Hi Bob,
Thanks for your message. I was hoping for some form of engineering
mode to modify this.
I used SpectrumLab as audio signal generator and a R&S FPC1500
spectrum analyzer. In USB works nicely (I checked my setup with a K2
and an Afedri SDR receiver as well) but in AM the carrier appears at
approximately - 600 Hz.
I'll perform the Master Reset as suggested.
73,
Carlos VK1EA
On 10/7/18, Bob McGraw K4TAX <rmcgraw@blomand.net> wrote:
> Carlos:
>
> The frequency determining values and math are written in firmware.
> There are no adjustments.
>
> The only adjustment related to frequency is for the master oscillator
> being U8 {GTXO_566}. I suggest you perform a Master Reset and then
> remeasure your radio. CW mode and AM mode should be the same
> frequency. As to SSB mode, LSB and USB, I presume you have means to
> actually measure the suppressed carrier frequency and not just "tuning"
> the radio to what sounds correct.
>
> 73
>
> Bob, K4TAX
>
>
>
>
> On 10/6/2018 7:56 PM, Carlos wrote:
>> Hi,
>>
>> I noticed that the AM carrier (in 10 meters at least) is almost 600 Hz
>> lower than the supressed carrier in USB. So in USB the radio is almost
>> spot on, but in AM the carrier appears shifted to the left.
>>
>> I checked with some testing gear (less than one year old, still
>> calibrated) and one SDR receiver. I'm not dreaming it.
>>
>> I have the user manual and the schematics, but I cannot find any
>> procedure to adjust the position of the AM carrier.
>>
>> Any help is greatly appreciated.
>>
>> 73,
>> Carlos VK1EA
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>>
>
>
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