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So I grabbed a suitable photograph from the web, edited it fairly heavily, and incorporated in a new web server program that populates the screen with balloon telemetry and the terminal session.I wrote this in Delphi, with some Python to grab the telemetry from Habitat.A new puppy solved the first problem by eating one earpad, which prompted me to order the far comfier Large Grado Pads, called the S-cushion and widely available online for –.

Fifteen years later, I still own those SR60s, and use them almost daily (mostly with my TV, the sound channeled through my Benchmark DAC1 D/A converter).

They've given me just two tiny problems: The original earpads were uncomfortable, and I lost the tiny rubber endcaps that secure the earpieces to the headband.

The SR60s' subsequent success is easy to understand.

It sounded good—honest, musical, warm—and it was cheap.

Periodically, when the tracker receives an uplink it will reply with a telemetry string so that the gateway can upload the balloon position to habitat as usual.

The string is standard except for the addition of some status information about the uplink.This was a fun flight to provide a remote serial terminal on a Pi, between ground and a high-altitude balloon, using a bi-directional radio link.Most high altitude balloon flights use a simple unidirectional data stream from the balloon to the ground, sending the telemetry (balloon position and sensor data) and sometimes images too, from balloon to the ground.Most often this is RTTY or (in the USA APRS) but there are alternatives such as Lo Ra which more easily provides a means of reliably transmitting data to the balloon as well as from it.This greatly expands the range of things we can do during a balloon flight, for example: Another possibility is to run a terminal session between ground (client) and balloon (host), allowing programs to be run on the balloon tracker as requested by a ground station: This could even be used to change the tracker program, or have that program use new configuration parameters.Corey Greenberg, in his June 1994 review of the Grado SR60s (Vol.17 No.6), noted that, after auditioning many of the affordable headphones then available, "I just wanted to lower myself into a tub of Noxzema and be left alone for a couple of months." I'm not exactly sure what he meant by the Noxzema bit—I've never been afflicted with that particular temptation—but I figure it can't be good.

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