Chirps -- Chirps list - passive study of HF propagation
About Chirps	English (USA) Spanish (Spain)
The purpose of this project is to explore the use of publicly available chirped ionospheric sounding transmissions (ionosondes) to study the ionosphere. These transmissions are made from most parts of the world, and cover the HF spectrum from about 3 to 30 MHz on a 24 hour basis. The unique aspect of this project is that it is wholly passive - it makes use of the sounding transmissions made by other agencies. This means that anyone can potentially receive and interpret the transmissions. Take a look at this page, before subscribing to see if you meet the basic hardware requirements. http://www.qsl.net/zl1bpu/chirp/chirps.html To see the collection of prior postings to the list, visit the Chirps Archives. (The current archive is only available to the list members.)
Using Chirps
To post a message to all the list members, send email to chirps@aintel.bi.ehu.es. You can subscribe to the list, or change your existing subscription, in the sections below.
Subscribing to Chirps
Subscribe to Chirps by filling out the following form. You will be sent email requesting confirmation, to prevent others from gratuitously subscribing you. Once confirmation is received, your request will be held for approval by the list moderator. You will be notified of the moderator's decision by email. This is also a hidden list, which means that the list of members is available only to the list administrator. Your email address:   Your name (optional):   You may enter a privacy password below. This provides only mild security, but should prevent others from messing with your subscription. Do not use a valuable password as it will occasionally be emailed back to you in cleartext. If you choose not to enter a password, one will be automatically generated for you, and it will be sent to you once you've confirmed your subscription. You can always request a mail-back of your password when you edit your personal options. Once a month, your password will be emailed to you as a reminder. Pick a password:   Reenter password to confirm:   Which language do you prefer to display your messages? English (USA) Spanish (Spain)   Would you like to receive list mail batched in a daily digest? No Yes
Chirps Subscribers
(The subscribers list is only available to the list administrator.) Enter your admin address and password to visit the subscribers list: Admin address: Password:    To unsubscribe from Chirps, get a password reminder, or change your subscription options enter your subscription email address: If you leave the field blank, you will be prompted for your email address