Tag Archives: VHF/UHF

High Altitude Balloon Project Update #1

I just wanted to take a moment and update everyone on our progress on our High Altitude Balloon project.

Our fundraising efforts are complete and were very successful thanks to the generosity of our members and many friends.

We have secured support from two area high schools for our project Merrimack HS and Bishop-Guertin HS. Currently, we have a total of 10 – 12 young people who have joined our project.

High Altitude Balloon Classroom Topics
High Altitude Balloon Classroom Topics

With help from local teachers, we have developed a curriculum and classroom materials to help the teachers we are working with to deliver classroom sessions on the science behind high altitude balloons and the associated radio technologies. The classroom instruction began with a session at Merrimack High School this week.

We have purchased the balloon kit and supporting electronics and we are planning a session to test everything later this week.

Our planned launch date at this time is on May 13th. We are also planning an open house at AB1OC/AB1QB’s QTH the week before the launch to allow the students to test their balloon and to learn more about Amateur Radio.

We’ll post more here as the project progresses.

Again, thank you all very much for supporting our work.

Fred, AB1OC on behalf of the HAB Team

Add CTCSS PL Tones to Your Old VHF Rig

Last week I gladly accepted a free Azden 2m FM transceiver model number PCS-4000 that was offered to me.  You have to love the old free stuff!  The only capability this 25W rig was missing is the ability to transmit CTCSS PL tones or sub audible tones to activate a repeater.

I found the manual and schematics online and found that this rig was built to accept a tone generator as an add-on. See below.

PL Tone Mod Circuit

Below is a photo showing the jumper locations for the tone input.  I soldered some leads with a home brew disconnect to easily remove the cover in the future.PL Tone Mods

Below is a photo showing an added 1/8″ mono jack for the input tone.

PL Tone Mods

For an input tone, I used an Android cell phone with a frequency generator App to generate the PL tone.

PL Tone Generator

I can experiment with other ways to generate the tone such as an Arduino with RC filters etc.  I can also try to insert a 700 Hz tone with my Arduino keyer for MCW.

Below is a photo of the rig set up for a local repeater.

Completed Mod to add PL Tones

So now to quote Pete Juliano “Bob’s your uncle”!!!

73,

Mike, AB1YK

New Amateur Satellite: EO-88 aka Nayif-1

Source: EO-88 aka Nayif-1 | AMSAT-UK

AMSAT-UK and AMSAT-NL are delighted to announce that a FUNcube communications package has been selected as a major payload for the Nayif-1 CubeSat mission.

Nayif-1 Mission Patch

This mission is intended to provide Emirati students with a tool to design and test systems in space. It is being developed by the Emirates Institution for Advanced Science and Technology (EIAST) in partnership with American University of Sharjah (AUS).

It is expected that this payload will provide a large amount of valuable environmental data from space together with a new, enhanced, UHF to VHF linear transponder.

The AMSAT team will be working closely with the Emirati students, in collaboration with support partner, ISIS – Innovative Solutions In Space B.V. from the Netherlands, to develop this new system in time for the launch which is scheduled to take place early 2016.

Looks like this new satellite is now available for Amateur Radio use. I have not had a chance to try to work contacts through it yet. Here’s the transponder information:

Communication subsystem

Inverting SSB/CW transponder 300 mW

  • 435.045 – 435.015 MHz Uplink
  • 145.960 – 145.990 MHz Downlink

Operational when in eclipse

Telemetry subsystem

145.940 MHz BPSK Telemetry 300 mW

Operational when in sunlight

More information about EO-88 may be found on the AMSAT-UK page for this satellite.

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