AmateurRadio.com

Stations worked on 70cm tonight with 5W and a 2m big-wheel omni

This evening was the September 70cm leg of the RSGB’s UKAC contest, so I decided to give it a go with my 2m big-wheel and 5W SSB. The match on 70cms was very good, but I had no idea how it would actually work. Well, the answer is “very well” as you can see by the stations worked. Best DX was 182km. To say I was pleased is an under-statement!  I shall be able to use this antenna again in 70cm contests. I was also able to copy the new beacon NW of Leicester GB3LEU which was pretty good copy on 432.490MHz.

Roger Lapthorn, G3XBM, is a regular contributor to AmateurRadio.com and writes from Cambridge, England.

Yesterday I completed the construction of the crystal-controlled tone generator which will be used to modulate my lightwave transmitter during future clear-air / cloudbounce tests.




It was installed on the lightbox, right beside the original 556 CW beacon / tone generator.




The crystal-controlled oscillator uses a CD4060 IC as an oscillator-divider and produces a ~550Hz or a ~1098Hz squarewave from the 4.5MHz crystal.

4500KHz xtal divided by 8192 showing 549Hz output

The original 556 tone generator will be kept for aural CW and beacon modes as it provides a stable enough signal for this purpose but for the very narrow bandwidths that I plan to use when digging into the noise with Argo, I reasoned that the signal needed to be more stable.

As can be seen by comparing the two oscillators (crystal on the left and 556 on the right), the 556 has a lot of drift (although it looks like it might eventually stabilize) and, as well, produces several spurious signals ... probably robbing power from the main tone. The crystal-controlled signal is rock solid and doesn't appear to generate any parasitic signals in the process. The trace below the crystal signal is unrelated to the oscillator.




When I first wired the unit up, I found an unstable low frequency oscillation from the 4060 during key-up conditions, due no doubt, to the lengthy leads inside the box. This was cured by adding a pull-up resistor to the keying line as shown in the final schematic below.












Now it's on to building another fresnel-lens receiver box which will be needed for any field work here on the island.
Steve McDonald, VE7SL, is a regular contributor to AmateurRadio.com and writes from British Columbia, Canada. Contact him at [email protected].

This blog started in conjunction with my return to the United States in 2005 and purchase of a Toyota Tundra. After being away from the US for four years, I celebrated my return by the purchase of the new truck and a (mostly) circumnavigation of the lower 48. My first encounter with Toyota was through my friend Robb and a 1980s Toyota 4×4 he had. Robb was going to school at Cal Poly, San Luis Obispo. Robb was fond of taking his truck to Pismo Beach and enjoying the beach and dune experience. Robb loved his truck.

After spending a year in Monterrey, CA learning Russian at the Defense Language Institute and a few months honing my listening abilities at Goodfellow Air Force Base near San Angelo, TX, I got my follow on orders to Fairbanks, Alaska (Fort Wainwright). I didn’t have a car. I was an enlisted Army soldier making not a whole lot of money. Heading way, way up north. I figured I needed a 4-wheel drive vehicle to make my life a bit more comfortable. My first thought was a Ford Ranger. But it ended up being too expensive. The most reasonable costing 4-wheel drive vehicle was a Toyota 4×4. It was 1993 and the Tacoma had not come along yet. 1993 Toyota 4×4. Manual locking hubs. Manual windows. AM/FM radio. Bench seat. No A/C. 4 cylinders. That truck was to go on to perform flawlessly in Alaska, transported me from Alaska to Georgia and several cross-country trips. Arizona. Washington State. Texas. And California. For seven years, that truck never let me down. I was heading off to Korea for a year to be followed by three in Germany. I sold the truck.

When I was planning my return to the US, I knew I wanted to get another Toyota. I settled on the Tundra. But instead of the minimum package, I was able to swing a 2005 Toyota Tundra Limited Double Cab 4×4. This truck offered to support a newly forming family. I broke the truck in with a trip around the US. I continually upgraded my ham radio installation in the truck, further enhancing my mobile enjoyment. The Tundra performed flawlessly. Never an issue.

The Tundra proved to be the hero of the 2015 Summer trip. Five national parks. From Kansas to Montana, Wyoming, out to California and back. Pulling a travel trailer. No issues, no problems. Over 120,000 miles.

It was time to think about the future. A future of summer travel. Exploration of national parks in the west. Colorado. Arizona. Utah. Maybe an upgrade to the travel trailer. The 2005 Tundra had an older drive train and a towing capacity topping out at 4,200 lbs. Comparing the aging 2005 Tundra to the current available 4x4s… the 2005 had a hard time measuring up.

I wanted to find something that was as reliable and dependable. Offered increase towing capability. But maybe smaller? Truth be told, I often had difficulty parking the Tundra. The turning radius was… challenging. Was there something available in a smaller package, yet offering increased performance and towing capabilities? Oh… did I mention that it has to be a Toyota?

Scott Hedberg, NØZB, is a regular contributor to AmateurRadio.com and writes from Kansas, USA. Contact him at [email protected].

I spent a couple of hours again this weekend playing with the N1MM contest logging software and getting back into the contesting groove. My new K1EL USB interface continues to work flawlessly, even on my ancient XP laptop ... gone are the occasional keying stutters produced when previously keying from the serial port. N1MM is one of the most widely-used contest loggers and is freely available for download here. I still run the older 'Classic' version as I don't think my laptop could handle the newer 'N1MM +' edition ... I'll upgrade when I get a newer contesting laptop.

Both the Colorado and the Tennessee State QSO Parties were held this weekend, providing me another round of CW contest practice. Both activities are pretty low-key affairs when it comes to contesting but hey, every bit of practice helps.

I found surprisingly little action in the CO Party, making just 18 contacts ... 12 on 20m CW and 6 on 40m, with 17 sections worked. There seemed to be more activity from TN amateurs though, with 38 QSO's in 33 sections, 28 on 20m and 10 on 40m. All contacts were made on CW. All of the 40m contacts were made several hours before local sunset here, surprising the heck out of me that the W4's could even hear me in broad daylight ... the stations worked must have very quiet locations.

The state QSO parties are a good way to enjoy a short round of contesting without blowing an entire weekend, which I don't think I would really like to endure, and there seems to be at least one or two of them each weekend ... an easy way to ease into contesting or to keep up your on-the-fly contest keyboarding skills.
Steve McDonald, VE7SL, is a regular contributor to AmateurRadio.com and writes from British Columbia, Canada. Contact him at [email protected].

Already a week into September and not long now till the National Hamfest where I and the South Kesteven ARS are launching a high altitude balloon launch subject to CAA approval. The documents have been submitted so just waiting for the nod.

The balloon and parachute have been purchased from Steve Randall (G8KHW) at Random Engineering, using the same size as I did for the Eggsplorer-1

I had joked about sending some "Ham into space" on this flight but following the smelly end to Eggsplorer-1 have opted to play it safe and avoid food! Instead will be sending up a toy pig (well a small squeaky dog toy)


Similar to the Eggsplorer-1 the main tracker will be a Raspberry Pi fitted with a camera and two transmitters.

The tracker is based on the "Pi In The Sky" code base/design by Dave Akerman (M0RPI) and Anthony Stirk (M0UPU) with some modifications since I am building on simple strip board using a different GPS module/interface and omitting any power supply monitoring.

On the Eggsplorer I used an old Pi Model B but was forced to butcher it to reduce the power demand by desoldering the network/usb chip. This time I am using a Model A+ which is smaller/lighter and has a much reduced power demand and with the locking micro-SD card socket will hopefully prevent a repeat of Eggsplorer-1's failure mode.

PINKY & PERKY are progressing well, just waiting delivery of some strip board and they should be completed in the next day or so.

PINKY will be 300-Baud RTTY, sending telemetry along with SSDV image packets using the UKHAS format.

PERKY will be using one of the LoRa modules again sending telemetry and SSDV but with greater resolution and speed, but will require a LoRa receiver/gateway (see Dave Akerman's website).

While the SSDV is attractive to tracker enthusiasts the high speed RTTY is more difficult to receive, so I will be flying a secondary 'backup' tracker. The use of a backup proved invaluable on the Eggsplorer when the main tracker failed.

PIGLET will be a 50-baud RTTY transmission with telemetry and should prove easier to receive.

I finished PIGLET at the weekend


Again built on strip board it is based around the ATMEL ATMega128 micro-controller using the Arduino system with a number of off the shelf modules connected to it.

It has one of the GY-GPS6MV2 GPS modules I blogged about last year feeding into the UART. The NTX-2B transmitter (frequency agile version from Hab Supplies) and a I2C BMP180 pressure/sensor module (not visible as mounted to measure external conditions) It also has a small boost converter to supply 5V and extract all the available power it can from the 3-AA lithium battery pack.

One change compared to the EGG1 tracker is to use a PWM output from the Arduino to generate the RTTY tones rather than a register voltage divider (guide here) which seems to give a cleaner signal.

The antenna is simply copper wire making a 1/4 wave ground plane. The 'box' are some layers of styrofoam glued together with UHU-Por with duct tape, some straws and beads for safety. Just needs the batteries fitting and the lid fixing with more duct tape and PIGLET is ready to fly.



Full details of frequencies will be posted nearer the time.
Andrew Garratt, MØNRD, is a regular contributor to AmateurRadio.com and writes from East Midlands, England. Contact him at [email protected].

Already a week into September and not long now till the National Hamfest where I and the South Kesteven ARS are launching a high altitude balloon launch subject to CAA approval. The documents have been submitted so just waiting for the nod.

The balloon and parachute have been purchased from Steve Randall (G8KHW) at Random Engineering, using the same size as I did for the Eggsplorer-1

I had joked about sending some "Ham into space" on this flight but following the smelly end to Eggsplorer-1 have opted to play it safe and avoid food! Instead will be sending up a toy pig (well a small squeaky dog toy)


Similar to the Eggsplorer-1 the main tracker will be a Raspberry Pi fitted with a camera and two transmitters.

The tracker is based on the "Pi In The Sky" code base/design by Dave Akerman (M0RPI) and Anthony Stirk (M0UPU) with some modifications since I am building on simple strip board using a different GPS module/interface and omitting any power supply monitoring.

On the Eggsplorer I used an old Pi Model B but was forced to butcher it to reduce the power demand by desoldering the network/usb chip. This time I am using a Model A+ which is smaller/lighter and has a much reduced power demand and with the locking micro-SD card socket will hopefully prevent a repeat of Eggsplorer-1's failure mode.

PINKY & PERKY are progressing well, just waiting delivery of some strip board and they should be completed in the next day or so.

PINKY will be 300-Baud RTTY, sending telemetry along with SSDV image packets using the UKHAS format.

PERKY will be using one of the LoRa modules again sending telemetry and SSDV but with greater resolution and speed, but will require a LoRa receiver/gateway (see Dave Akerman's website).

While the SSDV is attractive to tracker enthusiasts the high speed RTTY is more difficult to receive, so I will be flying a secondary 'backup' tracker. The use of a backup proved invaluable on the Eggsplorer when the main tracker failed.

PIGLET will be a 50-baud RTTY transmission with telemetry and should prove easier to receive.

I finished PIGLET at the weekend


Again built on strip board it is based around the ATMEL ATMega128 micro-controller using the Arduino system with a number of off the shelf modules connected to it.

It has one of the GY-GPS6MV2 GPS modules I blogged about last year feeding into the UART. The NTX-2B transmitter (frequency agile version from Hab Supplies) and a I2C BMP180 pressure/sensor module (not visible as mounted to measure external conditions) It also has a small boost converter to supply 5V and extract all the available power it can from the 3-AA lithium battery pack.

One change compared to the EGG1 tracker is to use a PWM output from the Arduino to generate the RTTY tones rather than a register voltage divider (guide here) which seems to give a cleaner signal.

The antenna is simply copper wire making a 1/4 wave ground plane. The 'box' are some layers of styrofoam glued together with UHU-Por with duct tape, some straws and beads for safety. Just needs the batteries fitting and the lid fixing with more duct tape and PIGLET is ready to fly.



Full details of frequencies will be posted nearer the time.
Andrew Garratt, MØNRD, is a regular contributor to AmateurRadio.com and writes from East Midlands, England. Contact him at [email protected].

Once again, time has gotten away from us. We're so busy with traveling, projects and so forth that we're finding it hard to get the episodes out. We're still recording them on schedule, just the releases are a bit erratic. We still do our live streaming so if you want to catch up quickly, come visit with us on Monday nights when we record. Lots of great stuff in this episode, though. Please enjoy.

73 de The LHS Guys

Russ Woodman, K5TUX, co-hosts the Linux in the Ham Shack podcast which is available for download in both MP3 and OGG audio format. Contact him at [email protected].