From 03da349bcf1a00383c33bac7612c0285e95c862d Mon Sep 17 00:00:00 2001 From: c vw Date: Mon, 16 Aug 2021 15:18:04 +0200 Subject: [PATCH] Disable "IQ scaling" when doing PURESIGNAL --- old_protocol.c | 4 ++++ transmitter.c | 5 ++++- 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/old_protocol.c b/old_protocol.c index 0731aa6..f5b394d 100644 --- a/old_protocol.c +++ b/old_protocol.c @@ -1543,6 +1543,10 @@ void ozy_send_buffer() { // stronger than the "TUNE" signal, and in the case of very low drive slider // values they can be *much* stronger. // + // NOTE: When using predistortion (PURESIGNAL), the IQ scaling must be switched off. + // In this case, the output power can also be stronger than intended. + // + if (power > 0) { int hl2power = 15+(int)lround(ceil(40.0 * log10((double) power / 255.0))); if (hl2power < 0) hl2power=0; diff --git a/transmitter.c b/transmitter.c index 55dfae5..7e89244 100644 --- a/transmitter.c +++ b/transmitter.c @@ -1245,7 +1245,7 @@ static void full_tx_buffer(TRANSMITTER *tx) { gain=gain*(double)tx->drive_level*0.00392; } } - if (protocol == ORIGINAL_PROTOCOL && radio->device == DEVICE_HERMES_LITE2) { + if (protocol == ORIGINAL_PROTOCOL && radio->device == DEVICE_HERMES_LITE2 && !transmitter->puresignal) { // // The HermesLite2 is built around the AD9866 modem chip. The TX level can // be adjusted from 0.0 to -7.5 dB in 0.5 db steps, and these settings are @@ -1257,6 +1257,9 @@ static void full_tx_buffer(TRANSMITTER *tx) { // However, if the drive level requires an attenuation *much* larger than // 7.5 dB we have to damp significantly at this place, which may affect IMD. // + // NOTE: When doing adaptive pre-distortion (PURESIGNAL), IQ scaling cannot + // be used. + // int power; double f,g; if(tune && !tx->tune_use_drive) { -- 2.45.2