at varying antenna distances / power and frequencies.

I have a couple of friends with PD-150s, so we could average the results and create a baseline graph as to the maximum power of any kind of handie-talkie or headset communicator you could use without worrying about interference.

Sounds like a good weekend project in between gigs for me - or this simply could be the incoherent ramblings of someone who just finished a marathon editing session at 6:00 AM. *grin*

Opinions? Ideas on methodology? Let me know!

cheers,

-Phil

Mike Rehmus · March 30th, 2003, 12:14 PM

Certainly it would be of interest.

I wouldn't extend the sessions too long because I think the action can get fairly violent inside the camera and might, over the long term, cause some damage.

Perhaps you would start at a distance or low power level and bring up the power/lower the distance until you perceive a problem, then stop.

I'd like to send the results to the WEVA camera committee so they can make Sony pay attention to the problem.

March 30th, 2003, 05:02 AM	#1
Phil Reams Regular Crew Join Date: Jan 2003 Location: Clearwater, Florida Posts: 60	Would anyone be interested in this? I've heard and read a lot about RF affecting the steadyshot feature on the PD-150. Would anyone be interested in seeing the results posted if I did a somewhat scientific test as to the minimum level of RF it takes to start causing a problem? Among all of the other gadgets I own, I have a Motorola R2001A commnunications service monitor. This device has a RF signal generator, spectrum analyzer, oscilliscope, CTCSS tone generator, as well as a host of other features. I'm still knocking around in my head a testing methodology and procedure, but it would be something like this: The procedure would be to set up the PD-150 to simulate real-world conditions as much as possible. Next, I would set up an antenna on a portable test-stand. The antenna would be tunable so I could test at different frequencies, as well as variable distances from the camera. Coax would be run from the antenna to the generator output on the signal generator. I would then start recording a tape in the PD-150 while it was pointing at a test target. While recording, I would then turn on the signal generator and start keying it at different power levels--lowest power to the highest level that causes an effect and record the results. The resulting spreadsheet would look somthing like this: Antenna distance - 3ft / frequency 154.000 Mhz / power level -30dbm - no effect Antenna distance - 3ft / frequency 154.000 Mhz / power level -20dbm - no effect Antenna distance - 3ft / frequency 154.000 Mhz / power level -10dbm - Interference noted This would be repeated at varying antenna distances / power and frequencies. I have a couple of friends with PD-150s, so we could average the results and create a baseline graph as to the maximum power of any kind of handie-talkie or headset communicator you could use without worrying about interference. Sounds like a good weekend project in between gigs for me - or this simply could be the incoherent ramblings of someone who just finished a marathon editing session at 6:00 AM. grin Opinions? Ideas on methodology? Let me know! cheers, -Phil __________________ Phil Reams Timeless Studio Productions Clearwater, Florida FCC Licensed Electronics Technician (GROL) Amateur Radio - KC4UVU Life Member of the PSHA - Pinnacle Studio Haters of America

March 30th, 2003, 12:14 PM	#2
Mike Rehmus Wrangler Join Date: May 2002 Location: Vallejo, California Posts: 4,049	Certainly it would be of interest. I wouldn't extend the sessions too long because I think the action can get fairly violent inside the camera and might, over the long term, cause some damage. Perhaps you would start at a distance or low power level and bring up the power/lower the distance until you perceive a problem, then stop. I'd like to send the results to the WEVA camera committee so they can make Sony pay attention to the problem. __________________ Mike Rehmus Hey, I can see the carrot at the end of the tunnel!