Hi Barry,
You are absolutely right. I have been using the Corsair to monitor
local traffic in 40 meter, where signals are so strong that any
off-frequency parasitic response due to the spurious tones generated
in the DDS seem to be negligible.
What I'll do next weekend is to make proper screen captures of the
spectral distribution of the 5 MHz PTO Vs. the 5 MHz DDS. The stuff I
have at home does not have much dynamic range (probably 75 dB at
best), but I'm sure that the differences are easy to notice.
73,
Carlos VK1EA
On 6/11/18, Barry N1EU <barry.n1eu@gmail.com> wrote:
> FWIW, the PTO has a MUCH cleaner spectrum - noticeably lower transmit and
> receive spurs.
>
> You can easily see this if you put the PTO vs. DDS Corsair in transmit mode
> and look at the signal on an SDR.
>
> Barry N1EU
>
> On Mon, Jun 11, 2018 at 9:29 AM, Carlos <carlos.peco@gmail.com> wrote:
>
>> Hi,
>> I asked about this some months ago, maybe somebody has seen something
>> in the meantime.
>>
>> I bought a Corsair II; I'm impressed with how it works, really simple
>> and functional, I don't get tired of it. A cheap DDS from ebay keeps
>> it on frequency without the limitations of the PTO.
>>
>> The thing is that all main knobs (including the tuning one) are
>> aftermarket. They look wrong on a Ten-Tec.
>>
>> Any idea/hint on where to find the right knobs, or at least closer to
>> how they should look like?
>>
>> Many thanks in advance,
>> Carlos VK1EA
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