Sunday, December 13, 2015

2x LNA4ALL for the Hydrogen line measurements

The LNA4ALL is a wide band LNA that cover also the Hydrogen line, 1420 MHz frequency. I receive a lot of e-mails from the guys asking for the performance of the LNA4ALL at the 1420 MHz with idea to use two LNA4ALL in series configuration to achieve the higher overall gain. The H-line guys main concern was Noise Figure and then the Gain. The feedback from the H-guys was evaluated  where we found the mixed experience. Some of them were happy with the setup, some of them admit that the LNA4ALL is good for the second stage LNA only and we have guys without instant success and the proper results due to various technically related problems deserving the completely separate new post. I will try to explain what is the value you get  for the money invested.

I already mention that the LNA4ALL is a wide band amplifier. Designing the amplifier the main goal was to end up with the unconditional stability where we count that the users may forget to connect the input/output, may short the input or output or may have all kind of mismatch situation. The LNA4ALL should handle all this situation and not run into oscillations nor fail to operate or damage the attached equipment.
The second goal was to get the low Noise Figure and the maximum possible Gain that the active device can deliver on such a wide range of frequencies. At the same time we aim to the high IP3 numbers where the LNA4ALL will not run easily into non-linearity and make more damage to the receiver chain than not running the LNA at all. The LNA current consumption was evaluated and this became also one of the limiting factors.

The simple question was, can LNA4ALL compete against the LNAs designed only to operate on 1420Mhz ? The even simpler answer is NO, it can not. The main difference is that such designed LNA should have a lower NF (0.2-0.4 dB), stability around 1420 MHz (at least), and a higher Gain (35-40 dB). Most of the LNAs that are targeting the H-line operation are within the mentioned specifications. The only drawback may be the price. They are made as plug&play units and the user does not have nothing to "tune" and play around the hardware. If they are damaged, the user must be highly skilled to repair it and tune it for the best performance.

Comparing to the above mentioned LNAs the LNA4ALL will deliver slightly weaker performance and it is on you to decide whether it will suit your needs or not. Some of our H-line users have the access to a really nice, and the most important, calibrated measuring equipment. I will share with you their measurements so you can evaluate the LNA4ALL for the H-line operation. The setup used was the two LNA4ALL connected in series with the side pads separated power supply. The first measurement was the S2,1 (Gain) measurement performed on the network analyzer. Gain of 2x LNA4ALL @ 1420 Mhz was 31.35 dB. Of course, using the only one LNA4ALL the gain will be half of that.

The second measurement was performed using the Noise figure meter and the 14dB ENR noise source head. Noise figure measured @ 1420 Mhz for the 2x LNA4ALL in series configuration was 0.698 dB and the gain of 31.9 dB. The peak in the NF graph around 1.7GHz was due to the power supply used. In the later measurements with the other power supply used the peak was gone.

The 14dB ENR noise head used in the second measurement is "universal" noise source where the  low noise, and the high noise devices can be measured. This head suits perfectly for the mixer noise figure measurements. I ask the guys if they have the possibility to repeat the same test but with the lower ENR noise source to get more accurate (higher NF) results. They reply with the following graph. The noise figure of the 2x LNA4ALL in series was 0.757 dB and the gain of 32.2 dB @ 1420 MHz. You can note that the peak around 1.7 Ghz at the NF graph was gone.

All measurements were performed using the 2x LNA4ALL without milled housings, just the bare boards with the SMA connectors attached.


  1. This comment has been removed by the author.

  2. Love to see more amazing posts regarding to amplifiers.
    airport parking deals

  3. These measurements could be done with much precautions.
    meet and greet luton airport

  4. The H-line guys main concern was Noise Figure and then the Gain.
    cheap airport parking

  5. Really! thanks Boss It amazing Information for me.

  6. Love to see more useful stuff here on your blog,you shared very useful info.

  7. Onde consigo comprar o lna4all?

  8. จบปัญหารถยนต์เข้าซ่อมแซม ไม่มีรถยนต์ใช้ เดินทางด้วยรถเมล์ ยิ่งช่วงนี้ปัญหาด้านมลพิษด้วยแล้ว มั่นใจว่าคนอีกหลายคน ไม่ต้องการประสบพบปัญหานำรถยนต์เข้าซ่อมแซมแล้วจำเป็นต้องพึ่งรถยนต์สาธารณะรถเช่าระหว่างซ่อมแซมBanana rent-a-car รถเช่าที่ให้ เช่ารถเช่าราคาไม่แพง และก็ยังรักษามาตรฐานการให้บริการรถเช่าลุกค้าที่มีความคิดว่าเช่ารถราติดอยู่ถูกแล้วจะเจอกับปัญหาต่างๆแม้กระนั้นตรงนี้ รถเช่าระหว่างซ่อมแซม ของพวกเรามีแม้กระนั้นรถยนต์คุณภาพดี สะอาด ไม่มีกลิ่นเหม็น จำเป็นต้องตรงนี้เลย รถเช่าระหว่างซ่อมแซม ของ Banana rent-a-car รถยนต์ดี ราคาไม่แพง เอกสารไม่ยุ่งยาก ไม่มีบัตรเครดิตก็เช่าได้

  9. The clarity in your post great article !!

    โปรโมชั่นGclub ของทางทีมงานตอนนี้แจกฟรีโบนัส 50%
    เพียงแค่คุณสมัคร Gclub กับทางทีมงานของเราเพียงเท่านั้น
    สมัครสมาชิกที่นี่ >>> Gclub online

  10. Thanks for the info And I hope to read this good article again.

    เว็บไซต์คาสิโนออนไลน์ที่ได้คุณภาพอับดับ 1 ของประเทศ
    เป็นเว็บไซต์การพนันออนไลน์ที่มีคนมา สมัคร Gclub Royal1688
    และยังมีเกมส์สล็อตออนไลน์ 1688 slot อีกมากมายให้คุณได้ลอง
    สมัครสมาชิกที่นี่ >>> Gclub Royal1688

  11. What a good and impressive post here.I am so excited to find this post and i am interested to visit this site again here.Thanks for it. To get heavy duty shelving click this net worth list

  12. I need to know what customer value the most with study or reference and then, I will be able to give information of how my product can improve the experience of their customer.

  13. Details in the featured article Have a very good message
    Sa gaming

  14. Your message Is a good article Can be easily understood I have interest in this field Can you read my

  15. In this manner my friend Wesley Virgin's story starts in this SHOCKING and controversial VIDEO.

    As a matter of fact, Wesley was in the army-and soon after leaving-he discovered hidden, "MIND CONTROL" tactics that the government and others used to obtain everything they want.

    THESE are the EXACT same SECRETS many celebrities (notably those who "became famous out of nowhere") and the greatest business people used to become rich and successful.

    You've heard that you use less than 10% of your brain.

    That's because most of your brainpower is UNCONSCIOUS.

    Perhaps this conversation has even occurred INSIDE your very own head... as it did in my good friend Wesley Virgin's head about 7 years back, while driving an unlicensed, beat-up bucket of a car without a driver's license and $3.20 on his bank card.

    "I'm absolutely fed up with going through life paycheck to paycheck! When will I get my big break?"

    You've taken part in those questions, am I right?

    Your success story is waiting to start. All you have to do is in YOURSELF.


  16. Thanks for the useful article. Learned and continued from the suggestions from the article very well

  17. ดู Cold Pursuit แค้นลั่นนรก (2019) หนังออนไลน์ หนัง HD ดูได้ทุกวัน ดูหนังฟรีได้แล้ววันนี้ที่

  18. Nice post. Please keep continue sharing your great ideas slot online

  19. เล่นง่าย เกมสล็อตดีๆ joker ฟรีเครดิต แจกโบนัส slot online