FT920 - data conector pinout
SCU-17 conector pinout (As viewed from rear panel, not from cable!)
AFSK mode
FT-920 pin 1 Data IN (Audio IN) SCU-17 pin 1 Data OUT (Audio OUT)
FT-920 pin 2 GND SCU-17 pin 2 GND
FT-920 pin 3 PTT SCU-17 pin 3 PTT
FT-920 pin 4 Data OUT (Audio OUT) SCU-17 pin 5 Data IN (Audio IN)
FT-920 pin 5 Busy SCU-17 pin 6 SQL IN (Busy)
Pin 1 (AFSK Input):
Connect this pin to your TNC’s “AFSK Out” or “Mic Audio” output line. The optimum input level is 30mV rms, and the input impedance is 3 k. Your TNC’s audio output level potentiometer will allow you to set the level to the optimum value. This pinmay be used either for 300 baud SSB-mode digital operation or for 1200-baud FM packet. The bandwidth and frequency response are not, however, suitable for 9600 baud operation. Be sure the AFSK-FSK switch on the rear panel is in the AFSK position. For FSK operation (whereby the TNC closes a line to ground to accomplish teletype keying), set the AFSK-FSK switch to FSK, and connect your
TNC’s FSK keying line to Pin 1.
Pin 2 (Ground):
Connect this to the shield(s) of the cable(s) used for connections between the TNC and the FT-920.
Pin 3 (PTT):
Connect this pin to the PTT line from the TNC. This pin, when grounded by the TNC, places the FT-920 into the Transmit condition.
Pin 4 (Audio Out):
Connect this pin to your TNC’s “RX Audio” input line. This is a constant-level (100 mV rms @ 600) audio output line which is not affected by the position of the front-panel AF GAIN control.
Pin 5 (BUSY):
This is a “Squelch Status” pin not generally required for digital mode operation. This pin is held at +5V when the squelch is open, and is grounded when the receiver is muted by the squelch (“nosignal” condition).
FT920 Menu settings (dont forget - USB-DATA mode)
Menu # Description Value for WSPR/FT4/FT8/RTTY
U-45 Packet Freq. Display Offset 0000
U-46 Packet Subcarrier Frequency 2125U
Please note, those values are available for regular rtty tones (2295/2125).
My first adventure with the eggbeater antenna took place 1 year ago when I made this antenna for 137Mhz weather satellites.
Few months ago I tried to listen the satellites trasmitting on 2 m band. So, I modified the old antenna for new frequency, this time using a Rig Expert AA230 for final testing.
I was inspired from documentation writen by ON6WG/F5VIF (you can download from his website, https://on6wg.pagesperso-orange.fr/Page%201.html).
For building the loops I used flat aluminium (15 x 2 mm), you can find in bricolaje store at 2.6 meters lenght. The circumference of the loops is 212 cm. For mounting, I used 50 mm pvc water pipes and textolit.
The ground reflector was made with 8mm aluminium rods, 4 pcs x 53 cm lenght, conected in center and mounted at 27 cm under loops.
The most important job was the feeding harness. I used the ON6WG recommendation (https://on6wg.pagesperso-orange.fr/Doc/Appendix%20A%20-%20English.pdf)
You can find on page 3 all the formulas you need to calculate all the dimensions. I used RG58, because is very hard to insert H1000 or other low loss cables into 50 mm pvc pipe.
So, nothing new. What can I add to ON6WG work are the AA230 tests.
