• Get involved.
    We want your input!
    Apply for Membership and join the conversations about everything related to broadcasting.

    After we receive your registration, a moderator will review it. After your registration is approved, you will be permitted to post.
    If you use a disposable or false email address, your registration will be rejected.

    After your membership is approved, please take a minute to tell us a little bit about yourself.
    https://www.radiodiscussions.com/forums/introduce-yourself.1088/

    Thanks in advance and have fun!
    RadioDiscussions Administrators

Analog STL Links?

C

cc333

I'm toying with using analog radio on a different frequency to beam my Part 15 signal to another transmitter wirelessly and without relying on the internet (which introduces latency). Ideally, without a license.

The MURS (Multi-Use Radio Service) seems promising, because maximum power is 2 watts, and FM is permitted. However, my research tells me that radio repeaters aren't allowed, and a MURS receiver coupled to a Part 15 transmitter, technically, is a repeater, is it not?

Are there any other (unlicensed) options?

c
 
Radio Bob said:
Could you use an office WIFI system and link them using a highly directional antenna on both ends. WIFI doesn't require a license.
Click to expand...
Technically maybe but I forgot the 800 IT number most likely 802 or 3. something but there are limits on WIFI power. A directional antenna would probably exceed that level. Also someone sooner or later will get in the pattern and mess with your signal just for spite.
 
secondchoice said:
Technically maybe but I forgot the 800 IT number most likely 802 or 3
Click to expand...
The IEEE number for WiFi is 802.11 with a letter or two at the end to denote the generation.

The earliest WiFi systems were simply 802.11. Then 802.11a and b came along, followed by 802.11g, 802.11n, 802.11ac 802.11ax and 802.11be. Recent versions of the standard has done away with the confusing and seemingly arbitrary array of letters, so 'ax' and 'be' are more commonly known as Wi-Fi 6 and Wi-Fi 7 ('n' and 'ac' were retroactively renamed Wi-Fi 4 and Wi-Fi 5, respectively).

Doing a bit of quick research just now, I don't see anything about a power limit, but I'm sure there is one.

c
 
cc333 said:
I'm toying with using analog radio on a different frequency to beam my Part 15 signal to another transmitter wirelessly and without relying on the internet (which introduces latency). Ideally, without a license.

The MURS (Multi-Use Radio Service) seems promising, because maximum power is 2 watts, and FM is permitted. However, my research tells me that radio repeaters aren't allowed, and a MURS receiver coupled to a Part 15 transmitter, technically, is a repeater, is it not?

Are there any other (unlicensed) options?

c
Click to expand...
There's always the 902-928 MHz "everything goes" band. That band is not only a ham band, but also used for ISM and Part 15. The FCC rule is 47 CFR 15.249, which also applies to consumer WiFi equipment. The allowed field strength on the 902, 2400, and 5800 MHz bands is 50 mV/m at 3 meters, or about half a milliwatt RF power output. Don't bother with the latter two bands unless you intend to do streaming via your WiFi router. Both bands are overcrowded with WiFi and will be no good for anything else.

But there are other Part 15 allocations as well. Check them out, especially 49.82-49.90 MHz that still has a "100 milliwatt input into a one meter rod antenna" rule like the old CB walkie talkies did decades ago.
 


Back
Top Bottom