Transmit 7.5 MHz center frequency

I am attempting to transmit on a 7.5 MHz center frequency ( fc ). I want 3 MHz bandwidth so the frequency will modulate between 6 MHz and 9 MHz.

The slowest speed for the SXT VCO is 30 MHz. This is above my desired 7.5 frequency. Here is the slowest VCO wave form. It is 33.3ns at 2.0-volt scale.

The NOC (TxTSP FCW) is capable of the 7.5 speed, but its output is mixed with VOC LO in the RF front end. This creates the wave form seen below. It is combination of 30 and 7.5, and the signal has been attenuated to 40-millivolts scale. This is not the form I want.

Dr. Webster tells us to get frequencies below 30 MHz to use interpolation. He states a combination of upsampling and filtering will get my desired results. I have selected upconvert CMIX on the TxTSP tab. I also set the GFIRs as a low-pass filter for 9 MHz on this same tab. I am unsure if upconvert is the same as upsampling .

I started with the example.ini file provided with Lime Suite GUI. I changed the VOC, NOC and GFIRs as stated a above. I have saved the configuration and uploaded for review. Please explain to me how to get the desired FMCW signal that I desire.

attempt75.ini

Hardware: LimeSDR-USB revision 1.4s.

You don’t say anywhere what hardware you are using and if you could please clarify.

Sorry about that. I am using the LimeSDR-USB.

Andrew, have you made any progress on determine how to configure the LimeSDR-USB?

Sorry for the delay. @Zack, could you take a look, please.

Hi @clarkebowers,

Do you use LimeSuiteGUI for configuration?

Yes. I am using Lime Suite GUI. I put a link to my INI file in this thread. See above.

@Zack;

Haver you had any luck getting a 7.5 center frequency?

@andrewback, I have not heard anything from @Zack. Is there any progress?

You might want to check the ITU , FCC or other regulatory authorities in your region before they visit you.

@Grimmace, that is not a helpful comment.

Well if you keep it up you’re going to attract attention you do not want. You cannot just make all that noise there! In the US you can be fined up to $25,000 . So you’re welcome. Find some frequency you can USE LEGALLY! Trust me that is not where you should be operating AND CAUSING HARMFUL INTERFERENCE!!!

KD9POE

@Grimmance, I have no antenna attached to the SDR. I am using the loop back. I have no intension of utilizing the dielectric medium of air. That is the only thing the FCC regulates. Please spend your time with you Ham Radio buddies on shortwave instead of this BBS.

I’m not trying to get into a pissing match but you are wrong about several things. To “transmit” is to send signals in the air. Signals can get in to the air even without an antenna depending on shielding and decoupling being neglected. The Federal Communications Commission regulates radio, telephone and Internet. If you are transmitting as you say you cannot do that there. Clearly you are not licensed because you are crossing commercial and amateur bands as well as using more bandwidth than anyone is allowed in those frequencies except possibly FCC Part 15 devices. You may be surprised to know that 1.2 watts the Lime can produce at those frequencies can potentially travel hundreds of miles. Further there are volunteer teams that WILL hunt you down and warn and or report you to the FCC. Willfully continuing constitutes multiple crimes in the USA. So get your story straight if you continue to transmit as you have described. It really depends on if you cause interference but what you described is exactly that. Best wishes.

Grimmace,
where are You find the LimeSDR can made 1.2w output ?

Hi @clarkebowers,

Try this ini file:

[file_info]
type=lms7002m_minimal_config
version=1
[lms7002_registers_a]
0x0020=0xFFD5
0x0021=0x0E9F
0x0022=0x0FFF
0x0023=0x5550
0x0024=0xE4E4
0x0025=0x0101
0x0026=0x0101
0x0027=0xE4E4
0x0028=0x0101
0x0029=0x0101
0x002A=0x0086
0x002B=0x0032
0x002C=0x0100
0x002D=0x0641
0x002E=0x0000
0x002F=0x3841
0x0081=0x0001
0x0082=0x800B
0x0084=0x0400
0x0085=0x0001
0x0086=0x4101
0x0087=0x0000
0x0088=0x04D2
0x0089=0x0070
0x008A=0x0514
0x008B=0x2154
0x008C=0x267B
0x0092=0x0001
0x0093=0x0000
0x0094=0x0000
0x0095=0x0000
0x0096=0x0000
0x0097=0x0000
0x0098=0x0000
0x0099=0x6565
0x009A=0x658C
0x009B=0x6565
0x009C=0x658C
0x009D=0x6565
0x009E=0x658C
0x009F=0x658C
0x00A0=0x6565
0x00A1=0x6565
0x00A2=0x6565
0x00A3=0x6565
0x00A4=0x6565
0x00A5=0x6565
0x00A6=0x000F
0x00A7=0x6565
0x00A8=0x0000
0x00A9=0x8000
0x00AA=0x0000
0x00AB=0x0040
0x00AC=0x2000
0x00AD=0x03FF
0x00AE=0x0000
0x0100=0x3409
0x0101=0x7C62
0x0102=0x3180
0x0103=0x0A12
0x0104=0x0088
0x0105=0x0007
0x0106=0x318C
0x0107=0x318C
0x0108=0x158C
0x0109=0x00C1
0x010A=0x1F4C
0x010B=0x0001
0x010C=0x8865
0x010D=0x011A
0x010E=0x0000
0x010F=0x3142
0x0110=0x2B14
0x0111=0x0000
0x0112=0x000C
0x0113=0x03C2
0x0114=0x01F0
0x0115=0x000D
0x0116=0x8180
0x0117=0x280C
0x0118=0x418C
0x0119=0x5292
0x011A=0x3001
0x011C=0x8941
0x011D=0x0000
0x011E=0x0984
0x011F=0x3640
0x0120=0xE6C0
0x0121=0x3638
0x0122=0x0514
0x0123=0x200F
0x0124=0x0013
0x0125=0x9400
0x0126=0x12FF
0x0200=0x00E1
0x0201=0x07FF
0x0202=0x07FF
0x0203=0x2000
0x0204=0x0800
0x0205=0x0000
0x0206=0x0000
0x0207=0x0000
0x0208=0x607B
0x0209=0x0000
0x020A=0x0080
0x020B=0x4000
0x020C=0x8000
0x0240=0x0020
0x0241=0x0000
0x0242=0x4800
0x0243=0x0000
0x0244=0x0000
0x0245=0x0000
0x0246=0x0000
0x0247=0x0000
0x0248=0x0000
0x0249=0x0000
0x024A=0x0000
0x024B=0x0000
0x024C=0x0000
0x024D=0x0000
0x024E=0x0000
0x024F=0x0000
0x0250=0x0000
0x0251=0x0000
0x0252=0x0000
0x0253=0x0000
0x0254=0x0000
0x0255=0x0000
0x0256=0x0000
0x0257=0x0000
0x0258=0x0000
0x0259=0x0000
0x025A=0x0000
0x025B=0x0000
0x025C=0x0000
0x025D=0x0000
0x025E=0x0000
0x025F=0x0000
0x0260=0x0000
0x0261=0x0000
0x0280=0x36EE
0x0281=0x6D93
0x0282=0x17A9
0x0283=0x08D4
0x0284=0x627A
0x0285=0x884E
0x0286=0x569D
0x0287=0x54E3
0x0288=0xD6A0
0x0289=0x59AF
0x028A=0x90E2
0x028B=0x3783
0x028C=0xCE00
0x028D=0xE21A
0x028E=0xA09C
0x028F=0x456F
0x0290=0x59A6
0x0291=0xA36F
0x0292=0x9810
0x0293=0x6282
0x0294=0x2654
0x0295=0x8130
0x0296=0xC024
0x0297=0xE1C1
0x0298=0xD718
0x0299=0x8755
0x029A=0x12A4
0x029B=0x3173
0x029C=0x98D0
0x029D=0x2BD7
0x029E=0x5201
0x029F=0x7EFF
0x02A0=0x6C10
0x02A1=0x1FCF
0x02A2=0x4D86
0x02A3=0xF020
0x02A4=0x4C19
0x02A5=0x2B45
0x02A6=0x1533
0x02A7=0xB103
0x02C0=0x02DD
0x02C1=0x997A
0x02C2=0xD78A
0x02C3=0xD3B5
0x02C4=0x1BA6
0x02C5=0xD6F9
0x02C6=0xEE00
0x02C7=0x4B64
0x02C8=0x65B0
0x02C9=0x66E5
0x02CA=0x0912
0x02CB=0xCB8D
0x02CC=0x6083
0x02CD=0x9455
0x02CE=0x2D2B
0x02CF=0x0F3A
0x02D0=0x615E
0x02D1=0x7F85
0x02D2=0xAF7C
0x02D3=0x6A7F
0x02D4=0x8762
0x02D5=0xF000
0x02D6=0x1160
0x02D7=0x4C61
0x02D8=0x0E44
0x02D9=0x1096
0x02DA=0x0085
0x02DB=0x45D9
0x02DC=0xD623
0x02DD=0x3645
0x02DE=0xD178
0x02DF=0xED7B
0x02E0=0x4284
0x02E1=0x28C4
0x02E2=0xA22B
0x02E3=0xBFB0
0x02E4=0x0464
0x02E5=0xEFB8
0x02E6=0x11C7
0x02E7=0x6132
0x0300=0xB521
0x0301=0xBAAB
0x0302=0xED3C
0x0303=0xF64D
0x0304=0xDB30
0x0305=0x7912
0x0306=0x52A3
0x0307=0xDD0C
0x0308=0x388F
0x0309=0x3676
0x030A=0x058E
0x030B=0x9A4A
0x030C=0xF523
0x030D=0xC27A
0x030E=0xE62B
0x030F=0xB342
0x0310=0xAC9E
0x0311=0x11CA
0x0312=0x4486
0x0313=0x62B7
0x0314=0x0E08
0x0315=0x8838
0x0316=0x9E50
0x0317=0x6EA9
0x0318=0xA57B
0x0319=0x0799
0x031A=0x1A16
0x031B=0xC69B
0x031C=0x6135
0x031D=0x848E
0x031E=0x757B
0x031F=0xD778
0x0320=0x45A7
0x0321=0xBFAC
0x0322=0xCD47
0x0323=0xC4B7
0x0324=0xF786
0x0325=0x3F3A
0x0326=0x42C6
0x0327=0x46D2
0x0340=0x91EA
0x0341=0x547E
0x0342=0xF02F
0x0343=0x648D
0x0344=0x7352
0x0345=0x364D
0x0346=0x74C8
0x0347=0x9F16
0x0348=0xF241
0x0349=0x8411
0x034A=0x9991
0x034B=0xCA0A
0x034C=0x4E5B
0x034D=0x3668
0x034E=0x0BDE
0x034F=0x1E43
0x0350=0xE2F1
0x0351=0x8BDC
0x0352=0x791B
0x0353=0xD9B5
0x0354=0xBF62
0x0355=0x1B84
0x0356=0x75E0
0x0357=0x47DC
0x0358=0x6626
0x0359=0xEA4D
0x035A=0xDCDF
0x035B=0xA720
0x035C=0x698E
0x035D=0x452D
0x035E=0x1ACD
0x035F=0xF076
0x0360=0x80C9
0x0361=0x2436
0x0362=0x1251
0x0363=0x60CF
0x0364=0x223E
0x0365=0x743D
0x0366=0x1BED
0x0367=0xC968
0x0380=0xB67E
0x0381=0xE008
0x0382=0x1D55
0x0383=0x8236
0x0384=0x0439
0x0385=0x2AEC
0x0386=0x90E3
0x0387=0x51DB
0x0388=0xDDC7
0x0389=0xA7D3
0x038A=0x8AF4
0x038B=0xB91C
0x038C=0xD08B
0x038D=0x3871
0x038E=0x4530
0x038F=0x840A
0x0390=0x9177
0x0391=0x6A5F
0x0392=0x54F8
0x0393=0x4A76
0x0394=0xBE21
0x0395=0x1409
0x0396=0xCD01
0x0397=0xD84B
0x0398=0xEE60
0x0399=0x5432
0x039A=0x0843
0x039B=0x34E4
0x039C=0xB257
0x039D=0xA489
0x039E=0x0CAA
0x039F=0x914C
0x03A0=0x3298
0x03A1=0x01DA
0x03A2=0xA66C
0x03A3=0x4428
0x03A4=0xFAF8
0x03A5=0x793D
0x03A6=0x2E84
0x03A7=0xFF97
0x0400=0x8081
0x0401=0x07FF
0x0402=0x07FF
0x0403=0x0000
0x0404=0x0006
0x0405=0x0000
0x0406=0x0000
0x0407=0x0000
0x0408=0x0000
0x0409=0x0000
0x040A=0x1000
0x040B=0x2040
0x040C=0x00FB
0x040D=0x0000
0x040E=0x0002
0x040F=0x2253
0x0440=0x0020
0x0441=0x0000
0x0442=0x0000
0x0443=0x0000
0x0444=0x0000
0x0445=0x0000
0x0446=0x0000
0x0447=0x0000
0x0448=0x0000
0x0449=0x0000
0x044A=0x0000
0x044B=0x0000
0x044C=0x0000
0x044D=0x0000
0x044E=0x0000
0x044F=0x0000
0x0450=0x0000
0x0451=0x0000
0x0452=0x0000
0x0453=0x0000
0x0454=0x0000
0x0455=0x0000
0x0456=0x0000
0x0457=0x0000
0x0458=0x0000
0x0459=0x0000
0x045A=0x0000
0x045B=0x0000
0x045C=0x0000
0x045D=0x0000
0x045E=0x0000
0x045F=0x0000
0x0460=0x0000
0x0461=0x0000
0x0480=0x3E14
0x0481=0xA820
0x0482=0xB214
0x0483=0xEF09
0x0484=0xC4AB
0x0485=0xD249
0x0486=0x33FA
0x0487=0x03A4
0x0488=0x9661
0x0489=0xE192
0x048A=0x0E43
0x048B=0xF33A
0x048C=0x8551
0x048D=0x35B2
0x048E=0x1844
0x048F=0x8A52
0x0490=0x90EA
0x0491=0xE1F0
0x0492=0x7D81
0x0493=0x8301
0x0494=0x83DC
0x0495=0x8E5C
0x0496=0x6A91
0x0497=0x2621
0x0498=0x0279
0x0499=0x8655
0x049A=0xDC71
0x049B=0xD18A
0x049C=0x3646
0x049D=0xF4CE
0x049E=0xBA8E
0x049F=0x3E7E
0x04A0=0xCDB4
0x04A1=0x294D
0x04A2=0x11A9
0x04A3=0xD672
0x04A4=0x64B4
0x04A5=0x5CE3
0x04A6=0x3456
0x04A7=0xCB4E
0x04C0=0xEF4D
0x04C1=0x7976
0x04C2=0xAF3A
0x04C3=0x433D
0x04C4=0xF156
0x04C5=0xAA08
0x04C6=0xFE89
0x04C7=0x50E7
0x04C8=0x46F6
0x04C9=0x0C6B
0x04CA=0x2389
0x04CB=0xBBCE
0x04CC=0xAEBD
0x04CD=0xB307
0x04CE=0x2A4D
0x04CF=0x4BA3
0x04D0=0xE78F
0x04D1=0x9E14
0x04D2=0x276C
0x04D3=0x2929
0x04D4=0x8C4D
0x04D5=0x058B
0x04D6=0xF1B8
0x04D7=0xA449
0x04D8=0x922F
0x04D9=0x6051
0x04DA=0x0520
0x04DB=0x511D
0x04DC=0xB29C
0x04DD=0x0FF3
0x04DE=0xB9FC
0x04DF=0x056D
0x04E0=0xA902
0x04E1=0x02A5
0x04E2=0x359E
0x04E3=0x5B4C
0x04E4=0x1B29
0x04E5=0x1584
0x04E6=0x3643
0x04E7=0x341D
0x0500=0x55F7
0x0501=0xC0EF
0x0502=0x5E87
0x0503=0xDD03
0x0504=0x8BC4
0x0505=0x884D
0x0506=0x726D
0x0507=0x3200
0x0508=0xA051
0x0509=0xAD9C
0x050A=0x3ECD
0x050B=0x7879
0x050C=0x3A50
0x050D=0x4E0F
0x050E=0x4698
0x050F=0x34CF
0x0510=0x686F
0x0511=0xD7E1
0x0512=0x97E6
0x0513=0xA7A4
0x0514=0x6CE7
0x0515=0x8BF7
0x0516=0x3A89
0x0517=0x22DA
0x0518=0x81B7
0x0519=0x2851
0x051A=0x27EF
0x051B=0x3F4D
0x051C=0xD298
0x051D=0xFC62
0x051E=0xA0CD
0x051F=0xA3EE
0x0520=0x73B5
0x0521=0x6F99
0x0522=0x7760
0x0523=0x697B
0x0524=0x40C4
0x0525=0x7E62
0x0526=0x7D6C
0x0527=0x989F
0x0540=0xBB87
0x0541=0xDC77
0x0542=0x2B26
0x0543=0x7A52
0x0544=0x3934
0x0545=0x34C3
0x0546=0xCE14
0x0547=0x59C8
0x0548=0x2A60
0x0549=0x952B
0x054A=0x8AEA
0x054B=0xF609
0x054C=0xA2A8
0x054D=0xE3EC
0x054E=0x3E2C
0x054F=0x93EC
0x0550=0x43A2
0x0551=0xF196
0x0552=0xA41A
0x0553=0x5271
0x0554=0xBCB9
0x0555=0x40A6
0x0556=0xE0E3
0x0557=0x5DA6
0x0558=0x7597
0x0559=0xFAA0
0x055A=0x4D4E
0x055B=0x53A1
0x055C=0x50E9
0x055D=0x6DDB
0x055E=0x4689
0x055F=0xFB07
0x0560=0xDAC9
0x0561=0x3CE7
0x0562=0x6F43
0x0563=0x326C
0x0564=0xA756
0x0565=0x40F8
0x0566=0xD434
0x0567=0x2FE2
0x0580=0x810E
0x0581=0x7A13
0x0582=0x37F4
0x0583=0x5A67
0x0584=0xBC00
0x0585=0x4EC1
0x0586=0xF214
0x0587=0x9441
0x0588=0xD282
0x0589=0xA38C
0x058A=0xA697
0x058B=0xECBC
0x058C=0x19A5
0x058D=0x9DF9
0x058E=0xA8B7
0x058F=0xB3F2
0x0590=0x937F
0x0591=0x865B
0x0592=0x2177
0x0593=0x5860
0x0594=0x7F29
0x0595=0xFCA7
0x0596=0x842E
0x0597=0x4413
0x0598=0x31CD
0x0599=0xF57B
0x059A=0x9984
0x059B=0xA45C
0x059C=0xF6D5
0x059D=0x9194
0x059E=0xF2AD
0x059F=0xE120
0x05A0=0x2C1B
0x05A1=0xE657
0x05A2=0x11F3
0x05A3=0x2116
0x05A4=0x7AA6
0x05A5=0xC5CE
0x05A6=0x5C3D
0x05A7=0x72E7
0x05C0=0x00FF
0x05C1=0x0000
0x05C2=0x0000
0x05C3=0x4000
0x05C4=0x4000
0x05C5=0x4000
0x05C6=0x4000
0x05C7=0x4000
0x05C8=0x4000
0x05C9=0x4000
0x05CA=0x4000
0x05CB=0x1F0F
0x05CC=0x0000
0x0600=0x0F01
0x0601=0x0000
0x0602=0x2000
0x0603=0x0000
0x0604=0x0000
0x0605=0x0000
0x0606=0x0000
0x0640=0x00A1
0x0641=0x2040
[lms7002_registers_b]
0x0100=0x340E
0x0101=0x7800
0x0102=0x3180
0x0103=0x0A12
0x0104=0x0088
0x0105=0x000E
0x0106=0x318C
0x0107=0x318C
0x0108=0x318C
0x0109=0x57C1
0x010A=0x154C
0x010B=0x0001
0x010C=0x88FE
0x010D=0x011A
0x010E=0x0000
0x010F=0x3142
0x0110=0x2B14
0x0111=0x0000
0x0112=0x000C
0x0113=0x03C2
0x0114=0x01F0
0x0115=0x000E
0x0116=0x8180
0x0117=0x280C
0x0118=0x418C
0x0119=0x5292
0x011A=0x3001
0x011C=0x8941
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0x011E=0x0790
0x011F=0x3780
0x0120=0xE6C0
0x0121=0x3068
0x0122=0x0514
0x0123=0x200F
0x0124=0x001F
0x0125=0x9400
0x0126=0x12FF
0x0200=0x00E0
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0x0604=0x0000
0x0605=0x0000
0x0606=0x0000
0x0640=0x00A1
0x0641=0x2040
[reference_clocks]
sxt_ref_clk_mhz=30.72
sxr_ref_clk_mhz=30.72

@Grimmace @clarkebowers if we could keep the discussion respectful, please :slight_smile:

Just to clear a few things up:

If someone mentions a frequency which happens to be licensed under some condition or other, please do not immediately assume that a) they intend to freely radiate on that frequency and b) that if they do, they do not have the right to. There are 1,001 — actually, probably a lot more — cases where you might want to generate a carrier on some frequency or other, with a perfectly valid use that does not involve transmission in free space.

As an aside, none of our SDRs produce a transmit output of anything like this. LimeSDR USB output at 7.5MHz is around a few dBm.

https://wiki.myriadrf.org/LimeSDR_HF_Performance

So probably 0.003W or so max.

I’m sorry @clarkebowers I guess I am misinformed about the output power.

@andrewback thank you for clarifying. Not enough power to likely bother anyone. I thought the Lime had a bit more power from my reading months back. That would explain a failed experiment.

Cable modems are a common example of closed systems that operate at lower frequencies. Unfortunately closed systems leak. And some aren’t shielded well at all like DSL and powerline adapters. Many items cause noise due to non enforcement of regulations and global markets with many poor quality electronics. I’m not sure this applies to the Lime much though. Decoupling the USB cable and power input with ferrite beads does greatly reduce signal noise on the receive of it though.

@andrewback and @Zack,

Thanks for your help. The new INI file generates a 7.5 MHz signal. The 30 MHz VCO signal has been greatly attenuated and it appears as noise on the 7.5 sinewave. See the attached scope shot.

I am going to increase the VCO frequency to 500 MHz and try the low pass TBB filter to eliminate the VCO.

Thanks for your assistance.