RGO ONE - Noise blanker (NB) option by Boris, LZ2JR

RGO ONE is classic super heterodyne analog conversion SSB/CW amateur transceiver with 9MHz single intermediate frequency. Optional noise receiver/ noise blanker (NB) unit is placed right after post RX mixer amplifier U12 on RF MIXER board. NB module detects short incoming pulses and produces blanking pulse which neutralize disturbing interference signal early in the receive path just before first 9MHz (roofing) filter. Unlike all modern transceiver's technology where digital DSP technology is in use – in RGO ONE all the signals are analog processed avoiding signal distortion and improving signal dynamic range.

It is known that performance will be most effective when noise pulses are short in duration and comparatively long in period. Characteristic types are those produced by automotive ignitions, home appliances, small DC motors, pulse noises from power lines and other man made devices. Noise with short periods and longer duration such as QRN, are less discernible by the circuits and consequently more difficult to eliminate. Optional NB board works on RX and its location is on RF MIXER board in your RGO ONE.

Specifications:

 

- Pulse bandwidth 7 ÷ 70 µSec 

- Threshold/sensitivity 10µV ÷ 220µV 

- NB insertion loss/gain +1.5db (±1db) 

- Input frequency IF 9MHz 

- IF bandwidth 130kHz 

- Noise gate type PHEMPT Ga-As SPDT switch 

- Noise gate isolation >85db

If you are going to install your new optional NB module then I am highly recommending to follow step by step the NB Operating and Installation manual linked bellow by Boris, LZ2JR.

Just few more pictures from installation procedures follows.

JP1 jumper removed in the center of picture

RF Mixer board after removing the shielding on the left

NB optional module properly inserted to pins header

Securing the board with supplied M3mm screw and lock washer

After installation of the optional NB board the 2.40A revision or higher firmware must be installed to the RGO ONE transceiver.

 

This software version implements new optional NB module features.
NB noise blanker/noise receiver optional board gives ability to remove pulse noises from man-made home/industrial appliances, electrical power lines etc.

QRN and other atmospheric noises with long pulse duration might not be suppressed effectively.

New menu entries added:

1. Menu 35 nbP – Blanking pulse width 1 – 8 (7 – 70usec)
2. Menu 36 thr – Gate threshold/sensitivity level 1 – 16
3. LCD icon animation – NB icon can be lit on or off or fast blinking depending on NB module status
4. Module auto-detect – enables new NB features only if NB option is installed in the radio.

New firmware version 2.40A – NB functions added for download here.

NB Operation & Installation manual is available for download here.

Contact Boris, LZ2JR for availability or pre-orders here.

73 - Petr, OK1RP

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