# Happy days are here again - LimeSDR lives in HF!

**URL:** <https://discourse.myriadrf.org/t/happy-days-are-here-again-limesdr-lives-in-hf/725>\
**Category:** LimeSDR\
**Created:** [11 February 2017 02:06 UTC](https://discourse.myriadrf.org/t/happy-days-are-here-again-limesdr-lives-in-hf/725 "2017-02-11T02:06:30Z")\
**Posts on this page:** 20\
**Page:** 1

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**Author:** ![martywittrock](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/martywittrock/32/66_2.png) [@martywittrock](https://discourse.myriadrf.org/u/martywittrock)\
**Post date:** [11 February 2017 02:06 UTC](https://discourse.myriadrf.org/t/happy-days-are-here-again-limesdr-lives-in-hf/725/1 "2017-02-11T02:06:30Z")

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This evening, I did the ‘EasyFix1’ on my V1.2 LimeSDR - - the same fix that @sdr_research suggested TWO DAYS AGO - - which was REALLY EASY to do - removing ONE SMT coil (MN18) from the board at the RX1\_L Port that was in parallel with the matching transformer. The results WERE ASTOUNDING!!! Here are the BEFORE and AFTER pictures on the 40m Band this evening:

BEFORE on 40m:

 ![](https://canada1.discourse-cdn.com/flex034/uploads/myriadrf/original/1X/4ec0c3f459aad8b916f79938e4de056d95f4c8f8.jpg)

AFTER on 40m:

 ![](https://canada1.discourse-cdn.com/flex034/uploads/myriadrf/original/1X/fb033bd8fd6a2c43dc7dd00b745c91fbe5a506ab.jpg)

…and here is the AM Band that we could NEVER get before…

 ![](https://canada1.discourse-cdn.com/flex034/uploads/myriadrf/original/1X/ed4739c0c913abde8b9ed79616f95d31f3b89cc6.jpg)

..Finally, here are two pictures of the 75m Band that was VERY marginal before, but looks GREAT now..!!:

 ![](https://canada1.discourse-cdn.com/flex034/uploads/myriadrf/original/1X/ea20d795aee23c96e787e0306a7a840f4da240f9.jpg)

 ![](https://canada1.discourse-cdn.com/flex034/uploads/myriadrf/original/1X/d2d8981aabdf1e6cc1b2c86a4c9b29e38a1984f6.jpg)

So, Ladies and Gentlemen…GO HEAT UP YOUR SOLDERING IRONS AND REMOVE THAT MN18 COIL!! It will make your LimeSDR work like a CHARM on HF and you can even receive the US AM Radio Band, too..!!

Obviously I need to do more refined testing, but I’m here to tell you - - THE LIME LIVES ON HF!!!

de Marty, KN0CK

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**Author:** ![vince48](https://avatars.discourse-cdn.com/v4/letter/v/2bfe46/32.png) [@vince48](https://discourse.myriadrf.org/u/vince48)\
**Post date:** [11 February 2017 02:42 UTC](https://discourse.myriadrf.org/t/happy-days-are-here-again-limesdr-lives-in-hf/725/2 "2017-02-11T02:42:21Z")

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You ROCK Marty!

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**Author:** ![nn4f\_radio](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/nn4f_radio/32/68_2.png) [@nn4f\_radio](https://discourse.myriadrf.org/u/nn4f_radio)\
**Post date:** [11 February 2017 02:47 UTC](https://discourse.myriadrf.org/t/happy-days-are-here-again-limesdr-lives-in-hf/725/3 "2017-02-11T02:47:55Z")

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Confirmed, did the same mod, HF lives and also the AM band… Amazing

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**Author:** ![nn4f\_radio](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/nn4f_radio/32/68_2.png) [@nn4f\_radio](https://discourse.myriadrf.org/u/nn4f_radio)\
**Post date:** [11 February 2017 02:50 UTC](https://discourse.myriadrf.org/t/happy-days-are-here-again-limesdr-lives-in-hf/725/4 "2017-02-11T02:50:55Z")

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Oh didn’t even need a soldering iron the part popped off when I touched it…

 ![](https://canada1.discourse-cdn.com/flex034/uploads/myriadrf/original/1X/ef3bdf47bd4ad0f0c45580f032988d365f03beb5.JPG)

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**Author:** ![nn4f\_radio](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/nn4f_radio/32/68_2.png) [@nn4f\_radio](https://discourse.myriadrf.org/u/nn4f_radio)\
**Post date:** [11 February 2017 02:54 UTC](https://discourse.myriadrf.org/t/happy-days-are-here-again-limesdr-lives-in-hf/725/5 "2017-02-11T02:54:34Z")

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Using just a 80ft longwire for testing 9490khz s9+52 signal…not bad

 ![](https://canada1.discourse-cdn.com/flex034/uploads/myriadrf/original/1X/6207156da52ac42c489868e2496c85ac54b36082.JPG)

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**Author:** ![nn4f\_radio](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/nn4f_radio/32/68_2.png) [@nn4f\_radio](https://discourse.myriadrf.org/u/nn4f_radio)\
**Post date:** [11 February 2017 03:02 UTC](https://discourse.myriadrf.org/t/happy-days-are-here-again-limesdr-lives-in-hf/725/6 "2017-02-11T03:02:05Z")

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25mhz of bandwidth, limit on my laptop, but so far so good, one little coil removed and voila…im a little happier now… Just now to mess with the gains to see what’s best…

 ![](https://canada1.discourse-cdn.com/flex034/uploads/myriadrf/original/1X/a2b8e3463d6e48043ce94d3737e317c667a1ced7.JPG)

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**Author:** ![sdr\_research](https://avatars.discourse-cdn.com/v4/letter/s/3be4f8/32.png) [@sdr\_research](https://discourse.myriadrf.org/u/sdr_research)\
**Post date:** [11 February 2017 03:12 UTC](https://discourse.myriadrf.org/t/happy-days-are-here-again-limesdr-lives-in-hf/725/7 "2017-02-11T03:12:48Z")

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I am person who recommended to remove the coil when Andrew still thinking software bug, but LimeSDR never say thanks to me !!

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**Author:** ![platz](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/platz/32/200_2.png) [@platz](https://discourse.myriadrf.org/u/platz)\
**Post date:** [11 February 2017 03:33 UTC](https://discourse.myriadrf.org/t/happy-days-are-here-again-limesdr-lives-in-hf/725/8 "2017-02-11T03:33:41Z")

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Are/were you using an external LNA?

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**Author:** ![nn4f\_radio](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/nn4f_radio/32/68_2.png) [@nn4f\_radio](https://discourse.myriadrf.org/u/nn4f_radio)\
**Post date:** [11 February 2017 03:36 UTC](https://discourse.myriadrf.org/t/happy-days-are-here-again-limesdr-lives-in-hf/725/9 "2017-02-11T03:36:24Z")

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Nope, just for testing, using an 80ft longwire into a 9:1 balun for coax feed, will try on the big antenna’s tomorrow, 4el HF 6 band beam and a 1500ft loop

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**Author:** ![nn4f\_radio](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/nn4f_radio/32/68_2.png) [@nn4f\_radio](https://discourse.myriadrf.org/u/nn4f_radio)\
**Post date:** [11 February 2017 03:37 UTC](https://discourse.myriadrf.org/t/happy-days-are-here-again-limesdr-lives-in-hf/725/10 "2017-02-11T03:37:50Z")

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@sdr_research, well it worked, @martywittrock messaged me, he did it to the 1.2 board, so I did it to the 1.4 board and it works great as you can see

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**Author:** ![martywittrock](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/martywittrock/32/66_2.png) [@martywittrock](https://discourse.myriadrf.org/u/martywittrock)\
**Post date:** [11 February 2017 05:20 UTC](https://discourse.myriadrf.org/t/happy-days-are-here-again-limesdr-lives-in-hf/725/11 "2017-02-11T05:20:24Z")

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I WANT to give credit where credit is due…@sdr_research is the man responsible for fixing the issue with the MN18 Coil. @sdr_research suggested this fix WELL before the LimeSDR crew did and this fix is what has been fixing EVERYBODYS board tonight that has implemented it. I was the first to try it on my V1.2 hardware and I will fix my V1.4 hardware similarly. But I want to give credit to @sdr_research for suggesting this fix FIRST and giving us all a new lease on life with our LimeSDRs.

…I’m just sick that _some_ people bailed out and got their refunds…They’ll be sick to know that ONE COIL is all that was needed to fix the LimeSDR for HF…ONE COIL, and I cannot say enough that @sdr_research was the FIRST ONE to suggest this fix. BRAVO TO @sdr_research!!!

73 de Marty, KN0CK

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**Author:** ![n5fpp](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/n5fpp/32/80_2.png) [@n5fpp](https://discourse.myriadrf.org/u/n5fpp)\
**Post date:** [11 February 2017 05:23 UTC](https://discourse.myriadrf.org/t/happy-days-are-here-again-limesdr-lives-in-hf/725/12 "2017-02-11T05:23:59Z")

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I wouldn’t discount a software problem yet. Though SDR Console is working well under Windows, the latest code from github for limesuite on Linux is still deaf. I can barely hear some RTTY on 40 at 7.070150 whereas on SDR Console the whole band is booming by comparison.

-Freeman

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**Author:** ![nn4f\_radio](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/nn4f_radio/32/68_2.png) [@nn4f\_radio](https://discourse.myriadrf.org/u/nn4f_radio)\
**Post date:** [11 February 2017 05:24 UTC](https://discourse.myriadrf.org/t/happy-days-are-here-again-limesdr-lives-in-hf/725/13 "2017-02-11T05:24:40Z")

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Bravo… @sdr_research and to you too @martywittrock, thanks for the call tonight, it’s a night and day fix, totally different radio, and paired with @SimonG4ELI software, it’s the complete package, with TX coming later in the year, this will be the go to piece of kit, it was so disappointing when we first turned it on… So onwards and upwards… Time to play…

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**Author:** ![martywittrock](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/martywittrock/32/66_2.png) [@martywittrock](https://discourse.myriadrf.org/u/martywittrock)\
**Post date:** [11 February 2017 05:27 UTC](https://discourse.myriadrf.org/t/happy-days-are-here-again-limesdr-lives-in-hf/725/14 "2017-02-11T05:27:34Z")

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I gave you credit where credit is due in this thead, @sdr_research…! YOU ARE OUR HERO FOR LIMESDR…!!

73 de Marty, KN0CK

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**Author:** ![martywittrock](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/martywittrock/32/66_2.png) [@martywittrock](https://discourse.myriadrf.org/u/martywittrock)\
**Post date:** [11 February 2017 05:40 UTC](https://discourse.myriadrf.org/t/happy-days-are-here-again-limesdr-lives-in-hf/725/15 "2017-02-11T05:40:32Z")

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…And for those who MIGHT freak out about losing the upper frequencies ( \>100 MHz ), forget it…THEY LOOK GREAT, TOO, ON THE SAME PORT WE MODIFIED FOR HF (Rx1\_L)..!! Here is what the weather band looks like tonight at Cedar Rapids, Iowa (162.475 MHz) as well as other weather stations in the region…THEY’VE NEVER LOOKED SO GOOD NOW!! Here is a screenshot:

 ![](https://canada1.discourse-cdn.com/flex034/uploads/myriadrf/original/1X/7230372ae807ad1b2394e401e5e726e9cc063823.jpg) 

ONWARD AND UPWARD!! #LimeSDRRULES !!

73 de Marty, KN0CK

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**Author:** ![martywittrock](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/martywittrock/32/66_2.png) [@martywittrock](https://discourse.myriadrf.org/u/martywittrock)\
**Post date:** [11 February 2017 05:48 UTC](https://discourse.myriadrf.org/t/happy-days-are-here-again-limesdr-lives-in-hf/725/16 "2017-02-11T05:48:27Z")

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@Bernard MALET,

Get ready to smile, Bernard…@sdr_research fixed the issue by his suggestion two days ago…! See all the posts in this thread, but your LimeSDR can look the same as all the others by making that one small change (MN18 coil). Again, see the pictures posted tonight - at least THREE Hams have confirmed this change tonight that I did based on @sdr_research suggestion.

The LimeSDR Lives on HF, @Bernard…!! Happy Days are here again…!!

73 de Marty, KN0CK

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**Author:** ![sdr\_research](https://avatars.discourse-cdn.com/v4/letter/s/3be4f8/32.png) [@sdr\_research](https://discourse.myriadrf.org/u/sdr_research)\
**Post date:** [11 February 2017 06:17 UTC](https://discourse.myriadrf.org/t/happy-days-are-here-again-limesdr-lives-in-hf/725/17 "2017-02-11T06:17:36Z")

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I think everyone will happy with this fix and I really think LimeSDR is a valuable tool for SDR . In next release I hope Lime team will fix it on board and think about design a input board with filters controled from software as option for LimeSDR .  
@Benard : If you want to use at 100KHz you just modify input a little more it will be work well

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**Author:** ![martywittrock](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/martywittrock/32/66_2.png) [@martywittrock](https://discourse.myriadrf.org/u/martywittrock)\
**Post date:** [11 February 2017 06:18 UTC](https://discourse.myriadrf.org/t/happy-days-are-here-again-limesdr-lives-in-hf/725/18 "2017-02-11T06:18:12Z")

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YOU RULE, @sdr_research…!!

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**Author:** ![nn4f\_radio](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/nn4f_radio/32/68_2.png) [@nn4f\_radio](https://discourse.myriadrf.org/u/nn4f_radio)\
**Post date:** [11 February 2017 06:20 UTC](https://discourse.myriadrf.org/t/happy-days-are-here-again-limesdr-lives-in-hf/725/19 "2017-02-11T06:20:10Z")

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How much do you think changing the additional parts in easyfix1 would make, I think just removing MN18 is enough??

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**Author:** ![sdr\_research](https://avatars.discourse-cdn.com/v4/letter/s/3be4f8/32.png) [@sdr\_research](https://discourse.myriadrf.org/u/sdr_research)\
**Post date:** [11 February 2017 06:28 UTC](https://discourse.myriadrf.org/t/happy-days-are-here-again-limesdr-lives-in-hf/725/20 "2017-02-11T06:28:23Z")

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The lowest frequency of T3 transformer spec. is 4.5MHz but it work well till 1MHZ . With 100KHz it still can work but with some loss . If you want to go to 100KHz you need to replace T3 with a lower frequency transformer and change coupling capacitor MN17 and MN20 to around .47nF

[Next page](https://discourse.myriadrf.org/t/happy-days-are-here-again-limesdr-lives-in-hf/725.md?page=2)