Enable MIC and BAL input at the same time

  • 1
  • Question
  • Updated 2 years ago
  • Answered

I would like to have the BAL input on the rear of the unit open at the same time as the MIC input on the front, you may ask why.  I am using the front MIC for a headset and the rear BAL for a M110A hardware modem. Currently if I want to send M110A traffic, I must chose BAL, transmit from the modem, then back to MIC. On a busy MARS net, this can be a real issue. I could build a hardware solution but prefer to use the radio features if possible.


Flex 6500 running 1.9.13.173

Photo of Kg5dwx

Kg5dwx

  • 51 Posts
  • 4 Reply Likes

Posted 2 years ago

  • 1
Photo of Craig - KØCF

Craig - KØCF

  • 181 Posts
  • 61 Reply Likes

Could you connect the M110A modem to the computer sound card input, then route the sound card output to DAX in the PC? DAX and MIC can be used at the same time, albeit alternately. I am not at all sure that this is possible, but it was just a wild thought that might (or might not) work.

73,
Craig, KØCF

Photo of Kg5dwx

Kg5dwx

  • 51 Posts
  • 4 Reply Likes
Thanks, Will consider but adds a layer of distortion due to reprocessing .
Photo of Craig - KØCF

Craig - KØCF

  • 181 Posts
  • 61 Reply Likes

Actually, this is probably not true. The M110A will be digitized by your sound card, which will be the only analog processing. This signal will be passed as a digital bit stream to DAX, which goes digitally into a totally digital radio. There is no further analog processing after the sound card ADC. I have no qualms about operating RTTY with AFSK because of this. There is no effective difference between the Flex AFSK and "true" FSK in other (analog) radios.

73,
Craig, KØCF

Photo of George Molnar, KF2T

George Molnar, KF2T, Elmer

  • 1639 Posts
  • 599 Reply Likes
Would suggest using the AUX input (DB15hd connector) instead of the balanced input. Has TX/RX audio and PTT lines all in one connector. Having two hot mics at once is probably undesired since stray Shack noise could corrupt your data transmission. Craig's idea about DAX is also very good.
Photo of Kg5dwx

Kg5dwx

  • 51 Posts
  • 4 Reply Likes
Thanks, has the same issues as my current setup. I understand the issue of shack noise and a good comment.
Photo of Tim - W4TME

Tim - W4TME, Customer Experience Manager

  • 9178 Posts
  • 3525 Reply Likes
The short answer is no.  The radio is not designed to have multiple "mic" inputs active at the same time.  The only option is to use the audio input on the ACC connector, which can be used simultaneously with a mic input.