More precisely, step 1 is not usually a call to anybody, it is a call to either
a single station (call) or group of stations (netcall), i.e. B THIS IS A.
There is also any anycall (CQ) and a special anycall (sounding).
In terms of there being a lightweight implementation I'd suggest that
anycalls/soundings are not necessary, nor even netcalls, and perhaps not even
desirable. But it would be nice to set up a sked with one other person and
within a minute or so find that person on any band that is open.
Scott
--- In digitalradio@yahoogroups.com, Patrick Lindecker f6...@... wrote:
Hello Andy,
My interpretation of this mail is the following:
If the heart of the ALE is the following handshaking protocol:
* Sounding (the Ham sends his/her call sign): THIS IS A,
* Response of the other Ham (by sending his/her call sign): A TO B,
* Acknowledgment of the first Ham: B TO A
I supposed that the equivalent with CALL ID (RS ID extension) would be:
1) CALL ID to anybody: THIS IS A
2) Response of the other Ham (by sending his/her call sign): A TO B,
3) Acknowledgment of the first Ham: B TO A
2) and 3) are not possible with the present CALL ID.
73
Patrick
- Original Message -
From: Andrew O'Brien
To: digitalradio@yahoogroups.com
Sent: Saturday, July 25, 2009 2:21 PM
Subject: [digitalradio] Hop, skip and jump away ... powerful, ALE
implementation that would outperform MIL-STD-188-141A ?
Regarding this message below, from the RS-ID thread, can someone elaborate
? What lightweight ALE implementation ?
Andy K3UK
You know what's really exciting? We are a hop, skip and jump away from a
powerful, lightweight ALE implementation that would probably outperform
MIL-STD-188-141A by a large margin.
Right now the code scans an entire 3KHz bandwidth for RSID (or more with
SDR). When you add in the future, planned SELCAL feature the only things
missing after that are scanning and an automated response.
It also appears possible that the software would be capable of
automatically choosing an empty spot on the waterfall to make the call. This
would allow all calls to occur simultaneously and therefore I would suggest
time synchronized scanning a la JT65 or WSPR in order to improve probability
of intercept without long or repetitive RSID transmissions. Say 4 second
dwell per band to allow a +/-1 second guard band on the timing (given a 2
second RSID transmission length). The occasional collision would be worth the
simplicity and reliability.
--
Andy
