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Anyone do 900 MHz?

900 MHz 33cm ham radio

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#1 RCM

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Posted 29 December 2018 - 09:58 AM

Lately I've been perusing some of the 900 MHz commercial radios for sale, and thinking Hmmm... :unsure:

Repeaterbook lists lots of 33cm repeaters, including several in my area. Maybe now's the time to make a move into a new band.

Anyone here using the band?



#2 WRAF213

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Posted 30 December 2018 - 03:39 PM

I'd be using it if the Part 15 stuff weren't.

 

XBScZWJ.png


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#3 RCM

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Posted 31 December 2018 - 09:42 PM

Wow. That's centered right where most of the repeater outputs are, too!



#4 Logan5

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Posted 03 January 2019 - 03:21 PM

yea 900 is very messy, maybe consider 222 if you got money burning your pocket.



#5 RCM

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Posted 04 January 2019 - 05:03 AM

yea 900 is very messy, maybe consider 222 if you got money burning your pocket.

I already have 222, and have had for years.

I've joined a 33cm discussion group, and buying a Kenwood TK-981 today. We'll see how it does.


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#6 Logan5

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Posted 04 January 2019 - 04:06 PM

LoL, so the answer is yes.


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#7 RCM

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Posted 04 January 2019 - 09:05 PM

So I went and got the 33cm rig today. And here's a cool kicker: the guy I bought it from also has an unlisted GMRS repeater, and gave me permission to use it! :)


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#8 RF Medic

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Posted 07 January 2019 - 06:03 PM

I've been running multiple 900mhz repeaters for years. It is a great band. Similar to 440mhz but with sharper nulls etc... The trick is finding clear input and output freqs...my machines are on odd splits because of that but since everyone is on commercial radios it doesnt matter.

Motorola GTX and MCS2000 are my preference.
KENWOOD TK-981 my other preference.

For at home base antennas comet makes a really well performing fiberglass vertical.

LMR-400 or better is damn near mandatory.

Thats my 2cents. FYI nyc based.
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#9 RCM

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Posted 08 January 2019 - 09:02 PM

The rig I just picked up is a TK-981. I have a dual band cellular Yagi that I might be able to use for mountaintopping, if I had any way to check the match. I plan to put a mobile antenna on my van, too.

33cm operation from my home would probably be an exercise in futility.



#10 apco25

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Posted 15 February 2019 - 03:33 PM

Large 900Mhz linked system via Allstar in Southern AZ.  Works flawlessly..mountain top Quantars, MTS2000, XTL5000, XTS2500 subscriber side.


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mototrbo-radios.jpg


#11 RCM

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Posted 16 February 2019 - 07:40 PM

I was in the Knoxville, TN area earlier this week and made contacts on a couple of repeaters. It worked great, and I had no problem getting a response.



#12 kb3awq

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Posted 14 September 2019 - 03:49 AM

I have had a Kenwood tk-481 and tk-981 for a couple years and only 2 others here in Williamsport, PA had and we would play around on simplex.  In May this year we were blessed with a high repeater.  Since then we are up to about 10 people.  Its getting more use than the other repeaters around.


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John

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#13 RCM

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Posted 09 November 2019 - 07:00 PM

There is a new 900 repeater fairly close to me, and I have worked it a couple of times to verify its existence. I've also been in contact with the repeater owner.

I have more 900 rigs now, too. TK-981s and a couple of TK-481 portables. Both are awesome radios that use the same programming software.

 

The TK-981 is a mobile that is the same platform (and uses the same software and cable, accessories etc.) as the TK-880 that is popular with GMRS ops. The 481 is the same platform as the TK-380.

 

Anyone who is at all interested in 900 MHz should look on ebay and possibly elsewhere; TK-981s are kinda' flooding the market right now at prices as low as $50 shipped. A year ago they were $140-$200. Next year you might not be able to find one for any price. That's how it works.  Apparently one or more sizeable entities are replacing their 900 MHz system(s) with something else.



#14 Jones

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Posted 10 November 2019 - 03:36 PM

I'd be using it if the Part 15 stuff weren't.

 

XBScZWJ.png

 

You know... In looking back at this, I am wondering if that wide mess centered at 927.5850 isn't an IF image on your monitor.  That 150KHz wide signal doesn't look like anything part 15, but it sure does resemble the pattern of an analog Stereo-Composite FM signal used to relay programming from a studio to a transmitter site for broadcasting.  STL (Studio to Transmitter Link) signals are normally 150KHz wide, and are in the 940-960MHz range... the bottom end of L-Band microwave.  If it's on 24/7 and never moves, that's likely your answer.


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#15 WRAF213

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Posted 14 November 2019 - 07:28 PM

You know... In looking back at this, I am wondering if that wide mess centered at 927.5850 isn't an IF image on your monitor.  That 150KHz wide signal doesn't look like anything part 15, but it sure does resemble the pattern of an analog Stereo-Composite FM signal used to relay programming from a studio to a transmitter site for broadcasting.  STL (Studio to Transmitter Link) signals are normally 150KHz wide, and are in the 940-960MHz range... the bottom end of L-Band microwave.  If it's on 24/7 and never moves, that's likely your answer.

 

That's just a short blip. The only analog STL is up at 947.00 MHz and doesn't come in particularly strong. There's a few FLEX pager signals bleeding in and they show up pretty weak on that spectrum display, but they're coming in around -60dBm just about 2 MHz up. All of the rest of that junk is real signal, and it's getting worse as the smart meter deployment continues.

 

Here's a current look, with interference sources labeled:

PNsm5IGl.png






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