Wednesday, September 29, 2010

The SDR Cube

I posted back in August (Tmate (what your SDR always wanted) I was told by several that SDR is not a popular thing here in the U.S. Looks like they maybe wrong.
While browsing around the ARRL web site I notice an article in which it mention SDR Dominating the 2010 ARRL/TAPR Digital Communications Conference.
While reading the article I was led to the web-page by George Heron, N2APB and Juha Niinikoski, OH2NLT, where they introduced the SDR Cube project.
This definitely looks cool to me.

For more on the SDR Cube;
click here
They also have a yahoo group;
click here

George N2APB and Juha OH2NLT have also added videos demonstrating the SDR Cube in action. The video segments include:- Overview- Tuning a CW station (two clips)- Tuning SSB stations- CW QSO with YL2QT- Tuning an RTTY station
These videos can be seen; click here
Posted by at
Labels: ,

High Efficiency Plate Caps for the Eimac 3-500Z Tubes

While chatting with some friends this morning, The topic came up in regards to aluminum plate caps. So this is what I was taught;
These Precision machined 6061 aluminum Plate Caps remove an incredible amount of heat from the plate pin of the Eimac 3-500Z tube as compared with the original style Plate Cap (Anode Cap for our friends in the UK). This gives the operator a comfortable margin of safety regarding the Plate Pin Seal Temperature when operating his amplifier at elevated continuous duty output.
These plate caps are not intended to increase the original ratings of the tube or amplifier, always use good engineering practices and follow the recommendations of the tube and amplifier manufacture when in use.






source
Posted by at
Labels: ,
Subscribe to: Posts (Atom)

My Stamp Collecting Blog

My Stamp Collecting Blog

Counter Added January 1, 2011

free counters

HOW TO READ PROPAGATION NUMBERS

The A index [ LOW is GOOD ]

  • 1 to 6 is BEST
  • 7 to 9 is OK
  • 11 or more is BAD

Represents the overall geomagnetic condition of the ionosphere ("Ap" if averaged from the Kp-Index) (an average of the eight 3-hour K-Indices) ('A' referring to amplitude) over a given 24 hour period, ranging (linearly) typically from 1-100 but theoretically up to 400.

A lower A-Index generally suggests better propagation on the 10, 12, 15, 17, & 20 Meter Bands; a low & steady Ap-Index generally suggest good propagation on the 30, 40, 60, 80, & 160 Meter Bands.

SFI index [ HIGH is GOOD ]

  • 70 NOT GOOD
  • 80 GOOD
  • 90 BETTER
  • 100+ BEST

The measure of total radio emissions from the sun at 10.7cm (2800 MHz), on a scale of 60 (no sunspots) to 300, generally corresponding to the sunspot level, but being too low in energy to cause ionization, not related to the ionization level of the Ionosphere.

Higher Solar Flux generally suggests better propagation on the 10, 12, 15, 17, & 20 Meter Bands; Solar Flux rarely affects the 30, 40, 60, 80, & 160 Meter Bands.

K index [ LOW is GOOD ]

  • 0 or 1 is BEST
  • 2 is OK
  • 3 or more is BAD
  • 5 is VERY VERY BAD

The overall geomagnetic condition of the ionosphere ("Kp" if averaged over the planet) over the past 3 hours, measured by 13 magnetometers between 46 & 63 degrees of latitude, and ranging quasi-logarithmically from 0-9. Designed to detect solar particle radiation by its magnetic effect. A higher K-index generally means worse HF conditions.

A lower K-Index generally suggests better propagation on the 10, 12, 15, 17, & 20 Meter Bands; a low & steady Kp-Index generally suggest good propagation on the 30, 40, 60, 80, & 160 Meter Bands.

Terms of Service

[In accordance with Title 17 U.S.C. Section 107, this material is distributed without profit, for research and/or educational purposes. This constitutes 'FAIR USE' of any such copyrighted material.]
I am not responsible for any thing that happens to your mental health, computer and all personal property because you visited my site.
This site is a collection of some things sent to me by e-mail, obtained from other blogs and the internet. If there is a picture or quote that is copyrighted to you let me know and I will remove your item .
Thoughts expressed in my blog are just that . I give My Opinion on the many events, products and how too, reported by the media and other web-sites.
Do not use this blog site to obtain weather events or disasters information. What I post may not be correct. Always get information from the proper media, weather (NWS)(NOAA)
Pacific Tsunami Warning Center and USGS sites