开云体育

Hello All,

?

QMX Mid band?

I am not getting but less than a .5 watts out with mic gain all the way up. this is going into a dummy load

input is on external mic, power is 9v for 9v build, mic is the one Hans has done the testing with brand new from Digikey.

CW works just fine 5 watts out on all bands

I ran the calibration in firmware 1_01_007 but have update to 1_02_000 to see if that would fix problem it did not.

Any suggestions as to where my problem could be.

?

thanks in advance

?

John Dunn

KJ4WSR

There is an option to test and set the mic level in the built-in test routine.?

Did you get the correct results, with mic gain </=55? ?/g/QRPLabs/wiki/38982#Microphone-gain

Per Hans, if you have to set the gain higher you will not get good results.

?

73, Don N2VGU

Don,?

?

Thanks for the response, I when through the Mic test and set the gain there and it looked like i had nice output.

I adjusted it to where it would go into the red just a little on a raised voice.

but when i go to use barely in output.

?

?

John Dunn

KJ4WSR? ?

John,? How are you determining your power output when using SSB?

--

73, Dan - W2DLC

Don,

?

I am using an MFJ-872 SWR/Wattmeter between the tuner and antenna.

?

?

John Dunn

KJ4WSR?

On Sat, May 3, 2025 at 03:45 PM, Daniel Conklin wrote:

John,? How are you determining your power output when using SSB?

What is your sound source for the power test?? Many/most non-peak power meters will not follow speech peaks well.?

Try whistling, saying "ahhhhh", or playing an appropriate audio tone from your computer speakers (best) or whatever into the mic, to get a continuous, steady(ish) output.

?

73, Don N2VGU

Don,?

?

I dug out another dummy load and connected my ic 705 to see if it would pick it up dummyload to dummy load and it does.

So maybe my wattmeter is just not sensitive enough.

?

Well i will put this nice little rig on the air and see how it goes with ssb.

?

?

John Dunn

KJ4WSR?

Don,

?

thank you very much,

it helps to bounce ideas off someone else to get the little gray cells working.

?

it was working all along i just was not giving it the continues signal to get the needle moving.

?

Thank you again,

?

73, John Dunn

KJ4WSR

Hi It is always best to use an audio signal generator internal or external, SSB is alwyas tricky with speech, 5 Watts is very much QRP, so you need a HF Watt meter that is 10 Watts full scale deflection. The Watt meter also needs to have a peak envelope power meter circuit. Most MFJ power meter use a simple capacitor to smooth out the the damping on the meter.

?

KR

?

Andrew

On Sat, May 3, 2025 at 10:24 PM, <jctgdunn@...> wrote:

I am using an MFJ-872 SWR/Wattmeter between the tuner and antenna.

Shouldn't it be between the tuner and the transceiver ? Wattmeters tend to be calibrated at 50 Ohms.

?

Yannig - F4IUJ