8 band decoder

[pa2mrx]

Hi,

Recently I installed a 8 band decoder+ switch.
(upgrading to portsdown 2019)
Connected 8 leds to the board to see what`s going on.
The 71/146/432/1296 are going on when choose corrsponding freq.
But what about 2400 and the transverter leds.
I already changed setting in menu 3, band details. (enter express&lime port settings)
1 for 71, 2 for 144, 3 for 432, 4 for 1296, 5 for 2400, so on.

But 2400Mhz lights up on LED 4 (1296)

How do I get these last 4 LEDS work at the correct frequency?
I`m using the latest software.

Hope someone has an answer or a link to good expanation on the net how to setup the software.

73 /thanks
Frank

[G8GKQ]

Hi Frank

My apologies, I struggled to explain this properly on the Wiki.

To answer your question directly, if you set the express&lime port setting for 13 cm to 20 (=15+5) it will set the output to port 5 for that band.

This is because any setting between 16 and 23 overides the band switching and sets the switching lines directly. The code that does this is fairly easy to understand here: https://github.com/BritishAmateurTelevi ... er.sh#L129. The reason that it does it like this is to maintain compatibility with the 4-band switch and previous hardware builds.

Please let me know if this works

Dave, G8GKQ

[pa2mrx]

Hi Dave,

Thanks for an answer.

I changed some data in menu 3, band details.
But:
13cm port setting to 20, LED 1 goes on (71)
9cm port setting to 21, LED 2 goes on (146)
6cm port setting to 22, LED 3 goes on (436)
3cm port setting to 23, LED 4 goes on. (1296)

Trying 020, last digit goes red.

71 to 1296 works OK, LED 1-4 goes on.

73
Frank

[G8GKQ]

Hi Frank

I am puzzled, because I have just tested it here and it works for me. It does need to be 20, not 020 or 2O, as it checks the characters, not the numerical value.

Please could you check the voltage on the Raspberry Pi GPIO Pin 7 (which should be wired to J1 pin 5 on the 8-way switch decoder) when you have 13 cm selected and a port setting of 20? This line should go high (3v3) when you select 13 cm, and the other 2 lines should go low.

If that line voltage is OK, please check the function of your 8-way decoder PCB without the Raspberry Pi. You can do this by putting switches (with pull up to 3v3 or pull down resistors, as required) on the 3 input lines LSB, MSB and T on J1 as shown here: https://wiki.batc.org.uk/images/6/66/8_ ... -0_SCH.pdf. This is how I test all the PICs for the BATC shop after programming them.

73

Dave

[pa2mrx]

Dave,

I`ll check it this weekend.
Be back.

thanks
Frank

[pa2mrx]

Dave,

Got home very early today from QRL,

As I thought, user error.

Bad contact of transverter line to digithin connector, but then my LED 7 did not work, wires to decoder board all OK,...but
the wires to led soldered wrong way around. (only this LED).

All signals go hi/low from the breakout box to all boards, including to LO filter board.

Wiring goes on to put it back together with all outputs at the back

Thanks
Frank

[on5nv]

Hi ,

I have a problem with the output from pin 28 on the raspberry pi LSB , it is always 3.3v , MSB and Pin 7 seems to be ok.
The express & lime portsettings in the Portsdown 4 are 4m 0 , 2m 1 , 70cm 2 , 23cm 3 , 9cm 4 , 6cm 5 , 3cm 6 ,1.2cm 7 , 13cm 20 .

I checked the 8 band decode board disconected from the GPIO breakout board i use , and with te combinations of the 3 inputs ( LSB , MSB , T) i coud switch every of the 8 outputs on the 8 band decode board manualy .

I bypased the GPIO breakout board and mesured on pin 28 of the raspberry pi directly but the same result.


73's
Alex
ON5NV