SSB Microphone Settings (feel free to share yours)
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I realize that settings are dependent on microphone, voice characteristics, etc.? but I thought I would publish my current settings that are seeming to work at the moment.? ?Power output is very dependent on controlling the microphone distance within an inch.
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Transmit EQ? No? (Don't even want to mess with more variables at the moment)
Mic AGC On Yes
Max gain 10
Hold time 10
Recovery 10? ?(If this is set too low AGC will recover too quickly and your power output will be all over the map)
Mic. gain 55
Mic compression 0
Mic. noise cncl. On
Mic. noise gate ON
Threshold? 95
Samples 100
Attack slope 10
Vox OFF
Drive Level 900? ?Default
CESSB? On ? ? ? ? ? Default
Phase predistort ON ? ?Default
Ampl. predistort ON ? ?Default
Ampl. PD thresh 70 ? ? Default
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Brien - KE7WB |
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On Thu, Mar 20, 2025 at 08:25 PM, Stan Dye wrote:
Stan, Thanks for the expanation.? I think that makes sense; the AGC is asserting itself to long to allow variations in amplitude to cause the power output to change rapidly and the meter responds accordingly.Brien - KE7WB |
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Brein, Your settings are nearly identical with what I arrived at except that I did engage EQ, but it isn't really necessary unless you change the TX filter upper and lower limits.? With a flat response Mic, there is too much at 250 Hz and this is typical on every radio I've ever tested, traditional heterodyne type or SDR.? Too much 250Hz will give slightly muddy audio, but if the?lower limit?is kept at 300Hz, there are no worries.? Moving the?upper limit up to 2900 seems fine, with very pleasant audio,?when band conditions allow.? Obviously for best "talk-power" you'll keep it narrower. For those looking for easy Mic solutions, there are likely plenty in most of our old radio parts bins.? Here are some tips from the 15 years since I retired,?of doing this?for Ham Radio headsets. Boom-Mic Headsets or handheld Electret Mics intended for today's handheld devices the Mic output should be low enough not to overdrive the?ADC in these devices and should work fine on the QMX.? I saw no need to raise the?Mic Gain above 50, but I didn't see appreciable distortion going as high as 60 or even 70, when using the?Mic as it was designed.? Noise-Cancelling Communications Mics are operated directly in front?of the?lips 1/8" away.?? Many fixed boom Mics on consumer electronics headsets may have far more output (lack acoustic noise canceling) and are not near your mouth, so care has to be taken not to overdrive the radio and or pickup more outside noise.? Hans' internal Mic noise cancellation is quite unique for any Ham Radio.?? Those Mics designed for early PC Sound Cards (they have stereo Mic inputs on any I've ever seen for PCs since the?1980s as they are being used for music recording) always supply Mic BIAS on the Mic + line Tip and Ring for 2 Mics) and those early ones expected a lot of Mic output.? Virtually all late PC sound cards (no longer cards, now builtin to chip sets) expect much lower Mic output (compatible with modern handheld?devices) and have 10/20/30 dB Mic Boost after the ADC.?? The headset to USB Sound cards usually don't have any Mic Boost Control.? It's possible but requires software to support it with every OS fully supporting the USB HID (Human Interface Device) specification. I don't see this radio being a candidate for remote operating, it kinda spoils the point of a pocket sized radio, and a PC for HRD is another piece of gear to tote up the mountain. I use a lite paper log book. Speaker Mics for handhelds (particularly?early ones 1980s to 2000) may have much more output and you'll need to back off the Mic Gain.? Also remember that Speaker Mics for Handheld radios key PTT very differently.? Yaesu and ICOM shunt the Mic with a specific value resistor to effect PTT and shunt with different values to Scan Up or Scan Down.? Kenwood simply ties the Mic- to Headphone Common Ground to key PTT probably why?the Kenwood interface is the most copied (and Kenwood hasn't changed this most popular interface in decades).? The Kenwood, Icom, and Yaesu/Standard Vertex all have some very different interfaces for their commercial handheld radios because the connectors are screwed to the?side of the?radio.? If you're looking to modify any speaker mics for your QMX, look up the Speaker Mic schematic online.? ? A Ham in the UK has provided most of these schematics.?? OK, back to work... Dave WI6R On Thu, Mar 20, 2025 at 8:00?PM Brien - KE7WB via <ke7wb=[email protected]> wrote:
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Brien - KE7WB
Dave WI6R