What program are you guys running for this mode??

 

Thanks

Fred

VE3FAL

 

-----Original Message-----
From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of Tony
Sent: Sunday, August 24, 2008 5:10 PM
To: digitalradio@yahoogroups.com
Subject: [digitalradio] Re: (formatted text) Path Simulations for PAX / HF
Packet

 

Greetings Patrick,

> Hello Tony, TKS for the interesting tests. Did you test PAX or PAX2? with 
> Unproto frames?
> 73 Patrick

I used PAX2 with Unproto frames during the test. Haven't figured out how to 
test in the 'connect' mode yet. I just finished testing PAX "1" so please 
see below. PAX has a definite advantage in sensitivity over PAX-2 as well as

the ability to print better when conditions are disturbed.

There's a 3db advantage in sensitivity over PAX-2 when the criteria is based

on 100% decode. But partial decodes at -6 and -10db vs. 0db and -2db would 
seem to indicated that PAX would do much better than PAX-2 in the ARQ 
connect mode.

Would appreciate your thoughts on this Patrick...

Tony, K2MO

________________________________________________________

PAX: Sensitivity threshold for 100% decode: -11db (no ionospheric
distortion) 

 

Ionospheric Simulations. 

 

High-Latitude Moderate.........Complete decdoe @ -4db SNR. Partial decode
-10db SNR
High-Latitude Disturbed........NO DECODE
Mid-latitude Disturbed.........Complete decode @ -4db SNR. Partial Decode @
-10db SNR
Low-Latitude Disturbed.........Complete decode @ -0db SNR. Partial decode @
-6db SNR

 

 

PAX2: 

 

Sensitivity threshold for 100% decode: -2db (no ionospheric distortion) 

 

Ionospheric Simulations. 

 

High-Latitude Moderate.........Complete decdoe @ +2db SNR. Partial decode
0db SNR
High-Latitude Disturbed........NO DECODE
Mid-latitude Disturbed.........Complete decode @ +1db SNR. Partial Decode @
-2db SNR
Low-Latitude Disturbed.........NO DECODE 

 


HFPAcket (300baud):

 

Sensitivity threshold for 100% decode: +1db SNR (no ionospheric distortion) 

 

Ionospheric Simulations. NO DECODE REGARDLESS OF SNR*

 

* Susceptible to slight multi-path timing delays (< 1msec) and Doppler
Spread (< 1Hz)

 

 

 

Reply via email to