Category Archives: Antennas

Articles about Antennas, Feedlines, Towers and related equipment. Fixed, Portable and Mobile Antenna Articles are included.

ISS Crew Contact

We have been working with Hudson Memorial School to help them secure and prepare for an ISS Crew Contact. We are hoping to support their ISS Crew Contact using an upgraded version of our Portable Satellite Ground Station. A school in Raleigh, North Carolina had their ISS Crew Contact today and I decided to record the downlink from the ISS to test our backup Portable 2.0 ISS/Satellite Ground Station.

The video above is a capture of the school’s contact. It was very easy to receive the ISS downlink on our portable backup ground station. I heard the downlink a few seconds before the ISS came up on the horizon and the audio was solid for the duration of the contact. We can only hear the astronaut’s side of the contact as we cannot receive the school’s uplink from Raleigh, NC. The ISS pass began here in New Hampshire part way through the school’s session so we did not hear the first few questions.

Update on Portable ISS/Sat Station 3.0

Portable ISS/Sat Station 3.0 Antenna System
Portable ISS/Sat Station 3.0 Antenna System

Work on our upgraded primary Portable 3.0 Station which includes a larger antenna system using switchable circular polarity is progressing well. The portable tower, upgraded rotator system, and the new, larger 2m and 70cm circularly polarized antennas are complete.  We are just waiting for a few additional components to arrive here and the upgraded portable ground station should be ready for its first test at our Technician License Class later this month.

More on Today’s ISS Crew Contact

You can see a live stream of the ISS Contact from the school above. There is a great deal of planning which goes into an ISS Crew Contact such as this. We are working closely with Hudson Memorial School on their project and their school is also beginning a High-Altitude Balloon Project with us in a few weeks.

The ISS Crew Contact today was exciting to listen too and we are looking forward to being able to share this experience with Hudson Memorial School in the near future.

Fred, AB1OC

80m Broadband Matching System Design and Construction

We installed a 75m loop for SSB operation on our tower when we built it. The loop is full size and is diamond shaped so that our lower SteppIR DB36 yagi can rotate inside of it. The loop is fed at the bottom corner about 20 ft up from the ground. It works great for SSB operation on 75m but we have often wished we could use it across the entire 80m band. This goal led to a project to create a matching system for the antenna. The idea was to use a set of loading coils in series at the feed point create a good match in all segments of the 80m band…

Link to the Full Article: An 80m Broadband Matching System | Our HAM Station

We shared this project at our project night meeting in January. I recently published an article explaining the design and construction of an 80m Broadband Matching System. The ideas used can be applied to many other matching system arrangements for many different types of low-band antennas.

2018 Tech Night Programs (First Half Of The Year)

Tech Night

Here are the plans for Tech Night for the first half of 2018. If you haven’t already done so, please fill out the 2018 Tech Night Survey to provide your input on your choices for future Tech Night activities.

January 9Kit building skillsSteve Elliott, K1EL
February 13Kit build night
March 13Antenna Modeling IB. Scott Andersen, NE1RD and Fred Kemmerer, AB1OC
April 10Antenna Modeling IIB. Scott Andersen, NE1RD and Fred Kemmerer, AB1OC
May 8Antenna Analyzers Advanced TopicsB. Scott Andersen, NE1RD
June 12Field Day Skill Builder

Portable Satellite Station 3.0 Plans

We’ve made about 250 contacts with our Portable Satellite Station 2.0 and we have worked 106 grids which should be enough to earn a Satellite VUCC. We are working on a set of upgrades to create our Portable Satellite Station 3.0 which will support ISS Crew Contacts and be a 90th percentile satellite ground station. You can read more about our 3.0 upgrade plans via the link below.

Fred, AB1OC

Portable Satellite Station 3.0 Plans
Portable Satellite Station 3.0 Plans

Source: A Portable Satellite Station Part 5 – Plans for Our 3.0 Station