Hi EbNaut
Yesterday installed the PA and my intention was to transmit with the lowest possible power (about 24W at 12V in LOW mode)
but Murphy confirmed that the lowest possible power …..is always zero. Something went wrong
L
Anyway cound trim the antenna to resonance. It was a couple of KHz down. And using the mosfet driver at 14V
could see some improvements in output level and the device clearly heating. No Vrms meter available so I can’t
confirm the output power or current for this transmissions
Trying to check if there could be a decode at Domenico’s EbNaut decoder I transmitted all night
with the usual parameters for weak signal in a less than half an hour message. May be Stefan can
use the files he is recording and check for the transmission
f = 137485.000 Hz
Start time: 20.SEP.2018 19:00:00 UTC up to 05:30:00 UTC (message starting at minute 00 and 30 every hour)
Symbol period: 2s
Characters: 3
CRC bits: 19
Coding 16K21A
The message is “DOM”, so if anyone wants to correlate the received signal and get some extra dBs. This is extremely
weak signal. The input power to the antenna must be well under 1W, so the ERP must be very low
There was no decode at Domenico’s grabber
https://www.qsl.net/iz7slz/EBNAUT/DECODED.TXT
Just for measurement of signal I can run a permanent carrier tonight if this can help
73 de Luis
EA5DOM
