Low power UHF transmitter continuous transmit

[tampabaynews]

I am working on a new project and I am kind of stuck. I am seeking to transmit audio through a low powered transmitter and monitor on my portable. I have found several devices but they don't work for my required frequency range and are likely not FCC approved.

Band: 467-469MHz. Yes I am licensed on several UHF frequencies.

Channel options: 1 channel with CTCSS capability, both user programmable

Output power: 500mW - 1W, just need line of sight for several hundred feet

Audio: Any standard audio connector such as 3.5mm or XLR

Cycle: Continuous transmit from several minutes to a couple hours at a time

Power: Tapped to an external battery, fused

Any ideas would be appreciated.

 

[ecps92]

Why not got for a VHF Wireless Mic ?
Little more Distance, won't need CTCSS

Not sure, what is out there for UHF as the only Mic users in the 457/467 are the fast food joints

I am working on a new project and I am kind of stuck. I am seeking to transmit audio through a low powered transmitter and monitor on my portable. I have found several devices but they don't work for my required frequency range and are likely not FCC approved.

Band: 467-469MHz. Yes I am licensed on several UHF frequencies.

Channel options: 1 channel with CTCSS capability, both user programmable

Output power: 500mW - 1W, just need line of sight for several hundred feet

Audio: Any standard audio connector such as 3.5mm or XLR

Cycle: Continuous transmit from several minutes to a couple hours at a time

Power: Tapped to an external battery, fused

Any ideas would be appreciated.

 

[SCPD]

What about a part 15 fm transmitter like one of the ramsey kits. You can get several hundred feet from just 10mw. Tune it to an even slot like 88.2, 88.4 etc.

Or

A simple baby monitor operating in the 49mhz band.

I'm not sure if either is legal for this purpose.

I am very sure you can't do this legally on uhf .

 

[SCPD]

One more thought try guitar center . I've seen them offer wireless mic devices that use uhf freqs but they are wideband and won't work on a narrowband ht. And they are pricey.

 

[KC8ESL]

If you're going that route, I would suggest an in-ear monitor system. You could run 2 channels of audio at the same time over 1 rf carrier, saving you from having to do it again if it works well.

Sennheiser EW300 g3 series are great performers.

 

[tampabaynews]

Thanks for the suggestions.

I carry a UHF radio for work and licensed on several frequencies between 467-469MHz. So the device would need to be able to work on a frequency of my choice in that band.

Speaking from my broadcast experience, IFB systems and wireless mics generally are 500-600MHz. Won't work in my radio obviously. I don't want to carry any more gear than I have to if I can avoid it.

This is similar to what I'm looking for Wireless Intercom / Base Station Radio - Riton Inc.

The only question I will have to find out is the duty cycle. Just wanted to see if there were any similar devices on the market.

 

[KC8ESL]

That's why I specifically suggested the Sennheiser unit. Coverage from 470 - 638MHz, depending on the band you purchase. Your scanner should tune to 512MHz.

 

[mancow]

Check this out!

https://www.tindie.com/products/NiceRF/2pcslot-embedded-walkie-talkie-module-sa818-with-rda1846s-chip-vhf-version134174mhz/

Entire unit

https://www.tindie.com/products/NiceRF/all-in-one-walkie-talkie-module-sa828-/

 

[ecps92]

Consumer (average Joe) Wireless is generally VHF 160-170
There might be some rare UHF, but most are all listed as 500-600 , not 457/467

Commercial Grade, yes is UHF-T, however is being forced to Vacate the 698-806 band
for the 470-512

Thanks for the suggestions.

I carry a UHF radio for work and licensed on several frequencies between 467-469MHz. So the device would need to be able to work on a frequency of my choice in that band.

Speaking from my broadcast experience, IFB systems and wireless mics generally are 500-600MHz. Won't work in my radio obviously. I don't want to carry any more gear than I have to if I can avoid it.

This is similar to what I'm looking for Wireless Intercom / Base Station Radio - Riton Inc.

The only question I will have to find out is the duty cycle. Just wanted to see if there were any similar devices on the market.

 

[ramal121]

If you stumbled onto Ritron, might want to check out their DTX module. Claim 100% duty cycle if you get the optional fan for it.

http://www.ritron.com/pdf/dtxpl.pdf

 

[KC8ESL]

Ecps by commercial you mean wireless mics and such?

I can speak with authority on that subject and say we were forced from 698-894 about 4 years ago. All wireless mics, IEM units, and intercom systems for entertainment (in the USA) now operate in the 470 - 698 MHz region.

Gone are the days of placing wireless mics inside NTSC video signals where no carrier is present. With DTV, it's now a solid 6 MHz chunk of noise. Coordinating over 11 wireless microphone channels in major metropolitan areas is becoming tough. Some of the tours I support are carrying over 60 channels of RF and they don't have the benefit of being inside an arena, they're in a stadium. Our RF techs sure earn their keep on those tours!

 

[ecps92]

Commercial Grade aka Industry use vs the day-to-day (Consumer) Church or home type use (Joe the ...)

Sadly tho with the 470-512 if you are in major city area, look out for Part 90 users (Boston, NYC, etc)

Ecps by commercial you mean wireless mics and such?

I can speak with authority on that subject and say we were forced from 698-894 about 4 years ago. All wireless mics, IEM units, and intercom systems for entertainment (in the USA) now operate in the 470 - 698 MHz region.

Gone are the days of placing wireless mics inside NTSC video signals where no carrier is present. With DTV, it's now a solid 6 MHz chunk of noise. Coordinating over 11 wireless microphone channels in major metropolitan areas is becoming tough. Some of the tours I support are carrying over 60 channels of RF and they don't have the benefit of being inside an arena, they're in a stadium. Our RF techs sure earn their keep on those tours!

 

[tampabaynews]

That's why I specifically suggested the Sennheiser unit. Coverage from 470 - 638MHz, depending on the band you purchase. Your scanner should tune to 512MHz.

I will not be using a scanner, though. I have commercial radios with a 400–470MHz band split. Precisely why I am seeking a device that will allow me to transmit on my licensed frequencies in the 467-469MHz range. I don't think I'll be able to replace my cache of portables with those of the 450-512Mhz band split.

 

[tampabaynews]

If you stumbled onto Ritron, might want to check out their DTX module. Claim 100% duty cycle if you get the optional fan for it.

http://www.ritron.com/pdf/dtxpl.pdf

I didn't see that one. I will look into it, thanks!

 

[tampabaynews]

Check this out!

https://www.tindie.com/products/NiceRF/2pcslot-embedded-walkie-talkie-module-sa818-with-rda1846s-chip-vhf-version134174mhz/

Entire unit

https://www.tindie.com/products/NiceRF/all-in-one-walkie-talkie-module-sa828-/

I saw something similar. Very interesting. The question is, is it FCC approved?