LRR400 - HF RECEIVER

N.Ganesan - VU3GEK-KJ6LRR
(UNDER TESTING)


The LRR400 is a high performance single–conversion superhetrodyne HF Receiver, utilizing tuned band-pass input filters on each band with excellent dynamic range double balanced ring diode mixers. This approach results in excellent CW and SSB performance. The low I.F. is compatible with narrow, variable-bandwidth CW crystal filtering and allows the use of fast I.F.-derived AGC. The VFO is stable microcontroller controlled DDS oscillator. AM signals can be received in SSB modes. Optional low-noise analog variable audio filter circuit used here is a low-pass filter with switched capacitors, elliptical, of 8th order for improved audio easily compares the reception with that of a receiver equipped with DSP filter.

This circuit design follows a standard well-proven approach based on various kits available on WWW modifications have been done.

           
Features & specification
q  160-10 Meter receptions.
q  AM/SSB & CW.
q  DDS VFO of tuning step 1, 10,100Hz, 1, 10,100 KHz, 1& 10MHz.
q  Sensitivity Approx. 0.2 μV.
q  Selectivity 5-pole variable-bandwidth crystal filter, approx. 200-2000 Hz
q  Discrete Pass band Tuning (DPT).
q  I.F- derived AGC with fast/slow/off control *.
q  Variable RF gain controls (actually IF gain useful in weak signal reception)
q  Switchable low noise pre-amp (14dB gain) and attenuator (20dB).
q  S-METER for signal strength indication.
q  Internal speaker, 2Watts dc controlled audio amplifier.
q  Low-noise analog variable audio filter approx. 600-4000 Hz *
q  12VDC Power.
q  Available as a DIY kit or fully assembled high quality components for reliable operation.

Components used
2N5109,J310,MC1350,SA602,NE5532,MAX293,AD9851,16F73 & TDA1013.
UNDER TESTING SEE THIS BLOG FOR UPDATE

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

2 comments:

  1. Sir,

    LRR-400 Kit Price ............


    VU3OKT (Dipak)

    ReplyDelete
    Replies
    1. Dear dipak,
      under testing.
      regularly see update in this blog.
      73,
      N.Ganesan

      Delete