SmartSDR v3.9.18 and the SmartSDR v3.9.18 Release Notes
SmartSDR v2.12.1 and the SmartSDR v2.12.1 Release Notes
Power Genius XL Utility v3.8.9 and the Power Genius XL Release Notes v3.8.9
Tuner Genius XL Utility v1.2.11 and the Tuner Genius XL Release Notes v1.2.11
Antenna Genius Utility v4.1.8
Need technical support from FlexRadio? It's as simple as Creating a HelpDesk ticket.
Flex6000 series microphone electrical options, including FHM-3
I'm working on some audio interface hardware to work with Flex radios (and others.) I'm seeing two very different signal levels coming out of two microphones that I expect to be very similar:
* FHM-3, stock hand-held mic that came with my Flex6400.
* A "PC Gaming Headset." Mic+ and Ground on the headset, wired directly to Mic+, and both Mic- and Ground on the Flex mic port.
They're both electret microphone elements, both require the "DC Bias" turned on. But the FHM-3 requires the "+20dB Boost" and still has the Mic Gain set to around 60% to sound right.
The HEADSET, with +20dB Boost enabled, I have to turn the Mic Gain all the way down to 0, and it's still compressing a fair bit. The output from the FHM-3 is A LOT lower than the output from the straight electret mic element in the headset.
Looking inside the FHM-3, there is a resistor divider (and some filter caps, but I don't think they're impacting this) that's cutting the DC bias voltage across the Electret element down to .7vDC, which is AWFULLY low. That'll lower the gain a lot. Between the lower DC bias actually across the mic element, and the voltage divider itself, that would explain why the FHM-3 has such a low output.
It's acting like the FHM-3 is trying to have the output of a dynamic mic, but still requires the DC bias voltage of an electret mic.
WHY is this? Does anyone know?
Leave a Comment
Categories
- All Categories
- 325 Community Topics
- 2.1K New Ideas
- 589 The Flea Market
- 7.8K Software
- 6.2K SmartSDR for Windows
- 165 SmartSDR for Maestro and M models
- 393 SmartSDR for Mac
- 260 SmartSDR for iOS
- 246 SmartSDR CAT
- 178 DAX
- 368 SmartSDR API
- 9K Radios and Accessories
- 14 Aurora
- 149 FLEX-8000 Signature Series
- 7.1K FLEX-6000 Signature Series
- 906 Maestro
- 50 FlexControl
- 854 FLEX Series (Legacy) Radios
- 865 Genius Products
- 444 Power Genius XL Amplifier
- 307 Tuner Genius XL
- 114 Antenna Genius
- 273 Shack Infrastructure
- 193 Networking
- 437 Remote Operation (SmartLink)
- 135 Contesting
- 715 Peripherals & Station Integration
- 135 Amateur Radio Interests
- 936 Third-Party Software