# SetFrequencySXR(1812,5 MHz) - cannot deliver frequency

**URL:** <https://discourse.myriadrf.org/t/setfrequencysxr-1812-5-mhz-cannot-deliver-frequency/6578>\
**Category:** LimeSDR\
**Created:** [29 September 2020 07:33 UTC](https://discourse.myriadrf.org/t/setfrequencysxr-1812-5-mhz-cannot-deliver-frequency/6578 "2020-09-29T07:33:28Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![nedsana](https://avatars.discourse-cdn.com/v4/letter/n/278dde/32.png) [@nedsana](https://discourse.myriadrf.org/u/nedsana)\
**Post date:** [29 September 2020 07:33 UTC](https://discourse.myriadrf.org/t/setfrequencysxr-1812-5-mhz-cannot-deliver-frequency/6578/1 "2020-09-29T07:33:28Z")

</div>

Hi, I am using LimeSDR-USB v1.4s with LimeSuite v20.07.2 (built from source) and srsLTE.

I have problems setting certain frequencies - I get “SetFrequencySXR(1812,5 MHz) - cannot deliver frequency” error. I can reproduce this with LimeSuiteGUI - tab “SRX” - I would type the desired frequency and would press “Calculate” button.  
Then I get the following debug log:

> ```
> [10:37:22] DEBUG: INT 114, FRAC 1365, DIV_LOCH 1, EN_DIV2_DIVPROG 1
> [10:37:22] DEBUG: VCO 7250.00 MHz, RefClk 30.72 MHz
> [10:37:22] DEBUG: ICT_VCO: 255
> [10:37:22] DEBUG: TuneVCO(SXR) - VCO too low
> [10:37:22] DEBUG: VCOL : csw=0 tune fail
> [10:37:22] DEBUG: ICT_VCO: 255
> [10:37:22] DEBUG: TuneVCO(SXR) - VCO too low
> [10:37:22] DEBUG: VCOM : csw=0 tune fail
> [10:37:22] DEBUG: ICT_VCO: 255
> [10:37:22] DEBUG: TuneVCO(SXR) - VCO too low
> [10:37:22] DEBUG: VCOH : csw=0 tune fail
> [10:37:22] DEBUG: Selected: VCOH
> [10:37:22] ERROR: SetFrequencySXR(1812.5 MHz) - cannot deliver frequency
> 
> ```

I found that the error happens for frequency ranges: 1710-1920MHz, 859.5-964.0MHz, probably others.

I found out that if I change(usually increase) the Reference Clock from 30.72MHz to 36.72MHz, for example, the desired frequency will be accepted.

I also found that LimeQuickTest fails:

> ```
> [TESTING STARTED]
> ->Start time: Fri Sep 18 10:55:43 2020
> 
> ->Device: LimeSDR-USB, media=USB 2.0, module=FX3, addr=1d50:6108, serial=0009081C05C1361B, HW=4, GW=2.23
> Warning: USB3 not available
> Serial Number: 0009081C05C1361B
> Chip temperature: 53 C
> 
> [Clock Network Test]
> ->FX3 GPIF clock test
> Test results: 23803; 27559; 31315 - PASSED
> ->Si5351C test
> CLK0: 17554 / 17554 - PASSED
> CLK1: 17554 / 17554 - PASSED
> CLK2: 17554 / 17554 - PASSED
> CLK3: 17554 / 17554 - PASSED
> CLK4: 17554 / 17554 - PASSED
> CLK5: 17554 / 17554 - PASSED
> CLK6: 17554 / 17554 - PASSED
> ->ADF4002 Test
> Result: 10 - PASSED
> ->VCTCXO test
> Results : 5112941 (min); 5113077 (max) - PASSED
> ->Clock Network Test PASSED
> 
> [FPGA EEPROM Test]
> ->Read EEPROM
> ->Read data: 13 01 18 13 01 19 03
> ->FPGA EEPROM Test PASSED
> 
> [LMS7002M Test]
> ->Perform Registers Test
> ->External Reset line test
> Reg 0x20: Write value 0xFFFD, Read value 0xFFFD
> Reg 0x20: value after reset 0x0FFFF
> ->LMS7002M Test PASSED
> 
> [RF Loopback Test]
> Note: The test should be run without anything connected to RF ports
> ->Configure LMS
> CGEN: Freq=80 MHz, VCO=2.4 GHz, INT=77, FRAC=131072, DIV_OUTCH_CGEN=14
> CGEN: Freq=80 MHz, VCO=2.4 GHz, INT=77, FRAC=131072, DIV_OUTCH_CGEN=14
> CGEN: Freq=491.52 MHz, VCO=1.96608 GHz, INT=63, FRAC=0, DIV_OUTCH_CGEN=1
> CGEN: Freq=491.52 MHz, VCO=1.96608 GHz, INT=63, FRAC=0, DIV_OUTCH_CGEN=1
> SetPllFrequency: error configuring phase
> SetPllFrequency: error configuring phase
> SetPllFrequency: error configuring phase
> SetPllFrequency: error configuring phase
> SetPllFrequency: error configuring phase
> SetPllFrequency: error configuring phase
> SetPllFrequency: error configuring phase
> SetPllFrequency: error configuring phase
> SetPllFrequency: error configuring phase
> SetPllFrequency: error configuring phase
> LML TX phase search FAIL
> Failed to set sample rate
> ->RF Loopback Test FAILED
> 
> => Board tests FAILED <=
> 
> Elapsed time: 2.29 seconds
> 
> ```

I use the LimeSDR device with external power supply (12V, 1.5A).  
Eventually I got another SDR device and the issue was not present there.

I have already posted this same topic as LimeSuite GITHub Issue:

> <https://github.com/myriadrf/LimeSuite/issues/317>
>
> Hi, I am using LimeSDR-USB v1.4s with LimeSuite v20.07.2 (built from source) and… srsLTE.
> 
> I have problems setting certain frequencies - I get \*\*"SetFrequencySXR(1812,5 MHz) - cannot deliver frequency"\*\* error. 
> I can reproduce this with LimeSuiteGUI - tab "SRX" - I would type the desired frequency and would press "Calculate" button.
> Then I get the following debug log:
> 
> \> \[10:37:22\] DEBUG: INT 114, FRAC 1365, DIV\_LOCH 1, EN\_DIV2\_DIVPROG 1
> \> \[10:37:22\] DEBUG: VCO 7250.00 MHz, RefClk 30.72 MHz
> \> \[10:37:22\] DEBUG: ICT\_VCO: 255
> \> \[10:37:22\] DEBUG: TuneVCO(SXR) - VCO too low
> \> \[10:37:22\] DEBUG: VCOL : csw=0 tune fail
> \> \[10:37:22\] DEBUG: ICT\_VCO: 255
> \> \[10:37:22\] DEBUG: TuneVCO(SXR) - VCO too low
> \> \[10:37:22\] DEBUG: VCOM : csw=0 tune fail
> \> \[10:37:22\] DEBUG: ICT\_VCO: 255
> \> \[10:37:22\] DEBUG: TuneVCO(SXR) - VCO too low
> \> \[10:37:22\] DEBUG: VCOH : csw=0 tune fail
> \> \[10:37:22\] DEBUG: Selected: VCOH
> \> \[10:37:22\] ERROR: SetFrequencySXR(1812.5 MHz) - cannot deliver frequency
> \> 
> 
> I found that the error happens for frequency ranges: \*\*1710-1920MHz, 859.5-964.0MHz\*\*, probably others.
> 
> I found out that if I change(usually increase) the Reference Clock from 30.72MHz to 36.72MHz, for example, the desired frequency will be accepted.
> 
> I also found that LimeQuickTest fails:
> 
> \> \[TESTING STARTED \]
> \> -\>Start time: Fri Sep 18 10:55:43 2020
> \> 
> \> -\>Device: LimeSDR-USB, media=USB 2.0, module=FX3, addr=1d50:6108, serial=0009081C05C1361B, HW=4, GW=2.23
> \> Warning: USB3 not available
> \> Serial Number: 0009081C05C1361B
> \> Chip temperature: 53 C
> \> 
> \> \[Clock Network Test \]
> \> -\>FX3 GPIF clock test
> \> Test results: 23803; 27559; 31315 - PASSED
> \> -\>Si5351C test
> \> CLK0: 17554 / 17554 - PASSED
> \> CLK1: 17554 / 17554 - PASSED
> \> CLK2: 17554 / 17554 - PASSED
> \> CLK3: 17554 / 17554 - PASSED
> \> CLK4: 17554 / 17554 - PASSED
> \> CLK5: 17554 / 17554 - PASSED
> \> CLK6: 17554 / 17554 - PASSED
> \> -\>ADF4002 Test
> \> Result: 10 - PASSED
> \> -\>VCTCXO test
> \> Results : 5112941 (min); 5113077 (max) - PASSED
> \> -\>Clock Network Test PASSED
> \> 
> \> \[FPGA EEPROM Test \]
> \> -\>Read EEPROM
> \> -\>Read data: 13 01 18 13 01 19 03
> \> -\>FPGA EEPROM Test PASSED
> \> 
> \> \[LMS7002M Test \]
> \> -\>Perform Registers Test
> \> -\>External Reset line test
> \> Reg 0x20: Write value 0xFFFD, Read value 0xFFFD
> \> Reg 0x20: value after reset 0x0FFFF
> \> -\>LMS7002M Test PASSED
> \> 
> \> \[RF Loopback Test \]
> \> Note: The test should be run without anything connected to RF ports
> \> -\>Configure LMS
> \> CGEN: Freq=80 MHz, VCO=2.4 GHz, INT=77, FRAC=131072, DIV\_OUTCH\_CGEN=14
> \> CGEN: Freq=80 MHz, VCO=2.4 GHz, INT=77, FRAC=131072, DIV\_OUTCH\_CGEN=14
> \> CGEN: Freq=491.52 MHz, VCO=1.96608 GHz, INT=63, FRAC=0, DIV\_OUTCH\_CGEN=1
> \> CGEN: Freq=491.52 MHz, VCO=1.96608 GHz, INT=63, FRAC=0, DIV\_OUTCH\_CGEN=1
> \> SetPllFrequency: error configuring phase
> \> SetPllFrequency: error configuring phase
> \> SetPllFrequency: error configuring phase
> \> SetPllFrequency: error configuring phase
> \> SetPllFrequency: error configuring phase
> \> SetPllFrequency: error configuring phase
> \> SetPllFrequency: error configuring phase
> \> SetPllFrequency: error configuring phase
> \> SetPllFrequency: error configuring phase
> \> SetPllFrequency: error configuring phase
> \> LML TX phase search FAIL
> \> Failed to set sample rate
> \> -\>RF Loopback Test FAILED
> \> 
> \> =\> Board tests FAILED \<=
> \> 
> \> Elapsed time: 2.29 seconds
> 
> Could you please, give some hints how can I solve this problem?
> 
> Thank you.

The conclusion there was that I face a hardware issue.

Still I was advised to post the issue here as well, before starting RMA process.  
Could you please share some comments?

Thank you.

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**Author:** ![andrewback](https://avatars.discourse-cdn.com/v4/letter/a/22d042/32.png) [@andrewback](https://discourse.myriadrf.org/u/andrewback)\
**Post date:** [29 September 2020 08:54 UTC](https://discourse.myriadrf.org/t/setfrequencysxr-1812-5-mhz-cannot-deliver-frequency/6578/2 "2020-09-29T08:54:41Z")

</div>

Please contact Crowd Supply for RMA, as advise in the GitHub issue.

[https://www.crowdsupply.com/contact#i-want-to-return-a-product-rma-request](https://www.crowdsupply.com/contact#i-want-to-return-a-product-rma-request)