# LimeSDR learning curve

**URL:** <https://discourse.myriadrf.org/t/limesdr-learning-curve/866>\
**Category:** LimeSDR\
**Created:** [4 March 2017 08:32 UTC](https://discourse.myriadrf.org/t/limesdr-learning-curve/866 "2017-03-04T08:32:46Z")\
**Posts on this page:** 8\
**Page:** 2

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**Author:** ![9a4db](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/9a4db/32/2675_2.png) [@9a4db](https://discourse.myriadrf.org/u/9a4db)\
**Post date:** [12 March 2017 18:37 UTC](https://discourse.myriadrf.org/t/limesdr-learning-curve/866/21 "2017-03-12T18:37:01Z")

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Hi Dimitar  
Pls find here some initial info…

> **[Amateur radio frequency allocations](https://en.wikipedia.org/wiki/Amateur_radio_frequency_allocations)**
>
> Amateur radio frequency allocation is done by national telecommunication authorities. Globally, the International Telecommunication Union (ITU) oversees how much radio spectrum is set aside for amateur radio transmissions. Individual amateur stations are free to use any frequency within authorized frequency ranges; authorized bands may vary by the class of the station license.
> Radio amateurs use a variety of transmission modes, including Morse code, radioteletype, data, and voice. Specific fr...

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**Author:** ![9a4db](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/9a4db/32/2675_2.png) [@9a4db](https://discourse.myriadrf.org/u/9a4db)\
**Post date:** [12 March 2017 19:11 UTC](https://discourse.myriadrf.org/t/limesdr-learning-curve/866/22 "2017-03-12T19:11:25Z")

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My conclusion out of above results are…  
Lime can be used quite well like any other SDR on HF but that need to be behind solid band pass  
filters or on remote locations where RF spectrum is not saturated.

Above results are on location where no GSM towers are in direct view, FM broadcasting is limited in  
power and no any other local source of RF except 2,4 GHz wireless…

73 Dj

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**Author:** ![9a4db](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/9a4db/32/2675_2.png) [@9a4db](https://discourse.myriadrf.org/u/9a4db)\
**Post date:** [13 March 2017 11:23 UTC](https://discourse.myriadrf.org/t/limesdr-learning-curve/866/23 "2017-03-13T11:23:48Z")

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Mr. Mailman left some toys today 😃

 ![](https://canada1.discourse-cdn.com/flex034/uploads/myriadrf/original/1X/5203572e28ef7d0c88c01c5fe389b63e8bee96e8.jpg)  
LNA4HF  
+  
LNA4ALL

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**Author:** ![9a4db](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/9a4db/32/2675_2.png) [@9a4db](https://discourse.myriadrf.org/u/9a4db)\
**Post date:** [13 March 2017 23:22 UTC](https://discourse.myriadrf.org/t/limesdr-learning-curve/866/24 "2017-03-13T23:22:05Z")

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No time to install LNA4HF but some tests are here without preamp, draw your own conclusions…  
Same setup like for 7 MHz just please keep in mind that FC700 is in THRU mode on 1,8 MHz

 ![](https://canada1.discourse-cdn.com/flex034/uploads/myriadrf/original/1X/bf1c41c71ca9dffbc2dcac24ad573fd06fb6fb0b.png)

 ![](https://canada1.discourse-cdn.com/flex034/uploads/myriadrf/original/1X/f931fb513f68999051a37256d8d3d61293ecbb81.png)

 ![](https://canada1.discourse-cdn.com/flex034/uploads/myriadrf/original/1X/7b3cd217e721972f2342b8036c75e98f0c6b65eb.png)

 ![](https://canada1.discourse-cdn.com/flex034/uploads/myriadrf/original/1X/88190588bcc179b28da4bb1284cccffc8c97d16c.png)

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**Author:** ![9a4db](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/9a4db/32/2675_2.png) [@9a4db](https://discourse.myriadrf.org/u/9a4db)\
**Post date:** [23 March 2017 19:17 UTC](https://discourse.myriadrf.org/t/limesdr-learning-curve/866/25 "2017-03-23T19:17:13Z")

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After some considerations, what & how decided to order 2 pcs of

> **[CLPFL-0050-BNC.pdf](https://www.crystek.com/microwave/spec-sheets/filter/CLPFL-0050-BNC.pdf)**
>
> 569.62 KB

  
Hope to test with LNA4ALL and LNA4HF on HF and 50 MHz

Source of inspiration is this design -\>

> **[Analog Frontend -](http://www.panoradio-sdr.de/sdr-hardware/analog-frontend/)**
>
> Description of the analog frontend for the Panoradio SDR with the anti-aliasing filters for the wideband 100 MHz bandwidth operation and 70cm reception.

73  
Dj

PS Yes I know how to make them on my own, but I am not near my lab  
and like to play with Lime in the mean time…

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**Author:** ![9a4db](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/9a4db/32/2675_2.png) [@9a4db](https://discourse.myriadrf.org/u/9a4db)\
**Post date:** [24 March 2017 22:02 UTC](https://discourse.myriadrf.org/t/limesdr-learning-curve/866/26 "2017-03-24T22:02:12Z")

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My favor NDB on 418 kHz  
End feed antenna, 9:1 balun

Signal divider optimized for HF  
first side  
SDRplay RSP1 signal level marginal but notable using LSB or CW  
second side  
LNA4HF in front of LimeSDR no luck with any signal…on LNA W, modified

73  
Dj

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**Author:** ![MadMax](https://avatars.discourse-cdn.com/v4/letter/m/8baadc/32.png) [@MadMax](https://discourse.myriadrf.org/u/MadMax)\
**Post date:** [24 March 2017 22:17 UTC](https://discourse.myriadrf.org/t/limesdr-learning-curve/866/27 "2017-03-24T22:17:54Z")

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Why not compare the LimeSDR vs. any SDR on 418 kHz to see how much dB the LimeSDR is down. Then it will be easy to understand if Lime can be used on 418 kHz at all.

As I mentioned earlier, my dongle armed with a simple dbm mixer and canned oscillator is receiving the NDBs like 1000 km away without any problems.

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**Author:** ![9a4db](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/9a4db/32/2675_2.png) [@9a4db](https://discourse.myriadrf.org/u/9a4db)\
**Post date:** [25 March 2017 08:15 UTC](https://discourse.myriadrf.org/t/limesdr-learning-curve/866/28 "2017-03-25T08:15:11Z")

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Sure, that is on To-Do list 🙂

Some other members here done that with Lime too, but up conversion  
is not the subject here 😃

All must keep in mind that my test goes on LimeSDR RX1\_W input, with coil removed.  
Like to keep LimeSDR RX1\_L input optimized for other project on GSM band.

BTW  
LNA4HF + SDRplay RSP1 make nice rich AM reception on the same 418 kHz NDB

73  
Dj

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