Category Archives: Amateur Radio

[Part 3] ALSA Speech Compression and FT-857D

This is an update of my previous post

As testing goes on, the .asoundrc file is getting more complexed in its setup. This is where we are up to now, we have 2 profiles going for ‘local’ and ‘DX’ and we select between the profiles by running in terminal

Local:

$ arecord -B 12000 -D local_eq_ -r 44100 -f S16_LE | aplay -B 12000 -D ladcomp

DX:

$ arecord -B 12000 -D dx_eq_ -r 44100 -f S16_LE | aplay -B 12000 -D ladcomp

And now for the dreaded .asoundrc file.
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[EVENTS] AHARS Hamfest Sunday Nov 4th

Adelaide Hills Amateur Radio Society Inc.
When: 4th Nov. 2012, Entry from 9am, entry to sale hall from 9.30. $5 entry includes 2 raffle tickets
Where: Goodwood Community Centre 32-34 Rosa St Goodwood.
See AHARS for full details of vendors present and the generous door prizes offered. NERC and ALARA will provide refreshments.

Map:

[Part 2] ALSA Speech Compression and FT-857D

This is just an update from my older post. I have built an isolation box to use between the computer and the FT-857D which at the moment only consists of two 3K 1:1 audio transformers and 500K trimpot to not over load the radios audio input on the data port. I have still got to add the optocoupler into the box so can get the computer to control the PTT via the data port too.

At the moment there has been no noticeable different in the audio quality with the isolation transformers inline, and the compressed audio still sounds good :-)

ALSA Speech Compression and FT-857D

Well friend and I have been playing around with speech compression as the FT-857D on it own does not have the best DSP. As my friend is keeping a better log of it all and how to set up up on the Raspberry Pi head on over to VK2MEV’s site and check it out.

I have the speech compression running on my computer rather than the raspberry pi at the present moment for testing purposes, but will get around to setting it up on the raspberry pi at later date.

My setup consists of:
Computer
Creative Sound Blaster Play USB Dongle
Heil Pro Set Elite
FT-857D
Necessary cabling to connect between the data port on the FT-857D and the USB dongle and headset

VHF/UHF Field Day Survey closing in 1 week 14/10

First, this Proposal for changes to scoring of Australian VHF/UHF Field days. This proposal outlines the rationale for these field contests, examines how well they meet their aims, how the current scoring system works and reveals some anomalies in the scoring system used. Then the reasons for changing the scoring system to one based on distance worked, and removing the link to grid squares worked, are explained and some details are provided of how that change can be made.

The Survey

Reference:
http://vk1da.net/

Yaesu FT-857/897 DSP and Carrier Point Settings

Menu 46 DSP High Pass filter Default at 100. Set that to 200 to 300 on the low-end

Menu 48 DSP Mic Equalizer

Press and hold in the [DSP] key for one second. This instantly activates Menu Mode No-048 [DSP MIC EQ].
Rotate the DIAL to select one of the following equalization choices: OFF: Microphone Equalization Off
LPF: High Cut (lower frequencies are emphasized)
HPF: Low Cut (higher frequencies are emphasized)
BOTH: High/Low Cut (mid-range frequencies are emphasized)
When you have made your selection, press and hold in the [FUNC] key for one second to save the new setting and exit to normal operation.

You also have menus 016 Carrier Balance -300 to +300 LSB Transmit and 018 Carrier Balance -300 to +300 USB Transmit Adjusting these controls will give you more low response or high response. As always listen to your test signal through headphones connected to a second receiver. You will hear the balance that will please you.

As always study the operation guide for further information.

Reference:
Heil Sound – All Things Yaesu
Audio processing and ALC in the FT-897D

Giveaway to Promote Youth in Amateur Radio

Amateur Radio Supplies in the USA are holding a contest January 2013 to give away a DX HF setup to promote youth in the world of Amateur Radio in any country.

Haverhill, Mass., September 24, 2012 – Amateur Radio Supplies of Haverhill, Mass., announced today a new biannual giveaway to promote youth in amateur radio DXing and contesting. “Getting on HF (high frequency) in today’s economy is very challenging for many, but especially for our youth operators,” said Jeff Demers, owner, Amateur Radio Supplies. “Many youth operators are unable to purchase the needed equipment to get on the air. Here at Amateur Radio Supplies, we want them to experience the joy that has propelled us in this hobby for many decades. Thus, on January 1, 2013, we’ll be doing the first of many station sponsorships to support youth in DXing and contesting.”

Amateur Radio Supplies will give a complete HF (high frequency) station to the selected applicant, including:

Alinco DX-SR8T/E 160-6m All Mode Transceiver & 30 Amp PS
LDG AT-100 Pro II Desktop Antenna Tuner
Choice of Rugged All Band G5RV or HyGain DX-77A Vertical 100’ of
Premium RG-213 Coax
Vibroplex Brass Racer Iambic Paddles
SignaLink USB Sound Card for Digital Modes
Heil Pro Set Plus Headset

Applicants from any country under the age of 21 are invited to provide brief answers to the following three questions, as well as their name, call sign, and license class online.

1. How often are you able to operate on the HF bands?
2. Where (what QTH) do you typically operate from?
3. How do you intend to use the equipment provided?

Further Details and Aplication forms can be found at Amateur Radio Supplies