Re: Lectrosonics SR Reciever - First Impressions

Hi Tom and Rob,
Early Disclaimer: I understand our side of the gear. I'm not on as
firm a ground when speaking of all the various cameras out there.
Comments welcome, of course.

As far as I know, line level on the cameras is based somewhere around
0 dBu with 20 dB of headroom, that is, before maximum level is reached
or digital FS is reached. So the line level input is really a +20 dBu
input to get to full scale. The SR maximum output is just what it says
on the screen. When displaying +5 on the LCD, the output is +5 dBu at
full modulation. Full modulation is with both transmitter red LEDs
displaying.

This is 15 dB less than the +20 dBu maximum line level of the cameras.
However, this is similar to what our other receivers have put out as
maximum level. There is no headroom in the output. It can never put
out more than +5 dBu.

If the transmitter is set up, as too many people do, with low
modulation, the output levels will be even less. For instance, if the
user sets up the transmitter so that only the first green light (-20)
comes on, in a well meaning attempt to prevent overload, the maximum
output from the receiver will never get above -15 dBm. This will be
much too low for a camera line level output. You are now down 35 dB
from the +20 line input. This is the same as for any of our receivers.
You do not need to dial in headroom in the transmitters. Let the very
good limiter protect the audio path. Get those red LEDs lit, at least
occasionally

Best Regards,
Larry Fisher
Lectrosonics

On Fri, 30 May 2008 07:34:05 -0700 (PDT), campatom@xxxxxxxx wrote:

Thank -you for your reply Larry , but still waiting for an answer
( s ) to Robs and my query concerning levels.
Cheers.
Tom

On May 29, 10:35 am, Rob <rob.b...@xxxxxxxxxx> wrote:

What was your gainstaging like? Line level output going from the 442
into the UM400, and mic level out from the SR into the camera? What
did you need to set the output at on the SR to get a comfortable
level?

When I looked at a demo model, I thought the output from the SR was
too low at line level, but I really only had about 5 minutes to look
at it, so just curious.

Rob



.

Relevant Pages

  • Re: Aaton Cantar Wired
    ... addressed in the specs on the last page. ... dBFS track level" ... in practice is -20 dBu, ... To my knowledge HD cameras are no different than standard def digital ...
    (rec.arts.movies.production.sound)
  • Re: {OT} Our supreme arsehole prez bows to all...
    ... Man up scum bag..... ... See my answer to dbu on the same topic. ... but the cameras didn't get that. ... heart or salute when the National Anthem is ...
    (alt.autos.toyota)
  • Re: Worst cycling coverage
    ... I have seen where they were broadcasting in snow/icy conditions so ... hand-held cameras aren't up to the job. ... The new hotness is probably SDI into the transmitter, ... The wireless link is the weakest link. ...
    (rec.bicycles.racing)
  • Re: UCR 201 ext power problem?
    ... want to supply the proper cables. ... VDC even 2 receivers are well below the breaking point. ... the hirose DC out is not able to power TWO Lectros ... I don't have time to test all the cameras that I happen to record to. ...
    (rec.arts.movies.production.sound)
  • Re: Wireless Video Transmitters
    ... We are only doing audio as we are not set up for cameras yet. ... Has anyone used a wireless transmitter for video? ... Would prefer a battery operated transmitter as sometimes our cameras ...
    (rec.video.production)