Darrin KE9NS did release P-SDR Version 2.8.0.149 supporting the MCP23017 I/O expander.
Big thanks great job!
Automatic bandpass selecting / hopping now also works for the "XVTR" bands 2200m and 630m.
The Flex1500 needs external Bandfilters for 137 / 475 kHz i.e. below 482kHz the bandfilter section is bypassed.
2200m and 630m are added as XVTR bands and use the BNC port XVTX/C for external bandfilters and antenna. in TX the output is about 0dBm over the XVTX/C port
The I2C flexwire is connected to MCP23017 I2C i/o expand band switching
The MCP23017 external slave address lines: A0=A1=1(Vcc) , A2=0
Then 474kHz /630m band GPIO A0=low A1=high = 3.2V
and 136kHz /2200m band A0=hi A1 =low
The GPIO are active high in on state so the circuit can be kept very simple.
Only output A0 is used
To switch the small relays of my dual bandfilter only an TUN o.c. is needed
GPIO A0 active high 3.2V 4k7k at the base of o.c. TUN to select band pass filter 2200m
MCP23017 Ali Express 0.95€ including shipping....
DCF39 near Magdeburg is direction East
The best signals i have on the west BeverageI
do not know why signals east of me at 137 kHz are stronger on the West Beverage.
Both West and East have the same length about 300m checked them several times no faults found.
The picture below shows the WSPR 200Hz window as a grey bar
137.400 -- 137.600 kHz
the high peak 80dB over noise is DCF39
Clearly there is some extra noise peak exactly within the WSPR window
i looks like one of the side bands IMD ? but that noise is only at night time
the window is clear during day when DCF39 is still about the same strength 70-80 dB / noise
I do not know the origin of this noise that reduces receiving s/n with 20dB
it sounds like fast FSK modulation
never the less i can receive here
last 2 weeks LF reception 136kHz USB dial WSPR
Big thanks great job!
Automatic bandpass selecting / hopping now also works for the "XVTR" bands 2200m and 630m.
The Flex1500 needs external Bandfilters for 137 / 475 kHz i.e. below 482kHz the bandfilter section is bypassed.
2200m and 630m are added as XVTR bands and use the BNC port XVTX/C for external bandfilters and antenna. in TX the output is about 0dBm over the XVTX/C port
The I2C flexwire is connected to MCP23017 I2C i/o expand band switching
The MCP23017 external slave address lines: A0=A1=1(Vcc) , A2=0
Then 474kHz /630m band GPIO A0=low A1=high = 3.2V
and 136kHz /2200m band A0=hi A1 =low
The GPIO are active high in on state so the circuit can be kept very simple.
Only output A0 is used
To switch the small relays of my dual bandfilter only an TUN o.c. is needed
GPIO A0 active high 3.2V 4k7k at the base of o.c. TUN to select band pass filter 2200m
MCP23017 Ali Express 0.95€ including shipping....
DCF39 near Magdeburg is direction East
The best signals i have on the west BeverageI
do not know why signals east of me at 137 kHz are stronger on the West Beverage.
Both West and East have the same length about 300m checked them several times no faults found.
The picture below shows the WSPR 200Hz window as a grey bar
137.400 -- 137.600 kHz
the high peak 80dB over noise is DCF39
Clearly there is some extra noise peak exactly within the WSPR window
i looks like one of the side bands IMD ? but that noise is only at night time
the window is clear during day when DCF39 is still about the same strength 70-80 dB / noise
I do not know the origin of this noise that reduces receiving s/n with 20dB
it sounds like fast FSK modulation
 |
| Night |
 |
| Day |
never the less i can receive here
last 2 weeks LF reception 136kHz USB dial WSPR
15 spots:
| Timestamp | Call | MHz | SNR | Drift | Grid | Pwr | Reporter | RGrid | km | az | # Spots |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2020-01-09 07:40 | K3RWR | 0.137527 | -29 | 0 | FM18qi | 1 | PA0O | JO33hg | 6279 | 45 | 1 |
| 2020-01-04 07:50 | K3MF | 0.137406 | -28 | 0 | FM19sr | 1 | PA0O | JO33hg | 6162 | 46 | 8 |
| 2020-01-04 07:08 | N1BUG | 0.137438 | -26 | 0 | FN55mf | 1 | PA0O | JO33hg | 5297 | 52 | 128 |
| 2020-01-04 19:08 | UA4AAV | 0.137522 | -22 | 0 | LO21 | 1 | PA0O | JO33hg | 2578 | 290 | 75 |
| 2020-01-14 23:34 | UA3DJG | 0.137572 | -18 | 0 | KO95 | 0.2 | PA0O | JO33hg | 2089 | 277 | 14 |
| 2020-01-08 22:30 | SV8CS | 0.137510 | -18 | 0 | KM07js | 0.1 | PA0O | JO33hg | 2038 | 332 | 1 |
| 2020-01-06 23:32 | EA5DOM | 0.137532 | -16 | 0 | IM98xn | 1 | PA0O | JO33hg | 1713 | 15 | 16 |
| 2020-01-04 19:12 | OE3EMC | 0.137441 | -27 | 1 | JN78jo | 0.001 | PA0O | JO33hg | 772 | 315 | 74 |
| 2020-01-04 22:20 | G8HUH | 0.137450 | -18 | 0 | IO81mg | 0.1 | PA0O | JO33hg | 688 | 67 | 24 |
| 2020-01-04 19:40 | 2E0ILY | 0.137550 | -2 | 0 | IO82qv | 0.5 | PA0O | JO33hg | 619 | 82 | 101 |
| 2020-01-06 05:56 | F4GUK | 0.137456 | -27 | 0 | JN18gt | 0.2 | PA0O | JO33hg | 572 | 28 | 2 |
| 2020-01-15 22:54 | LA3EQ | 0.137551 | -27 | 0 | JO28xj | 1 | PA0O | JO33hg | 571 | 176 | 1 |
| 2020-01-04 18:14 | DL7NN | 0.137440 | -6 | 0 | JO60it | 1 | PA0O | JO33hg | 498 | 306 | 356 |
| 2020-01-04 18:22 | G6AVK | 0.137582 | -22 | -1 | JO01ho | 0.05 | PA0O | JO33hg | 447 | 63 | 31 |
| 2020-01-07 00:06 | DC0DX | 0.137426 | -12 | 0 | JO31lk | 0.1 | PA0O | JO33hg | 205 | 354 | 44 |
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