RADARS - G4SJM Forum - Recent Posts

RE: Project 2024

John Nowell — Mon, 15 Jan 2024 21:29:40 +0000

Steve,

Certainly the home brew is a great thing to aspire to. I saw Rod walk out with the Solid State Design book. Another great publication is the ARRL's Experimental Methods in RF Design. The building blocks may inspire one or two people. However, the excitement is quite low key at the moment.

John

RE: Project 2024

M0KOV — Sat, 13 Jan 2024 11:31:36 +0000

I've beaten the home construction drum many times at the club. Last year I put forward an idea to build a simple, single frequency ssb transceiver which could be used for a club home-brew net. It was to be based on Peter Parker VK3YE's knobless wonder. I altered the circuit to work on 80m, sorted out a few problems and built a prototype, which worked well, Roy M0RDY is my witness. One or two members showed interest, but I soon realized that it wasn't going to get any further.

I've now come to the conclusion that we need a different approach.

Start at the shallow end.

Any stage should be easy to build and require 10 to 15 components maximum.

Radio amateurs, who like to use home-brew equipment on the air, will already have a home-brew station, so anything built by club members will most likely only go on the air for testing and novelty, very much like the pixie.

Emphasis on learning, how to solder, types of construction, how each stage works, how to fault find, how to test and take measurements. It would be the journey that's more important than the destination.

Rod and I thought it would be best to work through the circuits from 'Solid State Design for the Radio Amateur' Chapter 2, Basics of Transmitter Design.

If anyone is grabbed by the home construction bug great, then we can proceed to dsb, ssb, sdr whatever.

Steve M0KOV

RE: Project 2024

John Nowell — Fri, 12 Jan 2024 19:56:53 +0000

Stephen, M7HFY,

Following on from my Facebook and email message to the group. Last night Rod, G4TEW described an intention for a club project to be a stage by stage modular constructional project. The intent is that members who participated could learn something of the operation and design process as the project proceeded. As a first step I believe it would be good to decide what the finished objective might be, hence my post on Facebook and the Googlegroup.

John, G4FUO

Project 2024

M7HFY — Fri, 12 Jan 2024 15:19:08 +0000

*** clipped from Johns email ****

Last night's meeting at the bunker was very interesting (apart from the QRM from KOV/A....hi). The possibilities of a club project was of great interest to me. So much so that I believe it may be beneficial to start a thread discussing the possibilities of such a project. The first things that sprung to mind on my drive home was:

What frequency or frequency bands will the equipment cover?
What mode or modes will it operate?
In respect of the target project, will it be a receiver or a transmitter or both?
What mode or modes will it operate?
What architecture will it use?

Once those points are determined there will be other design considerations to be addressed, however, first things first.

Thoughts?

73 John, G4FUO

RE: VK2ZOI flower pots and assosiated links

M0DCD — Fri, 20 Oct 2023 08:10:30 +0000

Looking for a cheap (ie use repurposed items) to test my "11m FM" rig when I'm finished fixing it, with a 7m pole, this design looks somewhere near.

However, still needs fettling. Powers up but no audio even with the squelch down. Might be a week or two.

Andy M0DCD / "Tin Snail"?

RE: Raspberry Pi Zero APRS

M7HFY — Mon, 25 Sep 2023 13:40:44 +0000

arecord -l

**** List of CAPTURE Hardware Devices ****
card 0: adau7002 , device 0: bcm2835-i2s-adau7002-hifi adau7002-hifi-0
Subdevices: 1/1
Subdevice #0: subdevice #0
card 2: Device , device 0: USB Audio
Subdevices: 1/1
Subdevice #0: subdevice #0

progress!

pi-aprs.jpg

RE: Raspberry Pi Zero APRS

M0KOV — Mon, 25 Sep 2023 10:22:42 +0000

Start with the very basics.

First find usb sound card settings, at the cli type arecord -l

This should show card and device number.

Then in direwolf.conf scroll down to ADEVICE, remove the # and change the numbers to above if ness.

Next scoll down just past channel 0 to MYCALL NOCALL, remove # and change NOCALL to your call.

Ctrl X and press Y

Next I need to know what you are going to use for PTT

SteveKOV

RE: Raspberry Pi Zero APRS

M7HFY — Mon, 25 Sep 2023 09:55:49 +0000

@m0kov Hi steve.. i got the config file to open but didnt know what to do with it so left it blank and stopped there :-)

It was late and I am not a software guy!

Stephen

RE: Raspberry Pi Zero APRS

M0KOV — Mon, 25 Sep 2023 09:44:03 +0000

Stephen,

First, do you have direwolf.conf loaded?

At the Cli type- sudo nano direwolf.conf

Does the configuration file open for editing?

SteveKOV

Raspberry Pi Zero APRS

M7HFY — Mon, 25 Sep 2023 08:46:48 +0000

So Steve KOV has finally sold me on the idea of building a pi based APRS thing! I dug around the workshop, found most of the bits I needed, did some soldering, bought some more bits and......

I have a working pi with all the necessary sensors, some software loaded, remote desktop configured and working but I have hit a brick wall trying to load/configure Direwolf.

I am not a programmer!

Asking for a friend :-)

pi-aprs.jpg