Category Archives: Wireless General

Pinal Mountain (and summiting Signal Peak) 15APR18

Drove up to Pinal this morning to swap out some equipment. Getting to/from Pinal from the highway isn’t difficult, just 18 miles, with 12 of them on a really great-condition (at least until the rains come) dirt road.

Once I was finished with my other hobby, I started down the road and parked at the Signal Peak turnoff (651B). As I’d never been to Signal, and I’d never used the mobile PeakBagger app to record a hike, I was able to do both and learn a thing or two or three new things.

The first thing I learned was that Signal was less than 300′ minimum prominence, and that’s what I’d set my PeakBagger filter for, so Signal didn’t show up until I dialed that down to 250′.

http://www.peakbagger.com/climber/ascent.aspx?aid=950119

7812′ elevation – clean prominence: 252′ – isolation: 1.1 mi

GPS log available at peakbagger link above.

Time-lapse video of trip from US 60 to Pinal and back

Signal Peak benchmark directly under fire lookout tower.

Looking NW toward fire lookout tower and cabin.

 

Summiting Newman Peak 11MAR18

http://www.peakbagger.com/climber/ascent.aspx?aid=937700

~4500′ elevation – clean prominence: 2500′ – isolation: 24.5 mi

GPS log available at peakbagger link above.

Time-lapse video of drive off pavement

Wireless communications site – off-grid

At the trailhead around 1000. Cloud cover promised a cool day for a hike.

Looking down the main canyon back toward the CAP Tucson extension (the curved line in the middle-foreground). Trailhead is just about where the canal touches the right canyon slope.

Now in the narrow slot that climbs abruptly out of the main canyon.

A handy, helpful bit of guidance for someone who’s vertical-orientation challenged.

Continuing up the slot, view is opening up as clouds break up. Can see at least 100 miles. Rock towers abound.

Atop slot, great views. The hogback-shaped peak in the distance is Table Top, which I’d summited the day before.

While it can’t be seen in this photo, my white truck is naked-eye visible at the trailhead, just to the right of the bridge over the canal.

There really is an end to this climb! Newman radio site in view from below.

Benchmark and peak register.

Again.

That little bump in the center middleground is Picacho Peak. Kinda small from here. Also, the trains were very hearable when they blew their horns.

In far left, Catalina Mountains and Mt Lemmon. In far far center, Baboquivari. A frickin’ gorgeous day for a climb.

More or less east from the site.

Towers.

More towers. And remember to smile, ’cause you’re on camera!

Towers bristling with radomed-microwave dishes.

Another view.

Want to lease space at the site? Call the number.

This power pole is the top end of the line down the side of the mountain. Only single-phase power, anyone know what voltage level?

A shot of the hump at the southernmost part of the main Picacho range, with Picacho Peak in the left background and the freeway easily visible.

Final shot of radio stuff. I promise.

View to the NW, with the Sierra Estrella in the left background, and Camelback even visible (but not in this scaled-down photo).

End of the trip, just on the east side of the CAP Tucson extension. Not a single person seen. Very isolated. Back to vehicle around 1600, and out to pavement and I-10 about 45 minutes later.

And while I’m at it

Last week I had the pleasure to spend in far-south Chicagoland, where it started out 48 °F and raining and ended up 18 °F with black ice everywhere. Not immediately, but once the ice formed, it stayed in place the rest of my visit. Made for some dicey walking.

However, my buddies at the RR, like the post office, work rain or shine, ice or sleet, snow or sand, and were busy installing my hoped-for array of antennas on a homebrew rack up on the roof.

Little hard to see in the photos, but it’s basically a triangular array of 3 tripod mounts held down with a bunch of concrete blocks, then two-sided unistrut forming two vertically spaced equal equilateral triangles, upon which it’s easy to set vertical pipes to attach antennas.

Right now the lab I’m helping to build (in the building below) needs far better cellular connections for the industrial modems that we’re testing, so the antennas on the roof will solve a lot of our mysterious connectivity problems.

The lab also needs a solid GPS antenna on the roof – I have a rack-mounted 8-way GPS splitter inside and I’ll feed one antenna to multiple devices in the lab that need GPS.

The runs from the antennas on the roof to the rack are all 1/2″ superflex, and we’ve got grounded lightning protectors at the rack and shield grounds just before the coaxes penetrate the building. We’re also way lower than many better lightning targets all around us, so we’re probably as safe as we can be.

Next step is to head back there and start assembling some LMR240 jumper cables to run from the rack connections to the final resting places for the signals received.

It’s fun working on the railroad.

Update on the rooftop amp

Last time we visited the roof, the amp followed by the FM BCB notch filter was now in the die-cast enclosure, but not actually attached to anything.  Now it finally has a home, at least for now, on the tripod leg. It required a visit to Artie’s Ace Hardware in Phoenix at Tatum and Thunderbird, which until about 8 hours ago was unknown to me as a purveyor of a near infinite number of different kinds of metric fastener! Only 4 miles away, it’s a treasure to know that I can get an M4x8 mm pan head screw even late in the afternoon.

The metric hardware was required to install the steel mounting ears on the die-cast enclosure; those mounting ears accept the muffler clamps that hold the whole thing to the leg of the tripod. Later on this winter I’ll bend up some 0.032 Al sheet to act as a sun shield and remount the box on the north leg with the shield to keep it cooler during the summer. I still need to do something permanent about the power for the amp, it’s currently the solar power setup I made a couple weeks ago.

Left is input, right is output. Runs on any voltage up to about 32 vdc and down to about 7 vdc. The internal dc-dc converter keeps the amp supplied with an even 5.0 volts.

With this amp in place, my stack’o-scanners is just bangin’ along. I’ve got great reception, and no FM BCB interference. And, there’s space in the enclosure for a future Arduino or Raspberry Pi, as well as the necessary network connection.

Shocking new amplifier

Is finally built. I bought three of these a couple years ago from kuyaya520 on eBay and they’ve languished since then, heat-shrink protected and tie-wrapped in place, like for the truck’s half-deaf GRE PSR-600 scanner.

Finally put one in my new die-cast case that I got 10 of last month, and used a 82 ohm resistor to set the operating voltage to around 10 vdc when running off 13.8 vdc. According to the eBay page about the amp, its best gain and noise figure is around 9-10 vdc.

Checked out the gain, and it’s pert darn near what the vendor says it is. Don’t have a simple way to do noise figure. Need to get myself an ENR noise diode so I can do y-factor.

This amp will likely go into the truck to replace the tie-wrapped kludge… I’m starting to get reasonably good at assembling these things.

Next step on the rooftop LNA setup

This past weekend I finally started building the ultimate case to house the LNA and FM BCB filter for the rooftop multireceiver project.

Last night I did the final bit of wiring, installed a DC-DC buck converter to take +12 vdc and knock it down to 5.0 vdc.

Here’s some pics of the project.

The two separate die-cast enclosures are the LNA (lower) and the FM BCB notch filter (upper). There’s a LM2596 DC-DC converter in the lower left, and a weathertight Ethernet connection in the center-right wall. All external RF connectors are N. All internal connectors are TNC. All coax is RG316 double-shielded. I used an Ethernet connection to get power to the box and to allow the future addition of either an Arduino or an Raspberry Pi for telemetry purposes.

The overall enclosure with installed components. Got this particular enclosure for about $22 delivered – someone in Santa Maria CA didn’t want it. Was missing the base plate upon which I mounted all the components – fortunately, I had a piece of Al in the garage that was a near-perfect fit! Would have cost nearly $70 new.

The left N connector is the antenna input, the right N is the assembly output to the shack. The Ethernet connector is for future expansion and dc power.

Installed on the roof temporarily (will be mounted on the tripod to right ultimately) with power supplied by batteries in the Tupperware container.

The batteries (Eneloop AA x 10) are charged with a newly modified solar panel install. Again, over the weekend I cut some Al extrusions to replace the old way I’d attached a single 5 w solar panel, now it supports two 5 w panels for a total of 10 w. This almost guarantees sufficient charge for long winter nights.

In addition, the box mounted on the tripod already had a PoE Ethernet connection from the main rooftop unit. I use that 12.6 volt PoE  through a single 1N4001 rectifier to source power to the LNA box when the solar panels can’t provide enough charge to keep the batteries up. I want to add some telemetry (through a future Arduino or similar on the roof) to measure voltages, temperatures, etc.

 

Scanners set up for monitoring/tracking aircraft

I un-mothballed a number of my old trusty-rusty Radio Shack PRO-2052 scanners for monitoring aircraft operations here in the valley.

With the new VHF/UHF multireceiver antenna setup, it’s very easy to have a number of scanners all running in parallel so that I don’t miss as many conversations and handoffs.

Here’s the stack of scanners: the top is ZAB (Albuquerque Center); the middle is Phoenix area TRACON; the bottom has both KSDL (Scottsdale airport) and KPHX (Phoenix Sky Harbor airport) in there so that I can monitor either or both.

I put different color LEDs for the display backlights. Yellow is top; orange is middle; red is bottom.

10 MHz bandpass filter from China

Saw this 8 to 11 MHz band pass filter (item number: 201406314462) on eBay a few weeks ago and thought it might come in handy to help my SDR radios hear WWV and WWVB while not being overwhelmed by other signals.

Here’s what the 1 to 100 MHz band looks like using the PCR-1000 connected through the new antenna multicoupler, without the new filter. Remember, this antenna setup already has some significant attenuation below about 100 MHz since it’s using a VHF/UHF discone and the 10 to 2000 MHz LNA.

Here’s a plot using the ICOM PCR-1000 using the new BPF. Indeed, it has good performance, especially for the US$11.48 incl shipping.