Flex SDR panadapter

[Gary Gregory-2]

Listening to a Flex operator making assertions that the k3 exhibited USB spurs, 3khz above the 7.120 frequency being used.
I am curious to hear from the learned group here.
The k3 in question was using the upgraded synthesizer.
Gary
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[Richard Fjeld-2]

Maybe, but consider that some SDR pan adapters exhibit false images if
not properly 'set up'.  I can't think of a better description for it.

Dick, n0ce


On 9/23/2016 9:51 PM, Gary wrote:
> Listening to a Flex operator making assertions that the k3 exhibited USB spurs, 3khz above the 7.120 frequency being used.
> I am curious to hear from the learned group here.
> The k3 in question was using the upgraded synthesizer.
> Gary
>

--
 

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[Guy Olinger K2AV]

For listening for weirds on my own TX signal, I use my internal battery
K2/10, connected to *nothing* else and using internal speaker.

This was very helpful a while back when I was accused of transmitting key
clicks with my K3/8410 combo. Accuser also said I was 30 over 9 at his
place. Locals could not hear them. But I *could* with my K2.

Did not hear them if I switched to my 3-1000Z amp. Trouble turned out to be
the electronic bias setting in the 8410, which reduces finals idling
current when not actually transmitting RF. I dialed back that setting until
the "mild" clicks went away on my K2. Now cuts down some on idle current,
but not nearly so much and no discernible clicks in my K2.

Basic K2/10 with internal battery is a very useful instrument.

I once used it with a rubber ducky to find a break in a stretch of buried
RG6. Got it to within a few inches, with 5 watts from the owner's K3 on the
line steady. Had been stretched to snapping center conductor when a tractor
drove over it when ground was saturated by days of rain.

73, Guy K2AV

On Sat, Sep 24, 2016 at 1:06 PM, Ron D'Eau Claire <[hidden email]> wrote:

> If you don't have a second receiver in the shack to listen for yourself,
> how
> about asking someone else to listen for the spur?
>
> If you use a local receiver, be sure it has a dummy load connected and the
> main signal on the intended frequency is NOT overloading it - a maximum
> reading of 10 or 20 dB over S-9 is a good top limit. Too much RF can
> produce
> lots of false signals in the receiver.
>
> 73 Ron AC7AC
>
> -----Original Message-----
> From: Elecraft [mailto:[hidden email]] On Behalf Of
> Richard Fjeld
> Sent: Friday, September 23, 2016 11:07 PM
> To: [hidden email]
> Subject: Re: [Elecraft] Flex SDR panadapter
>
> Maybe, but consider that some SDR pan adapters exhibit false images if not
> properly 'set up'.  I can't think of a better description for it.
>
> Dick, n0ce
>
>
> On 9/23/2016 9:51 PM, Gary wrote:
> > Listening to a Flex operator making assertions that the k3 exhibited USB
> spurs, 3khz above the 7.120 frequency being used.
> > I am curious to hear from the learned group here.
> > The k3 in question was using the upgraded synthesizer.
> > Gary
> >
>
> --
>
>
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