ATT and ZZPA command behavior
Posted: Sun Apr 25, 2021 4:59 am
I'm trying to make sense of the ZZPA command and the ATT selector on Thetis.
AGC on Fixd
Using the selector
0dB = ZZPA1
-10dB = ZZPA2 = -140
-20dB = ZZPA0 = -130
-30dB = ZZPA8 = -120 yet ZZPA8; does nothing
If I look at the signal level for what the level is now.
ZZPA0 = -130
ZZPA1 = -150
ZZPA2 = -140 -- but ZZPA then reports ZZPA7;
ZZPA3 = -130
ZZPA4 = -120
ZZPA5 = -110
ZZPA6 = -100
ZZPA7 does nothing
All this looks very confusing. I'm trying to program FLRig's "PRE" button to adjust the ATT but it looks like it varies across rigs and I have no way to figure out which rig is talking. Besides the strange mapping here.
It also appears to me that select values are inverted -- ZZPA0 selects -20dB on the ATT pulldown and that does not sound like ATT is "off".
Mike W9MDB
AGC on Fixd
Using the selector
0dB = ZZPA1
-10dB = ZZPA2 = -140
-20dB = ZZPA0 = -130
-30dB = ZZPA8 = -120 yet ZZPA8; does nothing
If I look at the signal level for what the level is now.
ZZPA0 = -130
ZZPA1 = -150
ZZPA2 = -140 -- but ZZPA then reports ZZPA7;
ZZPA3 = -130
ZZPA4 = -120
ZZPA5 = -110
ZZPA6 = -100
ZZPA7 does nothing
All this looks very confusing. I'm trying to program FLRig's "PRE" button to adjust the ATT but it looks like it varies across rigs and I have no way to figure out which rig is talking. Besides the strange mapping here.
It also appears to me that select values are inverted -- ZZPA0 selects -20dB on the ATT pulldown and that does not sound like ATT is "off".
Mike W9MDB