On Oct 26, 2023, at 10:51, Dave via groups.io <n0eds@...> wrote:

?Hi Kai,

Like you I went after the mic audio first. My use for this radio is much different than most it would appear. I’m looking for one bug out radio that will receive everything. The fact that it transmits is a real plus. I want small, light and no frills that can be deployed and run off any voltage source regardless of voltage. This is it if it worked.

So I chose the small cheaper mic because it is simple, light and small. Upon taking it apart I found that it was an electric cartridge, good. But it was to small for the mold hole in the mic and with no hole for the audio to get in. No padding at all leads to the audio having to go through the speaker grill and wander around until it finds it’s way into the echo chamber with the mic element. I replaced the mic with a Motorola mic that was the correct size but the Leeds did not match up perfect so some adjustments were made to the housing. I drilled a hole in the mic so audio could reach the mic and lined it all with felt. I don’t think replacing the mic is necessary as the problem was the echo chamber it was in. I further put a variable resister across their swamping resister so I could adjust the gain of the electric mic. Mic sensitivity if you will. This made the mic sound pretty good! No money spent! I also cut the internal speaker loose and removed making it even lighter.

Now I had a good sounding cheap, light mic.?

Looking at the SSB wave form on the oscilloscope showed that the out put of the radio was cutting the center line and flat topping! Tried adjusting everything I could to no avail. I decreased the cartridge gain, in the mic, until I had a perfect wave form! Then looked at the watt meter. Hardly any power out. As soon as I increased the mic level it would flat top. A check of AM/FM and they were very low and unusable. Back to SSB. The circuit that controls this is the ALC, automatic level control. I did update the firmware? Could that have caused the ALC to not work? That was the big problem with the last two I bought. I probably have notes on what was wrong with the first one. So I returned them and ordered another one. Been waiting almost a month and the due date came and went. I inquired about it being late and started a storm? They refunded my money and said I cause much trouble for store? I just wanted to know if everything was ok? They now don’t know where it is but said I could still buy if it showed up someplace? WOW!!

I’m waiting for someone to say,” hey bone head did you check the……..?”

Thank you for input. I have a pair of G90’s that work pretty good. Other issues there but are useable. Great tuner and easy to use but no VHF. That is where most public safety is. So then need a second radio to monitor them. Back to square one.

Dave Bohlen

On Oct 26, 2023, at 12:23 AM, Alf <dg8yhh@...> wrote:

Hi Kai,
Maybe an webrx Like Kiwi/websdr or openwebrx is an Option to Control and record the audio ... If you near JO32 I can send you an Link to some of Theme

Am 26. Oktober 2023 00:19:51 MESZ schrieb Kai <kai@...>:

I tested again this evening. The gain setting did work with SSB on VHF. I started with the same setting as it was on the recording. There I got the feedback that there is overdrive. After reducing the gain, the overdrive was gone and audio was good. I did not test the cmp setting. I plan to get an USB SDR receiver. Then I can do some more testing and listen to the signal myself and record it. I have no other HF/SSB receiver.

The test was done with my self made amplified mic though.

What microphone are you using? I did a comparison with the original mic and my amp mic on VHF WFM yesterday. Even at same gain setting and the output of my amp mic adjusted to get the same volume, the original mic had some kind of cracking noises in the transmition while it was clean audio with my amp mic. I suspect that the Q900 does only work well with an amplified mic at this point.

I have V4 with firmware 3.4.1

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