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GTX900 Program List
12-30-2017, 05:21 PM
Post: #1
GTX900 Program List
Here is a list of frequencies that have been / will be programmed into the GTX900 radios.

1 927.3375 WHITE TANKS (ARA - CALZONA Link)
2 927.4125 PINAL PEAK (ARA - Rim Link)
3 927.2125 SOUTH MTN (MOT)
4 927.0500 MT LEMMON (Future links to 6M @ 220)
5 927.6500 MARICOPA
6 927.1125 MINGUS MTN
7 927.4625 USERY-FHART
8 927.8375 PINAL-FHART
9 927.8000 SIMPLEX (High Power)
10 927.5000 SIMPLEX (Low Power)
SCANNING: Ch 1-5,9,10

This is the updated code plug I am putting in the recent radios. Let me know if you want this one instead.

1 927.3375 WHITE TANKS (ARA - CALZONA Link)
2 927.4125 PINAL PEAK (ARA - Rim Link)
3 927.2125 SOUTH MTN (MOT)
4 927.0500 MT LEMMON (Future links to 6M @ 220)
5 927.0250 White Tanks (Linked system)
6 927.4375 Chandler (MOT)
7 927.0875 Mingus Mountain
8 927.1625 Scottsdale (ARA)
9 927.8000 SIMPLEX (High Power)
10 927.5000 SIMPLEX (Low Power)
SCANNING: Ch 2-5,9,10

Curt - NA7CS, old-school Advanced Class.
If I wanted to be an appliance operator, I would be working in a kitchen.
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01-10-2018, 08:01 PM
Post: #2
RE: GTX900 Program List
Thanks again for reprogramming my MTX900!

In case anyone is interested here's a link to the tri-band Browning BR-137 mobile antenna that looks to be a possible clone of Curt's PCTEL:

https://www.ebay.com/itm/WIDEBAND-BR-137...2500600262

Seems to work well for 33cm, still waiting for a mini uhf to sma adapter to try it with 2M/70cm. This is the 9 element yagi I had at the meeting:

https://www.ebay.com/itm/YA90012-DMS-Wir...2616432146

This webpage describes making a collinear or super j-pole using 450 ohm ladder-line that I'm looking to use as a omni-directional base antenna:

https://www.tfn.net/~gfloyd7/antenna/
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01-11-2018, 12:41 AM
Post: #3
RE: GTX900 Program List
The Browning (and many others) lists dBi in its specs. This is if all things are perfect and we are all sitting holding hands singing kum-by-yah. To calculate dBd (a more accurate representation of performance) subtract 2.15 from the dBi figure. And do not take this as me knocking the antenna (it is close to the specs of my PCTEL antenna). Just trying to pass on some knowledge here. Smile

in the case of the Browning;

VHF is 0.85 dBd - Basically a Unity Gain Antenna
UHF is 3.85 dBd
900 is 3.85 dBd

The yagi linked is 12 dBi, which means it provides 9.85 dBd of real gain.

The moral of this story, manufactures will give the dBi value because it is higher than dBd. Think about it, which antenna would you buy, one listed as 0 dB (unity gain), or one listed at 2.15 dBi? I am willing to bet most new (and some old) hams would buy the 2.15 dBi antenna at a higher cost not knowing it is still a unity gain antenna.

Or in the case of the Browning, which antenna would you buy?

VHF 3 dBi vs 0.85 dBd
UHF 6 dBi vs 3.85 dBd
900 6 dBi vs 3.85 dBd

Always find out which dB value is being given when comparing antennas.

Curt - NA7CS, old-school Advanced Class.
If I wanted to be an appliance operator, I would be working in a kitchen.
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01-11-2018, 08:04 AM
Post: #4
RE: GTX900 Program List
I appreciate any information you have to impart Curt. I have much to learn about RF technology. I think I do remember a couple dBi to dBd questions from either the General or Extra test pool and something about 2.15 as the gain of a theoretical dipole.

The $14 Tram mobile antenna I've been using has only unity gain on both VHF/UHF so even a little gain is better. I have been surprised though on how well the cheap Tram has done with only 8 watts from my Baofeng HT and I've gotten to know the range of it fairly well.. It will be interesting to see if 15 watts from the Motorola and 3.85 dBd gain are a notable improvement.
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01-12-2018, 04:00 PM
Post: #5
RE: GTX900 Program List
So in trying to get a base set up here in the shack, I purchased a Laird Technologies QW8963, antenna for the truck, and for the house, and trying to use a Tram BASE GROUND PLANE KIT NMO to SO-239 CONNECTOR.

In one location of the house, I was able to hit South Mountain, and sometimes Usery... hardly any gain on this antenna, and I don't think that it's working very well on the ground plane kit that I had. This is also installed inside the attic. So I think I'm on the lookout for some other kind of higher gain antenna for inside the attic.

Anyone had thoughts on anything yet?

Chris
W7CGC - Extra/ ARRL VE
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01-12-2018, 04:17 PM
Post: #6
RE: GTX900 Program List
And then I forgot to turn the light off in the attic... so since I went back up, I changed the position again... inverted seems to work better than right side up.. and I wedged it into the rafters because I broke my wood screw Smile Now it's close to the attic access, but suddenly, I can hit more repeaters there than in my other locations... Including Rimlink... I'm noisy into it, but I did make it.. Was able to kerchunk all repeaters except White Tanks, Maricopa, and Mingus Mountain.. Still need to get signal reports tho.

Chris
W7CGC - Extra/ ARRL VE
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01-12-2018, 04:29 PM
Post: #7
RE: GTX900 Program List
Don't expect any gain from a ground plane antenna. It sounds like there is some obstruction, i.e., heater vent, water pipe, etc., that is blocking the signal. As you move the antenna around, you're finding a spot with less obstruction in a given direction. Your absolute best place for a ground plane is mounted right side up on the roof, clear of obstructions, but I realize that won't always be possible in an HOA area. You may even want to see what happens when you mount a ten-foot mast on the ground in the middle of your yard and attach the antenna to that.

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03-15-2018, 10:24 AM
Post: #8
RE: GTX900 Program List
Bump for updated code plug

Curt - NA7CS, old-school Advanced Class.
If I wanted to be an appliance operator, I would be working in a kitchen.
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03-20-2018, 01:59 PM
Post: #9
RE: GTX900 Program List
I want the new code plug Smile

Chris
W7CGC - Extra/ ARRL VE
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