# LimeSDR and log periodic pcb antenna **URL:** \ **Category:** LimeSDR\ **Created:** [14 February 2017 09:08 UTC](https://discourse.myriadrf.org/t/limesdr-and-log-periodic-pcb-antenna/757 "2017-02-14T09:08:43Z")\ **Posts on this page:** 7\ **Page:** 1

**Author:** ![skappy](https://avatars.discourse-cdn.com/v4/letter/s/e68b1a/32.png) [@skappy](https://discourse.myriadrf.org/u/skappy)\ **Post date:** [14 February 2017 09:08 UTC](https://discourse.myriadrf.org/t/limesdr-and-log-periodic-pcb-antenna/757/1 "2017-02-14T09:08:43Z")

Dear All, I’m the proud owner of a brand-new-just-arrived LimeSDR device and i’m now trying to choose the antennas and i’m still wondering about the use of a log perodic pcb antenna (850 - 6500 MHz) ? Do you think that it is a relevant choice ? Which socket should I choose on the Limesdr for connecting such an antenna please ? Thank you very much for your help, Have a great day Skappy ---

**Author:** ![Zack](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/zack/32/89_2.png) [@Zack](https://discourse.myriadrf.org/u/Zack)\ **Post date:** [14 February 2017 09:41 UTC](https://discourse.myriadrf.org/t/limesdr-and-log-periodic-pcb-antenna/757/2 "2017-02-14T09:41:36Z")

I can not comment regarding antenna itself, but do not understand why you want 6.5GHz. In terms of connector you need U.FL female one on antenna cable, check this thread: > [@RF and USB cable specifics](https://discourse.myriadrf.org/t/rf-and-usb-cable-specifics/677): > > Embarking on a journey into SDR. I wanted to make sure I get the right cables. For the USB I have ordered the micro-B style board. The cable I am looking at is like this one. I think the ferrites are a good idea but am I right? Is there a downside to having ferrites? [http://www.digikey.com/product-detail/en/cnc-tech/103-1092-BL-F0050/1175-1799-ND/5774470](http://www.digikey.com/product-detail/en/cnc-tech/103-1092-BL-F0050/1175-1799-ND/5774470) For the RF cables I am looking at this cable. But I don’t know which exact connectors are on the board and I don’t find that information. … ---

**Author:** ![skappy](https://avatars.discourse-cdn.com/v4/letter/s/e68b1a/32.png) [@skappy](https://discourse.myriadrf.org/u/skappy)\ **Post date:** [14 February 2017 10:49 UTC](https://discourse.myriadrf.org/t/limesdr-and-log-periodic-pcb-antenna/757/3 "2017-02-14T10:49:26Z")

Hi Zack, Thank you for your help … I do not want 6.5 Ghz but I’m looking for a large spectra antenna and the ones that can be found generally goes up to 6500 mhz… I plan to put the LimeSDR in an aluminum case with U.FL to external SMA connector , and then connect the external sma connector to the aluminium case sma connector. Is there some LimeSDR users who have experiment with a log periodic pcb antenna please ? Thank you very much for your help ! ---

**Author:** ![pe2ben](https://avatars.discourse-cdn.com/v4/letter/p/c4cdca/32.png) [@pe2ben](https://discourse.myriadrf.org/u/pe2ben)\ **Post date:** [14 February 2017 12:40 UTC](https://discourse.myriadrf.org/t/limesdr-and-log-periodic-pcb-antenna/757/4 "2017-02-14T12:40:08Z")

Hi skappy, I use 2 of these antenna’s to experiment between 2 hackrf’s. I use a piece of semi-rigid cable with on one side a female SMA connector and the other side (smallest part from the antenna) the cable directly on the PCB . Then i soldered the outer conductor from the semi-rigid cable on the middle lane on 3 places to secure the cable there (no bad influence to the antenna performance). The semi-rigid cable is a inch longer than the antenna. That part i make stiff with some solder. You can also solder a PCB SMA male or female connector in the prepared holes and connect there you coax cable. But take care that this cable not influence the performance from that antenna. I have to find a definitive solution for a non conductive stand for these antenna’s. But for now i use some hard foam where i push the antenna in It works for me very well for indoor experiments. But remind that a logper antenne is not selective. So you have to filter it by yourself. Regards Ben ---

**Author:** ![Kc7noa](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/kc7noa/32/144_2.png) [@Kc7noa](https://discourse.myriadrf.org/u/Kc7noa)\ **Post date:** [14 February 2017 16:19 UTC](https://discourse.myriadrf.org/t/limesdr-and-log-periodic-pcb-antenna/757/5 "2017-02-14T16:19:46Z")

> [@skappy](#): > > I do not want 6.5 Ghz but I’m looking for a large spectra antenna and the ones that can be found generally goes up to 6500 mhz… What frequency edges do you wish to use and how much gain? ---

**Author:** ![skappy](https://avatars.discourse-cdn.com/v4/letter/s/e68b1a/32.png) [@skappy](https://discourse.myriadrf.org/u/skappy)\ **Post date:** [15 February 2017 08:04 UTC](https://discourse.myriadrf.org/t/limesdr-and-log-periodic-pcb-antenna/757/6 "2017-02-15T08:04:07Z")

Dear Kc7noa and pe2ben, Thank you very much for your help and information… I’m a kind of newbie in the SDR field and I would like to find a universal antenna which allow me to explore from about 400 mhz up to 2.4 Ghz … I have no particular frequency in minds but GSM, wireless communication and other usual communication devices attract me a lot … May I ask you , according to you, what would be the more relevant antenna’s choice please ? I’m a bit lost :-/ Thank you once again for the help ! Skappy ---

**Author:** ![Kc7noa](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/kc7noa/32/144_2.png) [@Kc7noa](https://discourse.myriadrf.org/u/Kc7noa)\ **Post date:** [15 February 2017 17:45 UTC](https://discourse.myriadrf.org/t/limesdr-and-log-periodic-pcb-antenna/757/7 "2017-02-15T17:45:08Z")

I like this antenna … but it does not cover up to 2.4Ghz … 4.7db gain (7.7dbi) [http://www.innovantennas.com/our-antennas/view/productdetails/virtuemart\_product\_id/506/virtuemart\_category\_id/75.html](http://www.innovantennas.com/our-antennas/view/productdetails/virtuemart_product_id/506/virtuemart_category_id/75.html) you might need to use 2 log antenna’s for the span your looking for …