Tinu Posted October 1, 2022 Report Share Posted October 1, 2022 Hi JWsoundgroup A freelancer of ours recently had a gig recording a panel discussion with 4 people. MCR54 with betso bowties into 833, 2x MTP40s and 2xMTP41s operating in the 650mHz range. One of the transmitters started sounding worse over time. At first, there was slight saturation when talent got loud, after an hour, the signal was all but unusable. Bodypack was mounted on pants at the back, talent wasn't sweaty and the antenna didn't touch the skin directly. MCR54 showed good reception throughout the entire ordeal. After the shoot, said freelancer replaced the mic to see if the mic was faulty. But he got the same distorty sound on the other lav as well. The next day, he let the transmitter run for an hour, but it sounded fine. Setting on the MTP41s was 2wires+bias, gain set the same for the entire shoot. So... any ideas what might be wrong here? I cut out some files from the recording.. At the beginning after 20mins: 18min.mp3 After 40 mins: 40min.mp3 After 50 mins: 51min.mp3 After 60 mins: 60min.mp3 I suspect the battery being bad and influencing the bias power on the transmitter. I'll test thoroughly, but i'm wondering if i should have the TX checked by Wisycom. I'd love to hear some veteran's opinion on this, maybe you instantly recognize the sound. Best and happy recording Martin Quote Link to comment Share on other sites More sharing options...
VASI Posted October 2, 2022 Report Share Posted October 2, 2022 There was something in the room, like induction kitchen technology where the wireless does not like it. Happened to me with a shaver machine when was on. If the transmitter and lavaliers in next day was fine, then this not the problem. Quote Link to comment Share on other sites More sharing options...
Tinu Posted October 2, 2022 Author Report Share Posted October 2, 2022 So to anyone interested - figured it out. It was the line input on my 833 which was defective.... Jeez. Picture on the left: 1k -20dB sin into channel 6 Right: into channel 5 Not cool, especially since i had the unit serviced already for the exact same occurrence on CH1. Quote Link to comment Share on other sites More sharing options...
Peter Mega Posted October 2, 2022 Report Share Posted October 2, 2022 This exact same problem happened to a friend of mine with his 833 on channel 5 IIRC. This has not occurred with my Scorpio on any input and I’ve used them all on long days. Seems to be an 833 thing after the machine warms up. Sorry to hear about your problem but at least you know what it is now. Good luck Quote Link to comment Share on other sites More sharing options...
filmsalang Posted October 3, 2022 Report Share Posted October 3, 2022 SD QC is not good, old days were fantastic, Sorry. Quote Link to comment Share on other sites More sharing options...
Tinu Posted October 3, 2022 Author Report Share Posted October 3, 2022 8 hours ago, Peter Mega said: This exact same problem happened to a friend of mine with his 833 on channel 5 IIRC. This has not occurred with my Scorpio on any input and I’ve used them all on long days. Seems to be an 833 thing after the machine warms up. Sorry to hear about your problem but at least you know what it is now. Good luck Hi Peter! Wow.. so this seems to be a recurring issue then huh? Did he get it serviced, or what happened in his situation? I wonder if the 833 just has a worse construction than the 633. Might have to downgrade if this happens one more time.. Best, Martin Quote Link to comment Share on other sites More sharing options...
VASI Posted October 3, 2022 Report Share Posted October 3, 2022 12 hours ago, Tinu said: So to anyone interested - figured it out. It was the line input on my 833 which was defective.... Jeez. Picture on the left: 1k -20dB sin into channel 6 Right: into channel 5 Not cool, especially since i had the unit serviced already for the exact same occurrence on CH1. Wow Quote Link to comment Share on other sites More sharing options...
filmsalang Posted October 3, 2022 Report Share Posted October 3, 2022 1 hour ago, VASI said: Wow 14 hours ago, Tinu said: So to anyone interested - figured it out. It was the line input on my 833 which was defective.... Jeez. Picture on the left: 1k -20dB sin into channel 6 Right: into channel 5 Not cool, especially since i had the unit serviced already for the exact same occurrence on CH1. Just wondering what SD said when you got serviced before? They mentioned anything about the issue and how they fixed? Quote Link to comment Share on other sites More sharing options...
Tinu Posted October 3, 2022 Author Report Share Posted October 3, 2022 53 minutes ago, filmsalang said: Just wondering what SD said when you got serviced before? They mentioned anything about the issue and how they fixed? I didn't get any info on this and i didn't ask, it just worked after testing input 1 thoroughly. But this time, i certainly will ask. Probably it's somekind of capacitor/resistor that was bad. Or at least that's what i suspect while being a total electronics n00b. 11 hours ago, Peter Mega said: This exact same problem happened to a friend of mine with his 833 on channel 5 IIRC. It'd be interesting what Peter's friend's experience was. Any info on this? Did they tell him what was wrong with the recorder? Quote Link to comment Share on other sites More sharing options...
Peter Mega Posted October 3, 2022 Report Share Posted October 3, 2022 So I have to apologize first of all. My bad memory! It wasn’t my friends 833 with this same problem, it was his Scorpio on one of the TA5 inputs. Same issue though, distortion after a while. He hasn’t had it fixed yet so no info regarding repair. Confirming my Scorpio does not display this problem. Sorry for the confusion. Regards Quote Link to comment Share on other sites More sharing options...
Peter Mega Posted October 5, 2022 Report Share Posted October 5, 2022 What revision firmware are you running in your 833? 8.91 caused an issue with analog inputs 5 and 6 in some 833’s. Not sure what the issue was exactly. 8.92 fixed the problem. Regards Quote Link to comment Share on other sites More sharing options...
iasonas Posted November 15, 2022 Report Share Posted November 15, 2022 I have exactly the same problem on my brand new 888, same channel input ! Unfortunately it wasn't a Firmware issue . After a communication with SD, they asked me to send the device for repair plus I have to pay for the shipping costs for a device that is being used just for a couple of months until I realize the problem. Totally unfair, unpleasant and frustrating . Still on the way for repair. And now I am relying again on my old like a dinosaur, but still trusty backup 633. Quote Link to comment Share on other sites More sharing options...
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