- Digital Hybrid Wireless® (U.S. Patent #7,225,135)
- SmartSquelch™
- SmartDiversity™
- SmartTune™ for auto frequency selection
- 256 selectable UHF frequencies
- RF-controlled digital noise filters
- Low noise, Robust RF Front End
- DSP-based pilot tone
- Graphics type backlit LCD display
- Independent balanced XLR and unbalanced 1/4-inch audio outputs
- Compatiblity modes for use with analog transmitters
The R400a is a high performance, triple-conversion, frequency synthesized, UHF receiver fully compatible with all Lectrosonics 400 series transmitters, and a number of analog models. The proprietary audio processing includes a DSP (digital signal processor) for very low distortion and a superior signal to noise ratio. The DSP eliminates a compandor and its artifacts to provide exceptional audio quality when operating in its native hybrid mode. Special DSP algorithms also provide compatibility modes for use with Lectrosonics 100 and 200 Series analog transmitters.
The R400a features a powerful menu-driven LCD graphic display operated with a push-button switch and a dual function rotary encoder control as a convenient means of viewing and altering settings. The LCD main window displays the pilot tone indicator, diversity antenna activity, RF and audio levels, operating frequency, transmitter frequency switch settings and transmitter battery status. Settings can be changed using the MENU functions. A built-in RF spectrum analyzer is included to conduct site surveys to find interference-free operating frequencies. The analyzer quickly tunes the receiver across its 256 frequencies and records a marker on the LCD indicating the strength of any RF signals picked up. Within less than a minute, a complete display is generated showing the RF activity across the entire tuning range of the receiver. An area with little or no RF activity is then easy to locate and select.
This model is not capable of firmware updates in the field so no files are available for download. Contact Lectrosonics if you need a firmware update.
R400a Firmware History
This model is not capable of firmware updates in the field so no files are available for download. Contact Lectrosonics if you need a firmware update.
R400a v1.7 – 14 October 2022
- Fix bug causing frequencies chosen with Smart Tune to be “forgotten” after cycling power (not stored to non-volatile memory).
R400a v1.6 – 01 November 2018
- Add “Nu Hybrid” compatibility mode for use with newer digital hybrid transmitters.
R400a v1.5 – 03 July 2013
- Enhanced squelch system to be immune to high intensity supersonic content in the audio.
- Improved dynamic tracking accuracy in compatibility mode 6.
R400a v1.4 – 16 May 2012
- Applied sonic refinements to mode 3. Improved response to sharp acoustic transients.
- TX battery status now more accurate for lithium batteries.
R400a v1.3 – 21 February 2008
Added block 944. Will be a separate build, labeled r400a_900mhz.hex.
R400a v1.2 – 21 February 2008
Added low blocks 470, 19, and 20.
R400a v1.1 – 15 August 2005
- Added compatibility mode 6.
- Dynamic noise reduction (DNR) now driven by supersonic noise, not RSSI level.
- Out of range window detector voltage no longer forces the receiver to squelch once a signal has been acquired. However, it remains true that an in-range window detector voltage is required for a squelched receiver to *unsquelch* when a carrier is present.
- SmartTune function now disabled when controls are locked.
R400a v1.0 – 11 April 2005
First production release.
R400a/E02 Firmware History
This model is not capable of firmware updates in the field so no files are available for download. Contact Lectrosonics if you need a firmware update.
R400a v2.1 – 21 July 2015
Highest frequency in Block 27 was moved from 713.8 MHz to 713.9 MHz.
R400a v2.0
First production release.
R400a/E02-779 Firmware History
This model is not capable of firmware updates in the field so no files are available for download. Contact Lectrosonics if you need a firmware update.
R400a/E02-779 v1.2 – 27 August 2013
- Corrected FM deviation level in audio compatibility mode 3.
- Make squelch system immune to high intensity supersonic content in the audio.
R400a/E02-779 v1.1 – 19 January 2011
- When generating a tone on one output (balanced or unbalanced), the other output will now remain squelched.
- Fixed a bug that resulted in perceived RSSI level differences between the main screen and the scan screen.
R400a/E02-779 v1.0 – 14 September 2010
First production release.
Awards & Reviews
