SQ Lab Transverter 1296MHz sequence timings

Some tests taken today. NOTE: tests were made with jumper 4 ON (rf vox activated)! NOTE2: RF OUT signal is taken from FWD pin of swr connector.

1.7ms from PTT in via coax to PTT out in 3.5mm jack socket

26ms from PTTout to RF signal at output

450ms from end of PTT signal at coax input to end of PTTout signal at 3.5mm jack

U-blox7 UBX Checksum in Python

def ubx_checksum(packet_data):
    ck_a = 0
    ck_b = 0
    for i in packet_data[2::]:
        ck_a = (ck_a + i) & 0xff
        ck_b = (ck_b + ck_a) &0xff
    return (ck_a, ck_b)

 Usage:

packet_data = [0xB5, 0x62, 0x06, 0x04, 0x04, 0x00, 0x00, 0x00,0x08, 0x00]
print "0x%x, 0x%x" % ubx_checksum(packet_data)

Result:

 0x16, 0x74