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Portable Inverted "L" Ant...
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900Mhz feedline and anten...
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So what happened to the M...
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GTX900 Program List
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Radial Plate Cheap and Ea...
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Copafest 2017
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10-17-2017 07:55 PM
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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 (6)

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

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  What's in your VHF/UHF Radio?
Posted by: N7FAN-David - 10-04-2017 04:01 AM - Replies (3)

Which repeaters do you have programmed into your radio memories? Maybe you hang out on a simplex frequency?

What do you have programmed?

There seem to be several thousand repeater pairs in the Phoenix area, and only a few good repeaters. So, share with us which ones you listen to.

I found an old memory list from when I lived in Chandler. Half the repeaters are no longer on the air, and most of the rest of them you can't hit from Maricopa.

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  Monday Night Net
Posted by: K7NDM-Nathan - 09-18-2017 08:06 PM - Replies (2)

I haven't herd a net in a couple weeks now. Did we change Frequencys again? Thanks Nathan

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  EchoLink up and running on 449.800
Posted by: NA7CS - Curt - 07-27-2017 05:55 PM - Replies (3)

After a little head scratching I managed to get EchoLink working on my 449.800 repeater, PL 110.9. This is open to all to use within the limits of FCC rules Smile All I ask is, if you bring up a node you disconnect it when done. I have also configured it so that 5 separate stations can connect simultaneously. Depending on how that works, I can increase the number of "Conference" connections significantly.

For those curious, the repeater is a Motorola R1225 running 25W into a 6dBd antenna. The EchoLink interface is my SignaLink USB in VOX mode that has been collecting dust.

Here is a quick intro from the EchoLink web site and useful links.

"EchoLink® software allows licensed Amateur Radio stations to communicate with one another over the Internet, using streaming-audio technology. The program allows worldwide connections to be made between stations, or from computer to station, greatly enhancing Amateur Radio's communications capabilities. There are more than 200,000 validated users worldwide — in 151 of the world's 193 nations — with about 6,000 online at any given time."

EchoLink differs from IRLP in that once a ham is registered, they can connect to any other registered repeater, link, conference or user directly in one of three ways. Hams can make connections through a local repeater or link station, using their computer and finally their smart phone. Each one can connect to the other directly.

Even though you can connect to a node using its call sign, the easiest way to connect to a node via DTMF would be with the node number. For example my node number is 885610. The best look-up tool for on-line node numbers is here. On-Line EchoLink Nodes

This is where you will find the DTMF commands. EchoLink DTMF Commands

There are some similarities with IRLP, and some differences. However I believe the many ways a station can connect to another station makes EchoLink a little more attractive.

In the coming days, the 448.525 repeater will be connected on the AllStar Link System. When done I will add a little ditty about it.

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  Grounding and Bonding Presentation
Posted by: W6SDM-Steve - 06-12-2017 05:43 PM - No Replies

At our May meeting, Andy Keels, KD4ABB, gave an in-depth presentation on grounding and bonding. Andy is a Professional Engineer with the Salt River Project.

There is so much to know about this subject. I think everyone there learned something new, regardless of how much experience they had, to begin with. Here are the slides from Andy's presentation.

[Image: Bonding%20Grounding%20NEC%20for%20HAMS-page1-L.jpg]

[Image: Bonding%20Grounding%20NEC%20for%20HAMS-page2-M.jpg]

[Image: Bonding%20Grounding%20NEC%20for%20HAMS-page3-M.jpg]

[Image: Bonding%20Grounding%20NEC%20for%20HAMS-page4-M.jpg]

[Image: Bonding%20Grounding%20NEC%20for%20HAMS-page5-M.jpg]

[Image: Bonding%20Grounding%20NEC%20for%20HAMS-page6-M.jpg]

[Image: Bonding%20Grounding%20NEC%20for%20HAMS-page7-M.jpg]

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  So you want to learn CW?
Posted by: W6SDM-Steve - 05-14-2017 12:08 PM - Replies (2)

Just about every time I operate CW at an even, or when someone comes into the shack while I am operating CW, I hear comments like, "Someday I need to learn that". Hey, there's no reason to wait for someday. It doesn't take that much to learn - really.

Remember in Kindergarten when you learned the alphabet? Then, once again, around third grade, you learned to write cursive? The concept is the same - associate a symbol with a character or a sound. That's what the guy in this video did.

Different people have used different methods. Some work better than others for different folks, but two key ingredients are necessary regardless of what you use to learn: drive and persistence.

Here's a link to the Android app for the program in the video: There are also dozens of apps for Ios.

So you may be asking why should you learn CW? Isn't it easy just to use phone or the many digital modes? Sure, you can do that and do pretty well, but you're missing out on a lot of the ham radio experience if you ignore the lower part of each band.

Years after the code requirement was removed from licensing, CW is still one of the most popular communications modes. Every major DXpedition will have a CW element. CW signals will get through when SSB gets absorbed by the noise floor. Many DX stations are available ONLY through CW. CW is the mode of choice for QRP because you don't need a computer and it will outperform phone in weak signal conditions.

Apps like these make it easy - no code practice oscillator or key required. Don't worry about how you learn because there really isn't any wrong way to learn. There are better and worse ways, and there is some methodology that will lend itself to easier copy and more proficient sending once you learn the alphabet.

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  AMSAT Presentation - 4-28-2017
Posted by: W6SDM-Steve - 05-08-2017 06:00 PM - No Replies

This is the AMSAT presentation by WD9EWK at our April Meeting. It's been converted to PDF format so that everyone can enjoy it.

Attached File(s)
.pdf  20170422-Presentation_for_CopaHams-WD9EWK (2).pdf (Size: 1.69 MB / Downloads: 7)
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  Arizona has a NEW 10M FM Repeater
Posted by: NA7CS - Curt - 04-08-2017 10:07 PM - Replies (3)

For the past 8 months or so there has been a 10M FM repeater lurking in Tucson. It was on 29.670 -0.5 PL 110.9. Well, in the coming weeks it will be moved to Mt Lemon and given a new frequency. What this means for us in Western Pinal County is, we will be in its RELIABE coverage area!

If you want to try it now, here is the information.

Input: 29.540 PL 110.0 (What the repeater listens to)
Output: 29.640 CSQ (What we listen to)

FYI, on 10M FM it is a good idea to add an input tone on the repeater. Because when the band is rocking you can access a several repeaters without a tone at the same time. This can be confusing at times.

Another fun band to play with.

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  Amateur Radio Homebrew Kit Thread
Posted by: NA7CS - Curt - 04-08-2017 11:57 AM - Replies (1)

I thought I would start a thread for anyone that is looking for homebrew kits. As you find a new source, add it to the list for all to see. I will/can edit the top post to compile a comprehensive list.

When you post a link, include the Company name, link address and a short description of what they offer. I will begin in the next post.

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