flex 6400 with two mics

Gene - K3GC · June 2020

Can two mics be attached simultaneously to my flex 6400. I presently have a radiosport attached ti the female 1/8 and a male RCA to the PTT . I would like to add the HFM2 via a 1/8 splitter and the PTT. Both mics would be attached simultaneously. That way I would not have to be crawling behind the rig every time I wanted to change mics.
Is this doable or am I about to enter feedback **** of one sort or another

Dan-N7HQ · June 2020

We would not recommend that method - there could be impedance and signal loss issues with a Y connection.

A far better method is to connect your microphones to a small mixer and send the output of that to the line-level input on your FLEX-6400. There are a number of such products, but you will need to make sure they are not susceptible to RFI.

I use a mic preamp combined with a line-level mixer to accomplish what you are describing. The line mixer has two discrete outputs that allow me to mix every device with an audio output to my shack speakers and two microphones + any other source to several radios.

73,
Dan, N7HQ

WK2Y · June 2020

And perhaps other might be able to recommend mixers that are not susceptible to RFI?
Thanks and 73,
Bob

K0FLY · June 2020

Gene:

I have not done what you are asking, but I would try this approach,

Connect FHM-2 (needs bias) to the MIC " input and the Radio Sport Mic to the "Line" input (accessory connector).

The mic connected to the 'LINE" input will need an external audio amplifier to bring the input level up to -10dBv which is required by the radio. Select which mic to use with SSDR. Velleman kits makes a audio preamp that should increase the signal to the required level, it costs $11 (Part number K1803).

The accessory connector also has a PTT input pin.

Gayle K0FLY

flex 6400 with two mics

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