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Author Topic: Practical messaging on UHF/VHF?  (Read 3566 times)
WB8VLC
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Posts: 419




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« Reply #15 on: November 05, 2017, 11:16:51 AM »

A two way radio with color touch screen text messaging and moving map GPS display is not unheard of but from a realistic and more so from a monetary market  it'll never happen.

Me and another RF Engineer co-worker friend each had 2 gps enabled color touch screen mapping UHF radios in the ham bands with text messaging and FM two way radio with bluetooth headsets.

While testing the first design of the Garmin rino 750 uhf radios we changed out the stock gmrs/frs SAW filter for one for the lower end of the uhf ham band.

Unfortunately after running early very successful test around Northwest Oregon and Olathe Ks on simplex it took some local hams in Oregon who complained that the Rino modulation wasn't authorized in the ham bands so back our Rino's went to the gmrs/frs bands.

With our antiquated FCC regulatory agency and grumpy old hams unwilling to embrace new ideas such a product is a hard product to introduce.

We hams are our own worst enemy.
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WB8VLC
Member

Posts: 419




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« Reply #16 on: November 05, 2017, 11:22:21 AM »

A two way radio with color touch screen text messaging and moving map GPS display is not unheard of but from a realistic and more so from a monetary market  it'll never happen.

Me and another RF Engineer co-worker friend each had 2 gps enabled color touch screen mapping UHF radios in the ham bands with text messaging and FM two way radio with bluetooth headsets.

The radios were capable with custom SW of working auto repeater offsets but having no repeater at our use too run our test we used simplex only.

While testing the first design of the Garmin rino 750 uhf radios we changed out the stock gmrs/frs SAW filter for one for the lower end of the uhf ham band.

Unfortunately after running early very successful test around Northwest Oregon and Olathe Ks on simplex it took some local hams in Oregon who complained that the Rino modulation wasn't authorized in the ham bands so back our Rino's went to the gmrs/frs bands.

With our antiquated FCC regulatory agency and grumpy old hams unwilling to embrace new ideas such a product is a hard product to introduce.

We hams are our own worst enemy.
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KB2WIG
Member

Posts: 355




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« Reply #17 on: November 05, 2017, 01:01:43 PM »



Well, how true is it that the modulation is ' illegal ' on the frequency band you tested on?

If it's legal, why are you upset that others don't like it or are ignorant?. If it is "illegal ", why don't you and your friend  try to change  the regs.... maybe even ask here for support? It sounds like a good application.


KLC
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WB8VLC
Member

Posts: 419




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« Reply #18 on: November 05, 2017, 03:38:26 PM »

It wasn't from our concern with being illegal but more with some locals who started rumors which halted our tests, actually it turned us off to any further dealing with local Oregon VHF/UHF good old boy ham users.

Actually from cfr 47, Title 47: Telecommunication
PART 97—AMATEUR RADIO SERVICE§97.307  operation of data in the 440-450MHz band.

 Emission standards.part F (f) The following standards and limitations apply to transmissions on the frequencies specified in §97.305(c)  for uhf 70 cm which then references section §97.307(f), paragraph:6 an 8.

From 97.307 (f) paragraph 6: A RTTY, data or multiplexed emission using an unspecified digital code under the limitations listed in §97.309(b) of this part also may be transmitted. The authorized bandwidth is 100 kHz.

In our test using the 440-450 band our data format was 300 baud taking up considerably less than a typical voice channel and in fact wholly contained within a narrower 12.5 K channel.

The complainers only complained when they realized that they wouldn't have total control over our testing.

The locals didn't want the 2 new RF ENG arrivals doing any testing on their own without their co-ordination of time and locations even though we used .5 watts on a uhf simplex frequency.

All of this hurt a lot of egos in locals more than any true concern for adhering to fuzzy rules.

These were some of the same local good old boy hams who previously complained when we used P25 ON 446.025 and then 446.0125 which is not used around here, all the time they started the rumor that P25 being a public safety format was illegal on the ham bands, in the end we found out that they felt threatened by our 2 man tests and were concerned that we would distract other users from their DSTAR and Fusion systems.

In the end we stopped using VHF and UHF frequencies because of the local kilocycle know-it-all cops.

So much for paving new methods and experimenting in ham radio.

  
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« Last Edit: November 05, 2017, 03:44:21 PM by WB8VLC » Logged
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