[TenTec] Tentec Audio fidelity doubt

[Chang Song]

wow.. thank you for your reply.
i will try that powered speaker route.
I noticed the digital audio artifacts when I dial VFO with a headphone.
sometime it bothers me since it interfere with weak signals.

so in the end, we need to reroute the audio path and replace the capacitor.

And also i was wondering what sort of ACC1 + SMA connector you are using?

thank you very much.

Sent from my iPad

> On Jul 22, 2020, at 3:49 PM, Carlos PECO BERROCAL <carlos.peco at gmail.com> wrote:
> 
> Hi,
> I found the same issue when I bought my Argonaut VI, I posted about it here
> in the Ten-Tec list back then.
> 
> In my case, it was (and still is, as I haven't fixed it) the audio
> amplifier. It might be the amplifier itself, or the large electrolytic
> capacitors within.
> 
> In the meantime, buy/make a cable to get the audio from the auxiliary
> connector and take it to a powered speaker. HOWEVER, please note that the
> level on that connector is a blast for most powered speakers, so in my case
> I had to add an attenuator.
> 
> Additionally (and only if you are young and with very sensitive hearing)
> you might notice some weak digital audio artifacts there, only noticeable
> in quiet bands and only on certain frequencies, or when you move the dial
> up and down. If you analyze the schematics you'll notice that the DSP board
> has two audio outputs: one goes to the auxiliary connector and the other
> one goes to the audio amplifier. Well, in my case I found that the one
> going to the audio amplifier was noisier than the one going to the
> auxiliary connection, perhaps it has to do with PCB track routing. I just
> cut a track and patched the audio amplifier to the "quiet one".
> 
> Your mileage might vary as we might have different revisions of the PCB,
> and/or different firmware.
> 
> 
> BTW, were you the one asking about the 9 MHz output? I have an SMA
> connector in there. It works, but the frequency response is not flat and on
> top of that you'll see the leakage from the second IF mixer (the one that
> downconverts to the DSP-IF. Happy to take some screenshots with my spectrum
> analyzer. However, the "click and tune" feature works (SDR Console V3 with
> RFSpace SDR-IQ receiver).
> 
> 
> In summary: get a powered speaker and hook it to the auxiliary output,
> after attenuating it a bit. It is a very nice radio, very quiet (what you
> hear in the speaker is mostly band noise, and not noise generated by the
> radio itself) and I don't get tired of it. I understand that you compare it
> with your 7300, but they are different things.
> 
> 
> 
> 73,
> Carlos VK1EA
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
>> On Wed, Jul 22, 2020 at 3:23 PM Chang Song <tru64ufs at gmail.com> wrote:
>> 
>> Hello, folks.
>> 
>> I have heard so much about Tentec's legendary audio fidelity, I decided to
>> purchase a Tentec Argonaut VI.    I mostly use SSB.
>> 
>> I also have an IC7300.
>> 
>> From the moment I started using it, I realized that the voice came out from
>> the speaker
>> and the headphone jack on the Argonat VI is very very mushy.
>> Adding to the fact that it does not have spectrum scope.
>> I can hardly understand voice with moderate signal level while on IC7300,
>> even weaker signal, I can clearly understand voices.
>> 
>> Is this normal for TenTec?   Or the audio fidelity applied only to CW..
>> although
>> I don't think it is better than IC7300 either.
>> 
>> 
>> 
>> --
>> Chang Song
>> _______________________________________________
>> TenTec mailing list
>> TenTec at contesting.com
>> http://lists.contesting.com/mailman/listinfo/tentec
>> 
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