Above Ground vs Below Ground Radials
- Details
- Written by: G Wolfe - KI0KK
The eHam Elmers Forum has an interesting discussion on the placement of Radials.
https://www.eham.net/ehamforum/smf/index.php/topic,125536.0.html
RF Design Tools
- Details
- Written by: G Wolfe - KI0KK
From: Jerry Egleston, W0AJ, via Larry's List
Hi Larry,
I came across this website while searching the net. There are several free RF design calculators on the site and one can print a free PDF of a Smith Chart in color or B/W. Fellow hams might find it worth taking a look.
<http://www.leleivre.com>
73,
Jerry Egleston, W0AJ
Bench - RSPplay Spectrum Analyser
- Details
- Written by: G Wolfe - KI0KK
Most hams buy an SDR RCVR to monitor the bands. I found this unique application for the SDRplay RSP1A as a Spectrum Analyser for your test bench. The RSP1A is know for it's level accuracy and high sensitivty. This make the RSP-1A an excellent candidate for making accurate measurements that normallly rrquire a high priced piece of test equipment.
The Spectrum Analyser is based on an Application written by Steve Andrew. This is an Alpha version of the software (v1.0a) and may be downloaded from the SDRplay web page including the User Manual.
The current Devices supported are also listed on the SDRplay web page.
Field Day - Audio Interface Unit Project
- Details
- Written by: G Wolfe - KI0KK
The Santa Fe Trail Amateur Radio Club is undertaking a construction project to improve the Field Day and Special Event operating experience. This article will provide information on the our project without repeating the full source article. A link to the original article is provided at the end of this article.
Events such as WW1USA Special Event Station and Field Day can be a fun and yet challenging for operators, loggers and guests. The noisy surroundings and need to concentrate on the chaotic signals on the band requires the use of a headset by the operator. This leaves the logger or the guest with limited ability to hear the contacts. Communications between the operator and logger is also difficult. To solve this problem John Raydo K0IZ designed and published plans in a June 2008 QST article titled "An Audio Interface Unit for Field Day and Contesting".
The K0IZ Audio Interface Unit enhances headset operation by providing the following:
- Operator headphone interface to the radio
- Logger headphone access to the contact audio
- Intercom communications between the operator and logger
- A speaker for visitors to hear the contacts
- Provides individual level control for the operator and logger
- Supports three types of microphones; dynamic, electret and aviation
- Foot switch interface
A number of the components have been donated by Jeff Darby, Howard Cripe and Jim Andera. Joe Krout provide the circuit board that started the project and the the QST article. Howard has volunteered to 3D print the project, should be interesting to see the finished enclosure. The remaining parts will be ordered online and hopefully will be here in time to complete the project for the 2019 Field Day. This could be an interesting project for new hams or those interested in building projects to observe or participate in the assembly.
Source: QST June 2008
Author: John Raydo, K0IZ
Title: An Audio Interface Unit for Field Day and Contesting
Click the link above to view a copy of the full article.
The ARRL, QST, provided written permission to use article content (May 7, 2019).
Yaesu FT2DR Wires-X Features
- Details
- Written by: Greg Wolfe
Yaesu's FT2DR HT firmware update has added a new Wires-X feature. With the new firmware the FT-2 is able to plug into a computer and access any Wires-X room. Listening to the YouTube from Yaesu (link shown below) the wired connection to a USB port requires a Yaesu adapter cable to connect to the FT-2. Support for a wireless dongle on the USB port would have made this option a much more versitile?
https://www.youtube.com/watch?