LRR40 - 40Meter SSB/CW Receiver

VU3GEK-KJ6LRR & VU3CNS


The LRR40 is a high performance single–conversion superhetrodyne 40Meter Receiver, utilizing two pole tuned band-pass input filters. It is particularly well suited for portable battery powered operation. The low I.F. is compatible with narrow, variable-bandwidth CW crystal filtering. This approach results in excellent CW and SSB performance. AM signals can be received in SSB modes. The VFO is stable microcontroller controlled DDS oscillator. Alignment is reasonably simple and no winding of inductors.
This circuit design follows a standard well-proven approach based on various kits available on WWW modifications have been done.

Features & specification

  • 7.000 -7.300MHz frequency receptions.

  • AM/SSB & CW.

  • Sensitivity Approx. 0.5μV.

  • IF: 4.9152MHz

  • DDS VFO of tuning step 1, 10,100Hz &1,10,100KHz.

  • 16x2 LCD Readout

  • Selectivity 4-pole variable-bandwidth crystal filter, approx. 200-2000 Hz

  • Switchable attenuator (10 & 20dB).

  •  12VDC Power.

  •  0.1Watts Audio Output/ Stereo pin.

  • Size 155 x 105 x 30 mm.

  • Weight : 425 gms

  • Available as a DIY kit or fully assembled high quality components for reliable operation.


Performance of the receiver depends on external antenna used


                     VIDEO DEMO 30Mins -  NEW on 5/2/2013

http://www.youtube.com/watch?v=eQbHeEB-keg

or 6 mins sample play here
video
 VIDEO DEMO - OLD
                                         
            http://youtu.be/2zh6kuK0a-Q


Full unit ( Rs2300) Tested

DIY Kit (Rs2200) With SMD Components pre assembled  

* Speaker,Antenna & power supply not included.
* Shipment cost extra 
*  At present shipment only in India
NOTE:  
Specification , design and cost subject to change without prior notice.
This product Kit is sold "as is " without warranty or guarantee of any kind. 

STOCK Ready against order (2/2/2013)


N.Ganesan
ganesan4u@hotmail.com
09363105352
Coimbatore
Tamil Nadu
 India

Workshop photos at

https://plus.google.com/photos/116031327768066348011/albums/5843672612045664529

27 comments:

  1. Dear Ganesan, Many thanks for taking up this interesting project and information here. This will be use full for many swls & Hams. Greetings to you, 73's krish, vu3nkk

    ReplyDelete
  2. Hello Ganesan,

    Please publish the Price of Kit and Assembled Rx. Becuase it's will be the first thing ham/swl want to know.

    Anoop VU2IAO

    ReplyDelete
  3. CONGRATULATIONS DEAR GANESAN. ITS A DREAM PROJECT FOR SWLs AND BEGINNERS. THANKS FOR TAKING HIGH PRIORITY TO POPULARISE HAM RADIO THRU THIS TYPE OF ACTIVITIES.

    SHINDO VU3SOH.

    ReplyDelete
  4. Dear Ganesh,
    Congrags on the project.
    It was nice to meet you at the RSB meet.
    best 73
    Rajesh
    VU3VOC / AK4EC / A92GK

    ReplyDelete
  5. Thanks for bringing the board to our VU2RSB silver jubilee eyeball Ganeshan.
    Great job and very professional work. Please make it into a kit available to
    all the hambrewers to build and have fun!

    Folks, Ganeshan has also designed and built cube sat modules and as his
    signature work they are very professional! A transceiver kit will be great!

    Cheers
    Raj, vu2zap

    Message forwarded from HamBrewers@yahoogroups.com

    thank you ZAP,thank you friends

    thank you very much for your all encouragement

    this will force me to do better and more

    73,
    N.Ganesan
    KJ6LRR

    ReplyDelete
  6. I must admit that the performance is superb.Is there any possibility that I can also buy a kit. 73-
    Atanu, VU2ATN

    ReplyDelete
  7. Dear Ganesan,
    Thanks for this interesting project and information here. This will be use full for many swls & Hams. Pongal Greetings to you,
    73's

    VU2LDH

    ReplyDelete
  8. sir plz tel me full assembal kit and cabine prise
    my e mail is das884@gmail.com

    ReplyDelete
  9. i would like to have a kit....
    Price????????
    lgkriskr@gmail.com
    Krishnakumar

    ReplyDelete
  10. thanks, for digital readout receiver

    ReplyDelete
  11. It is my dream one LRR40 - 40Meter SSB/CW Receiver..but out of stock..

    ReplyDelete
  12. Hi

    Can you let me have the cost for the LRR 40 40 Mtr Rx fully assembled.
    My Email -
    daverohitb@hotmail.com

    ReplyDelete
  13. Congrats OM Ganesan, VU3GEK-KJ6LRR ! I would love to buy the kit and assemble. But I think mounting/soldering the SMD components would be a bit tricky for me as I have never tried [ but interested to learn]..With the SMDs mounted by you, I would love to try assembling the rest of the kit ...
    Tnx es vy best 73 de Sandeep VU2MUE [ Previously VU2MSY ]
    http://www.qsl.net/vu2msy
    http://www.riverdevil.org/APRS/vu2msy

    ReplyDelete
  14. Today 2nd Feb 2013, I have received 1st LRR40 & tested with my inverted V Antenna.
    The calibaration is perfect & RX performance is comparable with my Yaesu FT 747 commercial rig.The attunauters 10dB & 20dB are found useful. All the very best for his good work which is required for budding Hams & SWLs.
    73s, de, krish, vu3nkk

    ReplyDelete
  15. Dear Ganesan
    Very good receiver small and compact best for mobile use, please develope with transmiting function,best of luck ,vu3nkk had given live comparision between ft747 in vhf,vu3nkk feels the attunaters is good,my self also feel it perfom best as commercial,All the best.
    73's ,de,Prakasan,VU2PTH

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  16. let me know the cost please

    ReplyDelete
  17. Mr.Ganesan,
    What is the price? Please. Is it possible to collect in Maha meet?
    73s bye de saradhy VU2NVU from NELLORE.

    ReplyDelete
  18. I would also like to know about the price and shipping cost. 73 de vu3inj, Email:- indrajitsinhrathod2009@gmail.com

    ReplyDelete
  19. Dear Ganesan,

    If this radio can be used for Hams, Is there any provision to mute or switch off when i am transmitting?

    VU3SOH.

    ReplyDelete
  20. today I have tested my receiver.. reception is excellent..tnk u VU3GEK
    We r expecting a Tx soon for accompanying this Rx

    ReplyDelete
  21. It was my first 40 meter reception on a superhat receiver.(17th Feb 2013)
    The Receiver was performing great!!
    I am a novice to the Ham Radio receivers and antennas, after doing a whole day work on antennas and making and destroying 4-5 antennas, finally i used an inverted vee for this. (approx. 40 ft. high, 10 mtrs on both legs, using 1 sq mm 1100 v electricity wire).
    The ATT's 10dB & 20dB are very useful.
    Thanks again N.Ganesan for choosing such a agile courier service!! approx. 2709 Km and on 4th day the parcel was in my hands!! and thanks again for his help for the Inverted vee's guidelines.

    The LRR-40 is really a great work, Greetings to N. Ganesan and all the Operators/SWL's

    A video recording of the reception is available on youtube.
    http://youtu.be/WJjS3mbgssU

    ReplyDelete
  22. I got my LRR-40 yesterday and since then i have been glued to it leaving my other equipment aside. The performance has been at par with You Tube presentation. I am really impressed by its performance and look. It will adore my shack. I expect more such extra-ordinary efforts by Ganesh.All the best-
    Atanu Dasgupta, VU2ATN

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  23. My Dear OM Ganeshan,

    Yesterday, being Sunday, I spent maximum time with your LRR-40 ..

    The Test Report arrives like 599 + 1000 dB

    Really excellent workmanship and superb gain, selectivity and s/n ratio

    So much impressed.

    Keep it up the good work. You can be the inspiration for the OT hams
    like me who becomes LAZY after getting Icom, Yaesu or Kenwood rigs on
    their desktops. You are the inspiration and catalysts to say.."Wake up
    SID..!!" to all radio amateurs who have in-built home-brewer inside
    his/her soul...

    I think this is the right definition to describe VU3GEK

    73

    DX'ingly yours..

    Adhir Saiyadh VU2MAU
    with
    Padmaja (MIKY) Saiyadh VU3MAU

    ReplyDelete
  24. Pls let us know if u sell pre assembled with the cover and other accessories and what will be the price

    ReplyDelete
  25. any news? 73 de SV2CLJ

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  26. Dear ganesh, thanks for the rx. the volume is very low .weak stations reception is poor and i hered w land stations in my kenwood ts 480. but didnt hered in LRR 40 @ same time. why? please publish the circuit or e-mail.(not for homebrewing, only 4 studying).Noice is low compared with kenwood...73 de vu2vid

    ReplyDelete
    Replies
    1. Dear VID,

      1) This receiver is designed for battery operation , audio out put will be only around 0.1Watts,you have to use only Head phone, if you need louder audio add external audio power amplifier, speaker etc.

      2) for Weak station reception add low noise pre-amplifier , for strong station reception remove the pre-amplifier and you can use 10dB and 20dB Attunator combination.

      these are the limitations of this receiver.

      Good quality external antenna is recommended for better reception quality

      by the way

      ts 480 is Rs30,000/- and this receiver is Rs2300/- only

      this receiver has its own limitations and limited specification.

      Till date AUG /2013 Total 79 receivers have been shipped for SWLs to monitor the local QSO.

      73,
      VU3GEK - KJ6LRR

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