-T flag does not enable bias-t on RSP1A

[Taubin]

I am running the software on a Raspberry pi 4. The software works properly, however the -T flag does not turn on the bias-t when used.

rsp_tcp version 1.0

libmirsdrapi-rsp version 2.13 found
mir_sdr_usb_GetDevices Dev0:vid=1df7 pid=3000 rev=0207 serno=190310A796 bus=001 port=004 devAvail=1
mir_sdr_usb_SetDeviceIdx idx=0 numDevices=1
Opened device with idVendor = 0x1df7 idProduct = 0x3000 fwVersion = 0x0207 busNum = 001 portNum = 004
mir_sdr_Init: starting hardware initialization
mir_sdr_Init: gR=60dB fs=2.000MHz rf=98.800MHz bw=1.536MHz if=0.000MHz
DownConvert: Enable=0 DecM=1 OutScale=0 (fs=2.000000 bw=1536 if=0)
initState: numActivePackets=4
mir_sdr_usb_USB DLL: Revision 0.1.1
mir_sdr_2500_Init: fnaddr = 2 detected, trying to change...
mir_sdr_2500_Init: fnaddr = 2
mir_sdr_2500_Init: adjusting squelch trim 0x1, rx gating enable 1, tx_trim 0, reg2 = 0x4801
initHw: Register7 = 0x000014
initRfFreqDependentHw(1): Tuner Register0 = 0x04f420
mir_sdr_GpioExtWrite: Addr=18 Data=0xe4
mir_sdr_GpioExtWrite: Addr=19 Data=0xff
mir_sdr_GpioExtWrite: Addr=0 Data=0x00
mir_sdr_GpioExtWrite: Addr=1 Data=0x00
mir_sdr_SetFs: Sample Freq requested 2000000.000000
mir_sdr_SetFs: Fs->FsNomHz+dFsHz=2000000.0+0.0Hz=2000000.0Hz FsToggle->1
mir_sdr_SetRf: f->98799999.901Hz (int=20 frac=aef afc=fff) fSynth:3161599996.838
mir_sdr_SetRf: Rf->RfNomHz+dRfHz+LifHz+Lif1Hz=98800000.0+0.0+0.0Hz+0.0Hz=98799999.9Hz RfToggle->1
mir_sdr_SetGr: GR->60[36,24,0,0] gRset->0x224 DCCALmode=3 DCCALspd=0 GrToggle->1
No offset diff1=0x000000fc diff2=0x000000fc
No offset samp1=0x0000285e samp2=0x0000295a samp2=0x00002a56
bufOffset=0
setToggleStates: initialising sampNum=0x00017a02, gainSetting=0x224, FsToggle=1, RfToggle=0, GrToggle=1
setToggleStates: initialising Fs=2000000.000, Rf=98799999.901, Gr=60
**mir_sdr_rsp1a_BiasT: enable = 0**
mir_sdr_GpioExtWrite: Addr=19 Data=0xff
mir_sdr_2500_Readback001Trim: readback = 0xe41ee10
mir_sdr_2500_Bypass001Trim: reg13=0x20d reg14=0x703aee
detected RSP model 'RSP 1A' (hw ver 255)
mir_sdr_DCoffsetIQimbalanceControl: DC:1 IQ:1
mir_sdr_DecimateControl: 0 1 0
mir_sdr_DecimateControl: DecimateEnable=0, DecimateDecM=1, DecimateOutScale=0, DecimateRound[0]=0x00000000, DecimateRound[1]=0x00000000
listening...
^CSignal (2) caught, ask for exit!
mir_sdr_StreamUninit()
mir_sdr_usb_ReleaseDeviceIdx 0
bye!

[Taubin]

Command run

rsp_tcp -T -E -v -a 192.168.0.50 -p 9090

[alphafox02]

Was this ever resolved? I’m wanting to try the rsp1a with SDRReceiver via the rsp_tcp connection but I need to be able to activate the bias T.

[Taubin]

Mine is currently on loan to someone else so I cannot test unfortunately. As far as I'm aware though, it's not been fixed.

[alphafox02]

Thanks for the heads up. I’m trying to use it with SDRReceiver (can connect to rtltcp) to feed Jaero, but I need the ability to turn on the bias T for my l band antenna. So far I’m not picking anything up, although I can with the rtlsdr which presumably has the working bias t.

[SDRplay]

I'm not sure -T has ever been tested or used - that's probably a hangover from the RTL command set. If you just use -E and then toggle the Bias-T in the ExtIO control panel, the Bias-T works fine.

[SDRplay]

In fact, I've just looked at it a bit more and if you use both -E and -T together, you see the Bias-T start to come up and then the control panel setting overrides the -T and so if the Bias-T in the control panel is off, you see the voltage drop to 0 V and if the Bias-T in the control panel is on, the voltage stays at 4.7 V - so I would recommend just using -E and the Bias-T will get set from the control panel.

[alphafox02]

Thank you, for the control panel though - is this something that can be run in Linux? I’ll have to go take a look if so.

[SDRplay]

The control panel is only provided as a Windows interface (to applications like HDSDR) - what client are you using on Linux? Unless you're using a client that has been written specifically for the RSP extensions, then setting -E on the server will not work. If you can let me know your setup, I'll try to replicate what you are seeing.