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Tag: aprs

Home Posts tagged "aprs"

Simple audio streaming server using socat

Simple audio streaming server using socat
Misc  aprs / linux February 18, 2023 February 18, 2023

I was suspecting a receive issue on our club’s mountain top APRS digipeater. To spare me the 1 hour drive to listen to the radio’s audio I came up with the idea to remotely stream …

Read more"Simple audio streaming server using socat"

Modding the Kenwood TM-271 for voice alert

Modding the Kenwood TM-271 for voice alert
APRS / Ham Radio  aprs / kenwood / tm-271 / voice alert February 2, 2023 February 4, 2023

I have been using the TM-271 for my mobile APRS operation for over 18 Months now. Here is a quick article on how you can enable the radio for APRS Voice Alert. It is all …

Read more"Modding the Kenwood TM-271 for voice alert"

We do not give a f*ck about your repeater!

We do not give a f*ck about your repeater!
APRS / APRS Explained / Ham Radio  aprs January 29, 2023 January 30, 2023

Here is a provocative/clickbait headline, and it is on purpose. Today I want to rant about APRS sysops abusing objetcs. Usually I try to keep the content here technical, but now is the time for …

Read more"We do not give a f*ck about your repeater!"

Direwolf: add pre-emphasis to your AFSK signal

Direwolf: add pre-emphasis to your AFSK signal
APRS / Ham Radio  alsa / aprs / direwolf / kenwood / linux / tm-271 January 28, 2023 February 3, 2023

Direwolf is very capable software TNC, yet it is not yet possible to add twist between the high and low tone e.g if you want to feed 1200bps to the 9600bps flat audio input of …

Read more"Direwolf: add pre-emphasis to your AFSK signal"

Setting optimal receive level for the Tinytrak 4

Setting optimal receive level for the Tinytrak 4
APRS / Ham Radio  aprs / tinytrak / tt4 December 16, 2022 January 9, 2023

Recently I got myself a Kenwood TM-271 and wanted to give it a go on APRS with the TT4. This turned out to be more complex than expected.

Read more"Setting optimal receive level for the Tinytrak 4"

Start Direwolf at Boot, the SystemD way

Start Direwolf at Boot, the SystemD way
APRS / Ham Radio  aprs / direwolf / systemd April 17, 2022 January 2, 2023

The ways to start Direwolf at boot, as provided in the manual, are quite archaic and hacky. Let’s see how we can do this in a more modern way using systemd.

Read more"Start Direwolf at Boot, the SystemD way"

Doing APRS Voice Alert with CRT 2M / Anytone AT-588

Doing APRS Voice Alert with CRT 2M / Anytone AT-588
APRS / Ham Radio  anytone / aprs / tinytrak / voice alert October 22, 2021 November 19, 2021

After trying and failing at getting a working APRS set-up with voice alert here is my last try with a CRT 2M Radio, a rebranded Anytone AT588.

Read more"Doing APRS Voice Alert with CRT 2M / Anytone AT-588"

Putting a 3.3V HC-05 module in the Tinytrak 4

Putting a 3.3V HC-05 module in the Tinytrak 4
APRS / Ham Radio  aprs / bluetooth / tinytrak October 1, 2021 October 2, 2021

If you followed my previous adventures with the Tinytrak 4 and Bluetooth you may know that I used HC05 modules which where RS232 levels capable. I bought these years ago and, as of today, they …

Read more"Putting a 3.3V HC-05 module in the Tinytrak 4"

HC-06 and Tinytrak : Fail

HC-06 and Tinytrak : Fail
APRS / Ham Radio  aprs / bluetooth / hc-05 / hc-06 / tinytrak January 30, 2021 September 22, 2021

A couple of month ago I Bluetooth enabled my second Tinytrak 4 using a HC-06 module. It turned out this failed after a few weeks and the HC-06 is not usable for APRS.

Read more"HC-06 and Tinytrak : Fail"

Retevis RT98 for APRS, review 8 weeks after

Retevis RT98 for APRS, review 8 weeks after
APRS / Ham Radio  aprs / retevis / RT98 / voice alert January 15, 2021 January 15, 2021

After almost 8 weeks of using this little radio for my mobile APRS operations I thought it’s a good time to provide some feedback. I must admit I have mixed feelings about this radio…

Read more"Retevis RT98 for APRS, review 8 weeks after"

Analog vs. Digital APRS

Analog vs. Digital APRS
APRS / APRS Explained / Ham Radio  analog aprs / anytone / aprs / digital aprs December 30, 2020 August 11, 2022

I keep on reading about “Digital APRS” vs “Analog APRS”. Youtube and social media are full of these words. This is utterly wrong. Whenever I hear “Analog APRS” I’m going mental: “Analog APRS” simply does …

Read more"Analog vs. Digital APRS"

Bluetooth and TinyTrak 4, episode 2

Bluetooth and TinyTrak 4, episode 2
APRS / Ham Radio  aprs / bluetooth / tinytrak November 1, 2020 January 30, 2021

I got myself a second TinyTrak 4 and wanted to Bluetooth enable it like I did for my first one. I went a different route using a different module and wiring it another way.

Read more"Bluetooth and TinyTrak 4, episode 2"

What is APRS Voice Alert ?

What is APRS Voice Alert ?
APRS / APRS Explained / Ham Radio  aprs / voice alert October 25, 2020 October 1, 2022

Ever got frustrated of not being able to contact a passing by station you just saw on APRS? APRS can also work as a nearby station radar and help you out with that.

Read more"What is APRS Voice Alert ?"

Using the Retevis RT98 for APRS with voice alert

Using the Retevis RT98 for APRS with voice alert
APRS / Ham Radio  aprs / retevis / RT98 / tinytrak / voice alert October 21, 2020 October 21, 2022

My TYT THD9000 started to exhibit some strange behavior, after transmitting it sometimes needs half a second to switch back to receive. So I was in the market for a new APRS radio and came …

Read more"Using the Retevis RT98 for APRS with voice alert"

Putting Bluetooth into the Tinytrak 4

Putting Bluetooth into the Tinytrak 4
APRS  aprs / bluetooth / tinytrak / tt4 / tt4bt June 15, 2019 October 2, 2021

Byonics provides a Bluetooth add-on for the Tinytrak 4. While I love the TT4 I am not a huge fan of their TT4BT Bluetooth solution. It consists of a board with 2 DB9, no case …

Read more"Putting Bluetooth into the Tinytrak 4"

APRS.fi is not APRS-IS

APRS.fi is not APRS-IS
APRS / APRS Explained  aprs / aprs-is / aprs.fi November 25, 2018 June 16, 2019

There is a widespread belief that aprs.fi is the internet backbone of the APRS network. It is not uncommon to read posts on social networks saying “I am connecting to aprs.fi with aprsdroid” or “I …

Read more"APRS.fi is not APRS-IS"

APRS with Tinytrak 4 and TYT TH-9000D

APRS with Tinytrak 4 and TYT TH-9000D
APRS  aprs / th-9000d / tinytrak / tt4 / tyt February 23, 2018 July 13, 2019

After a couple of frustrations (here and here) I have finally managed to get my TYT TH-9000D running quite well with my Tinytrak 4. After a few weeks using it I must say I am …

Read more"APRS with Tinytrak 4 and TYT TH-9000D"

And so I wanted to use a TYT TH-9000D for APRS …

And so I wanted to use a TYT TH-9000D for APRS …
APRS  aprs / problem / tt4 / tyt January 28, 2018 July 13, 2019

I was in the market for another radio for my mobile APRS operations. After reading various articles (here and here) about the ability to add a D-SUB9 connector with all relevant signals for that matter. …

Read more"And so I wanted to use a TYT TH-9000D for APRS …"

Latest Posts

  • Simple audio streaming server using socat
  • Modding the Kenwood TM-271 for voice alert
  • We do not give a f*ck about your repeater!
  • Direwolf: add pre-emphasis to your AFSK signal
  • Setting optimal receive level for the Tinytrak 4

Recent Comments

  • F4FXL on Putting a 3.3V HC-05 module in the Tinytrak 4
  • Brian on Putting a 3.3V HC-05 module in the Tinytrak 4
  • F4FXL on We do not give a f*ck about your repeater!
  • Marty on We do not give a f*ck about your repeater!

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