Seinheisser series 100 / 300 receivers

[simonwest]

Hello

 

Quick search, not found anything.

 

sennheiser g2 series 100 / 300 receivers. I've not been using these too often, although they do crop up from time to time (primarily a Shure UHF-R user). I noticed a tendency for some receivers to generate white noise once the Microphone or instrument transmitter is switched off.

 

The receiver scans for the pilot tone and does not indicate an incoming signal. However, the output of these receivers seem to generate white noise.

 

I was first thinking that it could be interference, other transmitters crossing onto same frequencies, digital TV issues..but the receivers did not indicate a received signal.This particular issue puzzled myself and Rob Beech on a gig not too long ago, when an acoustic guitarist all of a sudden seem to generate 100dB of white noise when he turned his pack off (100series).

 

I'd noticed this before on another set of receivers, different supplier but 300series. This was at a major UK festival, and was rather unexpected / interesting to see so many people in a comedy tent jump.

 

Tried changing frequencies, relocating receivers etc... but fault continued.

 

I would like to express that I've not done a complete test, i.e. same unit different location for ever receiver I've encoured, though the Mic incident did occur at different venues aswell with the kit from the same supplier. Cannot comment on the guitarist incident. I have had these models before and worked perfectly whilst being turned off, the unit simply recognised a turned off pack and kept as quiet as a mouse.

 

I am just wondering with anybody else had experienced this white noise fever from sennheiser g2 series 100/300's? The white noise disapears when packs are turned back on.

 

Many thanks

Simon :blink:

[boswell]

Read the manual on how to adjust the squelch !

Not got one handy and can't remember :blink:

[Swizzuk]

I'd be interested if this is a slight flaw in their design or if, as 'Boswell' states its just a squelch setting.

I'm looking at purchasing a 100 series reciever and would like to know if this is a frequent occurance.

I'm guessing it only happens when the transmitter unit is turned off as opposed to muted?

[cineko]

Simon, we use the older sennheiser ev300 and the white noise IS due to squelch not being set high enough. It happens when there are other signals around but for some reason only happens when a transmitter is turned OFF even if it was silent before being switched on.

We have setup and turned on receiver etc with no noise only to have noise break-in when the transmitter is turned off. Slight increase in squelch meant it never happened again. It was always when turning the beltpack OFF.

Presumably because once the squelch threshold has been overcome by the (correct) transmission it can be kept 'open' by noise if not set high enough.

[simonwest]

I should have mentioned in the orginal post that we did adjust squelch and it still occured (on the 100series), but this was only on one particular unit that I adjusted so I can't comment on a fair test for the 300's or other 100's in manufacture, we simply just told the presenter to mute it rather than turn it off and on, which works fine to answer that question,

 

I'll double check all the ones I have in future.

 

 

The Sennheissers just to reassure the people who are thinking of buying one, in my opinion is a good sounding and practical system...there is much more headroom in my opinion (without getting the testing equipment out) than alot of other brands out there.

 

If anyone else has noticed this despite having a high squelch setting, please feel free to share, thanks for all the post so far

 

Simon

[aidso]

Hum RF wounderful stuff.

 

Try turning the pilot tone OFF. I have had this before when using a few off the sennheiser ones. Once I turned to tone off it worked great.

 

Forgot to say. You dont have it near any PCs or CD\DVD players do you?

[Shez]

A more general observation on this... Whenever I'm working with radio mics, I never EVER under ANY circumstances allow the person using the mic to switch it on or off. It always leads to problems of people forgetting to turn it back on again or not being able to turn it back on again etc. I've seen it happen time and time again at events that I've not been working at and I cringe every time.

 

I realise that sometimes systems have to run without someone on the desk but for me that's never an option - leaving presenters or whoever to look after themselves always leads to trouble.

[simonwest]

Its not near PC's/DVD players etc, the shouldn't make a difference anyway

 

Shez, generally your right, sometimes however the presenter / user sometimes likes to be able to do this by request, i.e. so they can keep the mic on them whilst back stage etc. Hence, with trusted clients, this occurs. They are shown the mute switch, some just turn it off.

 

thanks for the posts

 

Simon