I am providing 2 pictures for you that show two things.
One is the main board with the shielding plate removed and moved over to the left of the chip area, Why? To show you where it came from and what it looks like. I rotated the shielding plate in my photo so it is not in the position it would be if it was soldered in place.
Second photo shows just the shielding plate with the bottom side facing up and the tabs which are supposed to fit through the holes on the PC board.
The shielding plate solders to the mainboard where the square circuit trace is around the BH1414K IC chip in my top photo.
The BH1414K IC chip is the big black square IC chip in the top photo. The excess solder on that square trace around the chip area is where the plate was soldered to the main board.
The plate is that silver square thing in my top picture, it IS NOT IN MY PHOTO WHERE IT IS SUPPOSED TO BE. So please don't expect to find it where it is in my photo. It is simply laying there so you can see both the plate and the area it came from at the same time. Just wanted to be clear on that part!!!
If my pictures are too small click on them and they will be blown up for better clarity.
You might be able to find such a plate in other electronics and if you're lucky, you might be able to cut it down to size.
Other than that, try googling shielding plates for electronics projects. Or Board level shielding.
I can not figure out why anyone would permanently remove that plate in the first place.
If the amplifier puts out 30 watts or 50 watts, there would no doubt be issues with RF getting into the audio section of the transmitter.
Here is a link (below) in Google search posed at images of Board Level Shielding. Visiting sites attached to those images will better help you find a web site that can sell you one cut to your pre-ordered dimensions.
DO NOT order a plate with holes in it!!! That is defeating the purpose of which the plate is designed to stop in the first place. You want it to be a solid piece, ordered to the dimensions I gave you above WITH NO HOLES IN IT. That chip does not need cooling vents and putting one in with cooling vents will only allow RF to enter the protected area and you'll have issues with squeals and other RF noise.
In another post, Kage said I should have left my caps alone and do the processing outside of the transmitter.
Just to clarify I meant either leave the caps alone and instead change the resistor values if you want to keep the built in pre-emphasis by changing it to 75us, ... or jumper (or possibly remove) the capacitors to disable pre-emphasis and do the processing outside the transmitter which would be preferable.
Hmmmm? The transmitter its self sells for about $400 tops and includes the associated boards, connectors and case.
I am sending my main board back to China (minus the rest of the unit) to have the main board repaired and pre-emphasis set to 75us. I ran into problems with the caps I got not fitting in the space the original capacitors were in and I really am not capable of working on SMD/SMT parts due to loss of eyesight.
I only have to pay shipping both ways, no labor costs and removing and shipping only that board will greatly reduce shipping costs.
That would be because I am their original customer.
I believe you bought yours used.
I still can not envision why anyone would remove that plate in the first place.
Perhaps your transmitter's parts were already changed by the previous owner and who knows what they put in for parts.
Most on-line images I see of that transmitter with the cover removed, show that metal plate covering the BH1414K IC chip. I am not sure why yours was missing or why it was sold without the plate included if it was removed by previous owner.
Sometimes, before you buy anything, make sure you do all your homework about that device you plan on buying, because if anything is missing or damaged, you're stuck with it.
My transmitter was brand new when it was shipped to me, so I am the only person who has used it. It also came with a 1 year guarantee and it has since been replaced free of charge. The only problem was I neglected to have the engineer change the default pre-emphasis of 50us to 75us before the new one was shipped out.
I know what I have told you, does not help you now. But it may help you the next time you purchase something used.
Perhaps you can take a photo of your board close to the area where C3 and C4 are located and we'll see if anything has already been changed.
If you are lost, please view my other thread about 75us pre-emphasis and view the images I posted. One image shows the part numbers.
I received my board back (2 months after the fact) with pre-emphasis disabled and the metal shielding plate installed. The sound is noticeably different using pre-emphasis at the audio processing level rather than the transmitter itself. I can achieve much more loudness. I'm still not quite at commercial quality regarding sound. I'm using stereo tool and it's a shame that Breakaway Broadcast Processor doesn't work in Windows 10 as I believe this is a better out of the box product that doesn't require as much tweaking.
A word of caution shipping to China: Customs held my board for about 45 days. They have tough restrictions on what can enter the country. See the below URL. I'm lucky this board made it back to me.
The next upgrade on the list is to replace those cheap loud-ass fans. With the right modifications this has the potential to be a really great transmitter.
I received my board back (2 months after the fact) with pre-emphasis disabled and the metal shielding plate installed. The sound is noticeably different using pre-emphasis at the audio processing level rather than the transmitter itself. I can achieve much more loudness. I'm still not quite at commercial quality regarding sound. I'm using stereo tool and it's a shame that Breakaway Broadcast Processor doesn't work in Windows 10 as I believe this is a better out of the box product that doesn't require as much tweaking.
A word of caution shipping to China: Customs held my board for about 45 days. They have tough restrictions on what can enter the country. See the below URL. I'm lucky this board made it back to me.
The next upgrade on the list is to replace those cheap loud-ass fans. With the right modifications this has the potential to be a really great transmitter.
Agree on the NOISY fans!!! Makes it REALLY hard to run live mic (I'd LOVE to remote the transmitter....but space REQUIRES it to be about 3 feet from the board!!) I, like many others, am bothered with audio over-drive issues with the CZE-T501.....I can only push my Yamaha board to about 50% level before severe distortion occurs..even with the LINE LEVEL in the transmitter set at "1".. I've ordered a pair of Harrison Labs 6db RCA line attenuators....for $20 I figure it's worth a shot!!
Agree on the NOISY fans!!! Makes it REALLY hard to run live mic (I'd LOVE to remote the transmitter....but space REQUIRES it to be about 3 feet from the board!!) I, like many others, am bothered with audio over-drive issues with the CZE-T501.....I can only push my Yamaha board to about 50% level before severe distortion occurs..even with the LINE LEVEL in the transmitter set at "1".. I've ordered a pair of Harrison Labs 6db RCA line attenuators....for $20 I figure it's worth a shot!!
I agree, I'm not sure why a so-called professional transmitter is set up this way. The input has to be turned WAY down otherwise you have severe over modulation. I too run the transmitter on volume level 1. It adds a lot of guess-work, which I don't like. I believe the input should be standardized to how other electronics are set up.
FYI, BBP 0.9.0.95 works in Windows 10 and I was able to find a hack for it.
Once I get the Harrison Labs attenuators and have them installed I'll post back with results (hopefully POSITIVE!!)... Good ol' USPS!!! They sent my package 50 miles NORTH of me --- it now has to return to the sort/distro station 50 miles SOUTH of me..then sent BACK to my (the CORRECT!!) local PO. Probably arrive Monday.....we'll see.....!!
Once I get the Harrison Labs attenuators and have them installed I'll post back with results (hopefully POSITIVE!!)... Good ol' USPS!!! They sent my package 50 miles NORTH of me --- it now has to return to the sort/distro station 50 miles SOUTH of me..then sent BACK to my (the CORRECT!!) local PO. Probably arrive Monday.....we'll see.....!!
Do you think the overdrive is causing distortion even if you turn your input down to compensate? It seems like this transmitter just isn't as loud as it should be. I'm not sure how good processing is with reference levels turned way down like that.
I look forward to your results. I may do the same thing with the attenuators.