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DMR, Fusion, D-Star Hotsp...
Last Post: NA7CS - Curt
12-03-2018 07:26 AM
» Replies: 0
» Views: 64
Last Post: K7NWF - Norm
10-19-2018 06:54 PM
» Replies: 2
» Views: 623
Yaesu System Fusion II
Last Post: NC6F-Tim
10-14-2018 10:12 PM
» Replies: 0
» Views: 179
146.780 PL 100
Last Post: w8rh
10-14-2018 08:07 PM
» Replies: 3
» Views: 786
KSAA FM Radio Tower Site
Last Post: W6SDM-Steve
09-20-2018 08:20 PM
» Replies: 10
» Views: 631
Commercial Radio Programm...
Last Post: NA7CS - Curt
07-08-2018 02:38 PM
» Replies: 0
» Views: 801
Been Enjoying Sporadic E
Last Post: NA7CS - Curt
07-08-2018 01:41 PM
» Replies: 1
» Views: 451
Facility Test
Last Post: N7FAN-David
05-17-2018 04:03 PM
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Field Day 2018 Venue
Last Post: N7FAN-David
05-17-2018 04:01 PM
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TS-430S + Pwr Supply For ...
Last Post: KC1BB-Jim
05-03-2018 06:27 AM
» Replies: 0
» Views: 384

  DMR, Fusion, D-Star Hotspot goes APRS?
Posted by: NA7CS - Curt - 12-03-2018 07:26 AM - No Replies

The creators of the MMDVM homebrew digital repeater controller and digital hot-spot are in the process of adding the ability to share GPS data from a Mobile GPS device connected to the hot-spot. Previously it used the coordinates of the station. But that is now being changing and tested.

Here the new config parameters included in the ini file to make this happen.

[Mobile GPS]

For more information look at the MMDVM group on

73 de NA7CS

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  Commercial Radio Programming
Posted by: NA7CS - Curt - 07-08-2018 02:38 PM - No Replies

As a lot of you know I mainly use commercial radios for FM communications. As such I have a ton of software to program said radios. So here is a list of what I have; and what I can program for licensed hams and those on GMRS, FRS and MURS. I am sure I am missing a few, but here is a pretty decent list.

IF I DO NOT KNOW YOU I WILL ASK FOR PROOF OF LICENSE FOR HAM & GMRS FRS and MURS does not need a license, but the radios should be 2W units.

TK-630, TK-730 & TK-830

Syntec II

Maxtrac & Radius Lines
DeskTrac - Base & Repeater
Spectra, High & Low Power
Astro Spectra
1225 series (P, M, R, GR)
Motorola 2K line (MCS, MTS, etc)
Astro P25 - XTS, XTL & some PM 1500, 2500, 3000 & 5000
DMR - XPR Series Mobile, HT & Repeaters. Includes the SL7550
Some of the older HT & MT walkie-talkies.
GTX Series
MTX Series
Professional Series - CDM & HT 750, 1250 & 1550. Have the ability to dynamically change the band split with this series. Within reason.

When in doubt about anything commercial, contact me or visit the following.

Repeater Builder Technical Info

Curt - NA7CS

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  Been Enjoying Sporadic E
Posted by: NC6F-Tim - 06-28-2018 11:10 PM - Replies (1)

I put together a used 10 meter three element yagi the last week of April and got it mounted on my push up mast with a vintage Alliance Tenna-Rotor model U100 the first week of May. Since then I've been able to enjoy several days with Sporadic E propagation. A couple weeks ago I took down the mast for my Tram 1480 and mounted another Alliance Tenna-Rotor (model C225) with a two element Diamond yagi for 6 meters under the 900 MHZ yagi and Tram vertical. Caught the 6M band open a couple days later and had several QSO's around the east coast. I have to say that Sporadic E is a lot of fun.

[Image: 35768484_2032242406993111_48455720316488...e=5BE1DED6]

Diamond A502HB with dual gamma match and Alliance Tenna-Rotor model C225 with a thrust bearing fabricated from a two bolt flange bearing and aluminum angle:

[Image: 34808176_2024463827770969_20512872511318...e=5BA58D63]

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  Fusion Repeater Modifications
Posted by: NA7CS - Curt - 04-30-2018 06:02 PM - No Replies

This morning Dale, KB7DD and Tim, NC6F, came out to my shack to do some necessary modifications on one of the club's Yaesu DR-1X Fusion repeaters. The modifications performed were;

  • Install a FUSE between the power supply and the TX radio.
  • Reduce the DC voltage from 13.7V to 12.8V.
  • Mount the Down East Microwave preamp inside the case.

To immediately answer the obvious question, there was absolutely no fuse between the power supply and either radio. As of today the TX radio is protected. If I had a smaller fuse we would have added protection to the RX radio. This shall be done in the future on this, and the remaining two Fusion repeaters the club owns.

Reducing the voltage will (slightly) reduce heat in the power supply and the TX radio while in transmit. Any reduction in heat is a good thing, even if it is only 5 - 10 deg F.

Tim removing the TX radio. (Note the lack of fuses in the power cord)
[Image: DSC01311_l.jpg]

The TX radio is now protected!!!
[Image: DSC01312_1.jpg]

This mod we did not have to do as the plastic piece was already removed. This allows unrestricted airflow from the fan to cool the internal components of the TX radio.
[Image: DSC01315_1.jpg]

The preamp has been installed. A more permanent mount will be used, as soon as I can find/think of one.
[Image: DSC01316_1.jpg]

Completed TX side modifications.
[Image: DSC01321_1.jpg]

Completed RX side modifications.
[Image: DSC01322_1.jpg]

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  New addition to the Hidden Valley skyline
Posted by: KC1BB-Jim - 04-02-2018 06:22 PM - Replies (1)

After years of thinking, planning, and finally executing, I finally have my tower and tri bander up.

Attached File(s) Thumbnail(s)
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  Antenna Projects
Posted by: W7CGC-Chris - 03-28-2018 09:16 AM - No Replies

So it's been awhile since I've posted on here, so I thought I'd share a little of what I've had in the works.

I finally got my WT-51 tower up a couple of months ago, after going through the whole city permit process, and HOA process for over a year.

This included digging the pit for the tower base, building the base, and pouring the concrete.

Assembling the N4ARR Hexbeam
[Image: 20180121_160709_1518622067387.jpeg]

Preparing the Tower, mast and Rotor:
[Image: 20180121_160729_1518622063799.jpeg]

Attaching the Hexbeam and connecting the coax:
[Image: FullSizeR_03.jpg]

Lifting the tower into place was a complicated task, of pounding in earth anchors into the ground, to secure the tilt pole that rests against the concrete and attaches to the tower. I unfortunately did not get pictures of this, but the earth anchors are designed for 400lbs of force each.

Once the tower was in place we noticed the tower was not raising properly, so the cable had to be rerouted, and in order to do this, tension had to be taken off the cable. Good old leverage was used to take the pressure off, and it was taking awhile to reroute the cable, so my social media addiction probably kicked in here as I was holding the lever.

[Image: 20180121_172859_1518622059105.jpeg]

[Image: 20180121_172904_1518622062596.jpeg]

It was important to be able to raise the tower slightly because it was making contact with my dual band base antenna:
[Image: IMG_20180121_172854.jpg]

[Image: IMG_20180121_172847.jpg]

Tower was finally up:
[Image: IMG_20180121_174754.jpg]

View from the front of the house:
[Image: IMG_20180130_124002.jpg]

One limitation that I had was that the hexbeam only goes down to 20M, and I had no option for 40M on the tower. So in order to install an antenna switch, and my 900Mhz Yagi antenna, the tower needed to be tilted back down, since I could not reach the feed point of the hexbeam with a ladder.

Everything seemed to be going well on the lowering of the tower, but make sure you check your straps when you do something like this. Because of the age of my straps, a strap did break, and the tower did fall a foot or two onto the frame we were using for safety in order to keep the tower off the ground and destroying the antenna. It barely survived, if the tower had fallen any further I don't think the frame would have survived, and my hexbeam also would not have survived. Fortunately the hexbeam bounced, and just some of the cords had to be reconnected:

[Image: IMG_20180318_105027.jpg]

[Image: IMG_20180318_105022.jpg]

[Image: IMG_20180318_105008.jpg]

As you may notice in the pictures, there may be a commonality in all of the antenna incidents... Hmm.

Big Grin

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  Technical Committee Meeting Notes Feb 24, 2018
Posted by: NA7CS - Curt - 03-06-2018 07:42 PM - Replies (3)

Technical Committee Meeting
February 24, 2018

1. What is on the air as of today.

a. At CACC two GE MASTR II's and the Arcom RC210 controller are on loan from Bob, W8RH. One is on 145.210, PL 162.2 (On the air); the other is on 449.125, PL 136.5 (Down but ready to go as soon as the hardline is ran).
b. At T-bird water tower one Fusion repeater on 446.300 PL 100.0.

2. What has been done as of today.

a. Tuned the 2M cans, as somehow they were knocked off frequency at CACC.
b. Tuned the 449.125 can at CACC and made it ready to go on the air.
c. Tuned the 446.300 can at T-Bird as best as possible until the proper jumpers can be ordered.
d. Preamps have been installed on the repeaters at CACC, and ordered for T-Bird.
e. Two - 260 ft spools of 1/2” hardline and Type-N connectors have been ordered for CACC to run from the tower to the repeater room.

3. What needs to be done.

a. Pull two runs of hardline at CACC for the 2M and 440 repeaters. ASAP! Once done put the 440 repeater on the air.
b. Order the correct jumpers for the T-Bird duplexer.
c. Modify the Fusion repeaters for cooler operation and circuitry protection.
d. Add the preamp inside the case of the Fusion at T-Bird.

4. What can/will be done?

a. CACC will be removing their microwave equipment from the tower and repeater room in the coming weeks. They will (hopefully) leave the two extra runs of LMR400, the extra rack and maybe the UPS. The extra rack and UPS will remain the property of CACC and will not leave the room.
b. There is a strong WiFi signal in the repeater room that we can use via VPN to connect one, or both repeaters to VOIP networks. DMR, YSF (Fusion), P25, D-Star, EchoLink and/or IRLP. Depending on the network(s) chosen, the repeaters might not be able to be linked.
c. If no VOIP networks are to be used, do we want the repeaters at CACC permanently linked? If not what would be the appropriate schedule for automatically linking them?
d. Do we want to create a link from/to T-Bird from CACC?
e. Do we want to link other repeaters from the CACC site? i.e. Mt. Lemmon 6M, Tucson 900Mhz, etc. If so, what repeater and permanently or on demand?
f. Raise the antenna at the T-Bird site.
g. Anything else I know I missed?

5. What do we want to do?

As this affects the entire club it is open for discussion and a final decision by all club members.

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  Back on HF...almost
Posted by: N7FAN-David - 03-04-2018 11:27 AM - Replies (3)

I am now the owner of a Kenwood TS-440S. Now I need to figure out an antenna for the backyard.

I haven't built a dipole since I was 17. Ugh. I don't even remember where to start.

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  900Mhz feedline and antennas
Posted by: NA7CS - Curt - 01-19-2018 11:01 AM - Replies (5)

Part 1

Speaking only in generalities, us amateur radio types almost always try and do things as cheeply as possible. While this is just fine for HF antennas and feedline it does not always play on the upper bands. Here is an attenuation chart from for the most popular coax used by hams. Some of the values are scary!

[Image: COAX-LOSS.jpg]

A more detailed sheet for RG type coax is shown here.

[Image: RG-Atten.gif]

And here is the LMR attenuation for 900Mhz.

[Image: low-loss_chart.jpg]

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  GTX900 Program List
Posted by: NA7CS - Curt - 12-30-2017 05:21 PM - Replies (8)

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

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