[hpsdr] Angelia_v1.7 firmware

[f6bki at orange.fr]

Hi Joe, YES , you are right , the new firmware is not causing the ADC 
overload I had on 6M.
The PowerSDR version I was runing did not offer this option to change 
Attenuation value during TX.

Regarding the space bar , I understand how it works , very often during 
TX/RX I am probably too slow pressing the bar and I can ear the relays , 
this I do not like very much !!
It is a minor issue , I have to pay attention myself.

Thank you very much, You and Doug in solving this ADC overload problem . I 
am very very please with the radio.

73
Jacques  F6BKI


-----Message d'origine----- 
From: Joe Martin K5SO
Sent: Thursday, May 09, 2013 11:13 PM
To: f6bki at orange.frf6bki@orange.fr
Cc: hpsdr at lists.openhpsdr.org
Subject: Re: [hpsdr] Angelia_v1.7 firmware

Hi Jacques,

I have rechecked Angelia/Alex automatic-mode switching on 6m using 
Angelia_v1.7 and my barefoot Angelia board and do not find any problem 
there; the firmware behaves as intended.

If the ADC warning comes on when you Tx on 6m there is clearly an excess of 
signal at the input of the Angelia board.  Here, I do not observe a problem 
with “Overload” warnings.  Indeed, the “Overload” warning comes on in my 
tests on 6m when the input signal to the Rx antenna input on Alex is 
at -30dBm or above, as expected as the the 6m preamp in Alex provides 20 dB 
of amplification, thus the overload point is 20 dB more sensitive (i.e., -30 
dB) than the usual -10 dBm level that triggers overload when operating on 
the HF bands.  This condition may be compensated for easily though by making 
appropriate configuration settings in mRx PowerSDR, as I indicate below. 
Unfortunately, I do not have an ANAN-100D unit here to try to duplicate your 
observations but from your descriptions and my tests I don’t believe there 
is a problem with your hardware or the new firmware.  As far as I can tell 
the Angelia_v1.7 firmware is working properly.

Here are my suggestions for you:

1) To address your ADC overload condition on 6m I recommend that you go to 
the setup menu in mRX PowersSDR,  Setup > General > Ant/Filters, and check 
the “ATT on Tx” box and set “31” into the ATT window.  That will insert 31 
dB of attenuation on your receiver when you are in Tx mode.

2)  The space bar keyboard control for Tx is supposed to be momentarily 
pressed then released to switch from Tx to Rx and vice versa, once for each 
transition.  If you hold the space bar down then of course the keyboard will 
keep repeating space bar characters to the PC which in turn will key and 
unkey your radio repeatedly.  Don’t hold the space bar down; only 
momentarily press it to activate Tx mode then momentarily press it again to 
switch back to Rx.

If you set your PowerSDR program up as in 1) above and you still have the 
ADC overload condition occuring on transmit then you have an excess amount 
of rf leakage into your receiver from your transmitter, the PA,  or directly 
from the Tx antenna.  That’s not a problem with the firmware, it’s a problem 
with your cabling or the hardware.

Thanks for the feedback.  I wish you good luck in setting up your system to 
your satisfaction.

73,  Joe K5SO 


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