Our featured article in the Summer edition is the first of a series entitled "Reception Filters: Sorting Out the Crowd." This installment looks at the development of bandwidth filters up to the superheterodyne receiver and the advent of SSB. Future installments will cover mechanical & ceramic filters, DSP, and Software Defined Radio. Other articles in this month's edition include:
Into the Air: Make Your Own Antenna Hanging Slingshot
Building a Simple Studio Microphone/PTT Interface
The Venerable VTVM
The Careless Consumer
Guest Editorial--Too Many Options
Member Musings--Getting Into HF
The HamTech Team is pleased to bring you this new format, and is working on an exciting new selection of articles for each new issue. Click on any of the Magazine menus to read what is online now!
The K7RA Solar Update
Written by Tad Cook, K7RA
Friday, 07 March 2008
Following five days of no sunspots, we saw one (number 984) on March 5
and 6, but it is fading off the west limb of the Earth-facing portion
of the Sun. Solar activity is still very low. Sunspot numbers for
February 28-March 5 were 12, 0, 0, 0, 0, 0 and 13 with a mean of 3.6.
The 10.7 cm flux was 70, 69.8, 68.6, 69.2, 68.4, 68.3 and 69.3 with a
mean of 69.1. Estimated planetary A indices were 22, 27, 19, 8, 5, 4
and 8 with a mean of 13.3. Estimated mid-latitude A indices were 17,
18, 13, 8, 4, 3 and 7, with a mean of 10.
Last week we reported, in error, that an opening on 6 meters extended to VP6DX. The openings were actually on 10 meters.
Last week saw a geomagnetic disturbance on February 28 and 29
caused by solar wind streams from a coronal hole. The far north saw
dramatic aurora displays, and the planetary A index on the last two
days of the month were 22 and 27.
Global Conditions 2240 07 Aug 2008 Global HF Propagation Conditions for 2200Z on 07 Aug, 2008
Low Latitude: Normal
Mid Latitude: Normal
Hi Latitude: Normal
Server News: May 15, 2008 Good news: We have finally moved HFRadio.org over to the new server! This is much more secure, faster, and all around better. Now,...
DX Spots
DX Cluster Spots by WorldIRC #CQDX Channel. Provided by OH2AQ DX Summit
To prevent abuse of the site, many features are available only to registered users. These include:
View and Post in all forums
Personal Profile page includes management of a Bio Page and picture, all your forum posts, classified ads, and other information
Post comments to articles
View all classified ads and add your own
See all categories of product reviews and write your own reviews
Read content and articles visible only to registered users
Registration is free, and gives access to all of the above mentioned features. Join today and enjoy building all of the resources that HamTechTalk has to offer.
Articles Needed!
Everyone has something that they are really good at—and have acquired a special knowledge of tips, tricks, and theory to achieve their goals.The real beauty of ham radio is our willingness to share information with each other.Much of the practical work that we do with our equipment is particular to a specific need.By making available what we know to other hams, we are making sure that good operators find satisfaction and better practice in the hobby.
HamTechTalk’s main goal is to provide a place to share that knowledge.We need your articles and photos to make this happen!Do you have a radio project that you are particularly proud of?A modification or repair to any equipment or antenna system?Anything of interest to hams is requested—how to engage in practice, theory, and betterment of the Amateur Radio Service.
Submitting an article for consideration is easy.Write what you are interested in, using any contemporary word processor.Photos, charts, tables, and schematics are requested whenever possible.Don’t worry about scaling down the pictures, or inserting them in your word processor document.Our editors will set everything up to match our website requirements.
Here are the steps to submit an article:
Write and save your text.
Make any photos or scan schematics into JPG, TIF, or BMP format.We can work with Photoshop PSD as well.
Attach your word processor file, and the graphics to an email and send to:
This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
Be sure to include your name as you wish to see it in print, your call sign if you have one, and a daytime telephone number in case we have any questions.
We will make every effort to find placement for every submission—some items may be consolidated into a “Tips & Tricks” review.Articles may also include something special that your club has accomplished, or any major events that may be occurring.Looking forward to your submissions, because through you our site grows!
Our featured article in the Summer edition is the first of a series entitled "Reception Filters: Sorting Out the Crowd." This installment looks at the development of bandwidth filters up to the superheterodyne receiver and the advent of SSB. Future installments will cover mechanical & ceramic filters, DSP, and Software Defined Radio. Other articles in this month's edition include:
Following five days of no sunspots, we saw one (number 984) on March 5
and 6, but it is fading off the west limb of the Earth-facing portion
of the Sun. Solar activity is still very low. Sunspot numbers for
February 28-March 5 were 12, 0, 0, 0, 0, 0 and 13 with a mean of 3.6.
The 10.7 cm flux was 70, 69.8, 68.6, 69.2, 68.4, 68.3 and 69.3 with a
mean of 69.1. Estimated planetary A indices were 22, 27, 19, 8, 5, 4
and 8 with a mean of 13.3. Estimated mid-latitude A indices were 17,
18, 13, 8, 4, 3 and 7, with a mean of 10.
