The OpenHPSDR folks have achieved 20dB improvement in IMD on their DDC/DUC
rigs via dsp techniques:
http://www.n9vv.com/Images/Apache-Labs/PureSignal.pdf
73, Barry N1EU
On Thu, Apr 24, 2014 at 12:13 PM, Bob McGraw - K4TAX <RMcGraw@blomand.net>wrote:
> Well it can be either or both. Certainly the cleanest amp will only
> amplify what is provided to its input. It typically won't get any cleaner.
> Now take an amp that has IMD issues or one that is tuned incorrectly and
> the cleanest exciter / amp combination will get nasty.
>
> The results Rob found and reported is somewhat typical of radios today.
> Some are worse, some are better and the IMD is likely to vary by band just
> as he reported.
>
> How do we keep the radio makers from not blaming the amp.......just
> measure the radio as a stand-a-lone item. The numbers are the numbers.
>
> 73
> Bob, K4TAX
>
>
>
>
> ----- Original Message ----- From: "K8JHR" <jrichards@k8jhr.com>
>
> To: <k9yc@arrl.net>; "Discussion of Ten-Tec Equipment" <
> tentec@contesting.com>
> Sent: Wednesday, April 23, 2014 10:02 PM
>
> Subject: Re: [TenTec] OT: Rob Sherwood's impression of the FLEX 6x00
>
>
> Not an argument... but a question: How do we know it is
>> the transceiver and not the amp in a given case?
>>
>> Reason for asking, is I anticipate the transceiver makers
>> blaming the amp market for it. Is there a way to decide, or
>> do we have to run each barefoot and then with an amp? or what?
>>
>> Again... not an argument... a question on how to keep the
>> rig makers from saying the amps are the fault.
>>
>> ----------------- K8JHR -----------------------
>>
>> On 4/23/2014 10:49 PM, Jim Brown wrote:
>> I often see signals
>>
>>> that are so broad that they are in violation of FCC Rules for spurious
>>> emissions by a wide margin. I've also got an HP spectrum analyzer.
>>>
>>> _________________________________________________
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>>
>>
>
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