TRX IN
the transmitter (transceiver) is connected here. Maximum power 2 W, usual power up to 1 W.
ANT OUT
2.4 GHz output (max. 6 W) to the antenna (feed). Please ensure a VSWR of 1:1.5 or better.
REFIN 10/40
Input for an external (e.g. GPS stabilized) reference frequency. See also F1/F2 and E. The level on the part of AMSAT-DL DownConverter here is 1Vpp for 40 MHz, but also applies to 10 MHz. Note that the reference input is terminated with 50 ohms.
A
Connection for the 12 V supply voltage. A voltage between 9 and 15 V with a load capacity of approx. 3 A is required. For example, a common 13.8 V station supply can be used.
B
6-pin header with the following pin assignment:
C
Two jumpers to select the transmit frequency of the connected transceiver (transmitter):
transmit frequency of the trx | jumper 1 | jumper 2 |
430 MHz | open | open |
435 MHz | to | open |
830 MHz | open | to |
1290 MHz | to | to |
D
D1, D2 and D3 form an input attenuator. See “Input attenuator”.
E
Solder bridge to select reference frequency.
F
Solder bridge to select internal/external reference.
G
LEDs 1,2 and 3: