600 MHz is gone

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To be legit, you should buy new mics. However, if you rarely obey the speed limit, that would be some indication that you will tolerate some risk. If you use your tunable mics in the duplex gap, you will probably never get in trouble. I just wouldn't book any gigs for FCC employees.
I have a few sennheiser old ew100 g2’s that are in the 600 range. They are regulated as backup equipment. If I needed 1 in an emergency, I could use them in the gap.
 
I am aware I am bringing back a very old and dead thread to life, CLEAR!

I checked my mics, and they have range a of 610-670, in theory it could be possible to use them in that in that gap band?

I would probably be better off just buying a new system instead of trying to use my mics in a very small gap and hope there are no issues.

Check with retailers if there is still any rebate or turn-in programs going. I think I got a couple hundred bucks back when I upgraded my QLXD systems and turned in a couple units from the phased out range.

Edit: Sorry, I hadn't gone back to read the whole thread, I realize Steve mentioned the rebates early. Worth considering now if they are still available.
 
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Check with retailers if there is still any rebate or turn-in programs going. I think I got a couple hundred bucks back when I upgraded my QLXD systems and turned in a couple units from the phased out range.

Edit: Sorry, I hadn't gone back to read the whole thread, I realize Steve mentioned the rebates early. Worth considering now if they are still available.
The only one I'm aware that is still available is from AKG. The others all stopped last Fall. The AKG rebate is available until July 31, 2021.
 

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I tested them last night, and I am able to tune them in all of the open gaps.

I still think the best bet would be to get new mics moving forward.
If your present mics work in your area in that Gap band, I wouldn't rush right out an buy new mics. The 500Mhz band has already be auctioned and only 24 months remain until all the mics on that band will also be prohibited. Let the dust settle and the next generation of wireless product emerge so you don't have to repeat this process over and over.

As for using older mics in prohibited bands - be realistic. Don't show up at a convention center, stadium, theater or performing arts center with prohibited mics. These are the locations that details like that are regularly checked. If you're a DJ out in suburbia and the extent of your mic use is to announce: "the buffet is now open" then the matter of interference suddenly becomes mostly moot. If you're not a live emcee on the mic all night, then your transmitter is likely OFF during 95% of your gig (the receiver poses no issue.) This reality can buy you some time while you find the right replacement.

You can use online tools to check the available frequencies for any location at which you intend to play. You can also check to see what's allocated for any given range to know your potential for interference, i.e. public safety, or some cell phone provider. Do that, because the results can be very different in areas as little as 15 miles apart. HAVE A BACKUP PLAN because even in the gap or allowable frequency bands - the spectrum is increasingly over-crowded and it's rare today to have the only active device in that space at that location.
 
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I got to ask how would they find out you're illegal? That's like people who make copies of movies and sell them. I haven't heard one person getting fined or going to jail.
 
I got to ask how would they find out you're illegal? That's like people who make copies of movies and sell them. I haven't heard one person getting fined or going to jail.

When the fire department is tryin to respond and you come across announcing the next speaker I think they may figure it out....
 
Wireless carriers need to get their bandwidth from somewhere (for their 5G networks).

Which explains losing 600MHz.

Not to mention how much $$$ FCC made from most recent mid-band spectrum auctions ($ Billions)