Tag Archives: HF

Time to Prepare for Field Day 2017

On Christmas morning, it always amazes me how the kids can rip the packaging off all their gifts in mere minutes.  The smile on their faces and their pure joy and excitement makes it all worthwhile.  What took months of planning, shopping, hiding, wrapping is over before you know it.  As they say, you get much more out of giving than receiving.

As you might imagine, there is a parallel here to field day.   Sure, you could just show up at Field Day on Saturday morning, and everything would be setup and ready to go.  However, much of the value comes from all the strategy, planning, preparation and setup activities.  Despite the large investment the club has made in towers, antennas, generator, etc., It takes a small army of volunteers to get this right.

This is my first year as field day chairman.  Truth be told, I only attended my first Nashua Area RC field day last June, and was truly impressed.  I was reluctant to volunteer last year, as I just didn’t quite know what I would be getting into.  I suspect many of you are feeling the same way this year.  Whatever the excuse; I haven’t been a ham long enough, don’t know if I can devote the time, I don’t know anything about field day, etc.  Trust me, you can and will add value to this event.  Like Uncle Sam used we say, we need you!

Now that it’s the new year, we are going to start having a regular series of meetings to plan for Field Day 2017.   The first meeting will be centered around what we learned from field day last year.  I’m looking for some early ideas about new things we can do to make field day more interesting and relevant for each of you.  Please feel free to contact me at [email protected] anytime with your ideas.

Some of the preliminary feedback I have received is tactical in nature.  It includes the following:

Current Field Day electrical distribution setup
Current Field Day electrical distribution setup
  1. The Electrical distribution system needs help. The current system consists of a Honda ES-6500 Generator with 240v distribution lines to step-down transformers at the tents.  The main distribution panel needs to be completely rebuilt and reduced in size.  Additionally, the whole setup isn’t currently weatherproof.  The existing distribution “cables” are single-conductor THHN wires taped together which certainly isn’t optimal.  Ideally, we should start with a clean sheet of paper and rebuild this properly.  Perhaps a small transfer switch so we can run two generators (so one can be serviced while still operating), with twist-lock plugs on the distribution cables and transformers, and proper SJOOW cable.  This effort alone would exceed the club budget for field day, so we could use donations of time and materials.
  2. The club owns a significant amount of coax cable. However, much of it is quite old and the connectors have seen better days.  I will look to schedule a tech night to put on new connectors and weatherproof using head-shrink with adhesive-lined backing.  We also need to make-up some short patch cables to connect to the club’s bandpass filters.  We should also label all club cable with the club call.  Finally, we need to determine the best strategy to coil up and store the coax without kinks.
  3. The iron anchor stakes for the towers need to be modified to have a sharp point at one end. Someone with a grinder could do this in relatively short order.  We could also benefit from having a large hammer drill on-site with a ground rod bit to drive them in.
  4. We need to review the hardware and storage containers used to assemble the towers. There was a recommendation to use shoulder bolts that are smooth and unthreaded through the tower to prevent crushing. Also, many of the storage containers are cracked and need replacement.  Need to inventory and rebuild these kits.
  5. We have a trailer, affectionately referred to as BOB (the Big Orange Box) at the Nashua Wastewater Treatment Center. I understand this could use some reorganization.  We need mount some brackets to the wall to get things up off the floor.  Also, we should group each of the tower kits together.

So what should you expect from me?  I will be looking to divide the work up into a series of teams and assign leads for each.  The teams will include a site readiness team, electrical, tower and antenna construction, safety, transportation, food, and potentially others. Many hands make light work, and there’s something here for everyone.

The preparation begins now.  Who said it can’t be Christmas in June?  Let the excitement begin!

Dave, K1DLM

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A First Homebrewed Transceiver

I recently wrote an article about Nashua ARC’s 2017 Project Night (forgive my shameless self-promotion). In it, I expressed my awe of what our club members can do, and how it has inspired me to attempt my own first build.

The winter really is the best time to do this. And it’s time for me to embark on this journey of fun, learning, and frustration! So I turned to Mike (AB1YK) who knows about such things since he and I are attempting to organize a future summer weekend Tech Build Event for the club. The Pixie and the DSO138 oscilloscope are the warm-ups for this main-event. One suggestion Mike threw out was a Direct-Conversion Receiver (DCR) as advertised in the January 2015 issue of QRP Quarterly which you can actually download here (and as far as the application to the Tech Build goes, perhaps we only build parts of the DCR given time constraints). This article is entitled Let’s Build Something: Part I by Ben Kuo (KK6FUT) and Pete Juliano (N6QW).
Homebrewed Transceiver Block Diagram

In it, they outline the main building blocks of the build. The nice thing about this build is once one is done, it is amenable to some modular alteration to turn it into a fully working QRP SSB transceiver! (Though I do not know how much wattage at this stage) The other nice thing about this build is all the parts are clearly labeled and Pete provides links at the end of the article for YouTube videos about the build. Maybe it’s just my noob eyes, but I find the videos moderately useful for someone starting from scratch, but I can see the utility for a more experienced builder. Additionally, this build utilizes the Manhattan style of building. I find this optimal for someone just starting out because I can easily visualize all the connections between the components and have relatively easy access to make measurements and tests with probes.

Let’s go through parts and I’ll tell you what I know (at a cursory level) and what I don’t

  • 40m bandpass filter: Totally on this one. I’ve never built a filter before but looking forward to doing this. In fact, I need to build one for my ADS-B antenna at 1090 MHz, but it doesn’t seem feasible to do from components at that frequency. Any ideas anyone? I’m kind of stumped.

Homebrewed Transceiver Bandpass Filter Schematic

  • RF amplifier: REALLY looking forward to tackling this one, but this won’t be the first thing I do. Makes sense to have for weak signals.

Homebrewed Transceiver RF Amplifier Schematic

Homebrewed Transceiver RF Amplifier

  • Double-balanced mixer: Now I know something has to knock the RF down to an intermediate frequency (IF) and when I see mixer, this is where my brain goes.  The double-balanced bit was foreign to me, but as advertised in the article (‘double balanced’ implies that the original signal and local oscillator frequencies are deliberately nulled out as part of the mixing process and do not appear at the output.)

Homebrewed Transceiver Double Mixer Schematic

  • Arduino Based Sample DDS: In order to even produce an IF, we need a local oscillator (LO). This is where the Arduino comes in. The authors argued they looked at a number of options for the LO including a VFO (variable frequency oscillator), a varactor tuned oscillator (should know this from my Extra exam — but full disclosure — I can’t help you now), and a DDS (direct digital synthesizer). They felt the simplest option was the DDS (hence the Arduino).

Homebrewed Transceiver DDS Schematic

  • Audio amplifier: We want to amplify the audio signal so we can hear it through our 8 Ohm speaker!

Homebrewed Transceiver Audio Amplifier Schematic

So now if you put all the components and modules together, you arrive at something which should look like:

Homebrewed Receiver

I like this project for a few reasons.

  1. It’s a more interesting build and takes longer than 2 hours.
  2. It will have amateur radio applications in my shack. I do hope to work some pretty cool QRP with this rig (when I turn it into a full-on transceiver).
  3. I will learn A LOT about the electronic components integrated into the rig and be able to have an excuse to buy some test equipment.
  4. I get to work on my soldering skills.
  5. The modular design is attractive so that if I wish to make alterations in the future, it seems I will readily be able to do so without having to tear the entire rig apart.
  6. Understanding, at the end, how all of these parts function together to make my transceiver work. I look forward to sharing whatever knowledge I accrue during this build with future amateur radio hobbyists just breaking in.

I will certainly post articles as my progress commences. Currently, I am in the market to buy components and test equipment and will begin to build probably the simplest module first; currently, that seems to be the filter. And I have learned a very valuable lesson from being in the club and participating in its activities that I am applying to this build. Initially do things to set yourself up for the highest probability of success so that you keep your morale, interest, and momentum high. Nothing is worse than diving head-first into the hardest part of a project and losing any and all ambition when things begin to not work (and they will…).

73,

Brian, AB1ZO

N1FD Contest Team Completes Sweep of 2016 ARRL Rookie Roundup

The scores are in!  The N1FD team placed #1 in Area 1 Multi-Op category in the ARRL Rookie Roundup CW!  We have won the Area 1 Multi-Op category in all three Rookie Roundup contests this year.    The complete results can be found here.

2016 ARRL Rookie Roundup CW Final Score
2016 ARRL Rookie Roundup CW Final Scores

Congratulations to Abby, KC1FFX and Jamey KC1ENX, who operated in the contest!

Radio Amateurs Developing Skills Worldwide