K3 Panadapter / SoftRock

[Don Rasmussen]

Question:

Is it really as simple as changing the crystal in the
SoftRock 40 from 7.038 to 8.215 to provide a band
scope for the K3? Seems too easy. I use the "Rocky"
program to manage the display.

Wondering if 8.215 would provide the 48khz segment
centered properly in the computer display window.

Also wondering what the best source of a single 8.215
crystal for this purpose would be?

Anyone else on the list having SR 40 and wanting to
make a group order for these?


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[W2AGN-2]

Don Rasmussen wrote:

> Question:
>
> Is it really as simple as changing the crystal in the
> SoftRock 40 from 7.038 to 8.215 to provide a band
> scope for the K3? Seems too easy. I use the "Rocky"
> program to manage the display.
>
> Wondering if 8.215 would provide the 48khz segment
> centered properly in the computer display window.
>
> Also wondering what the best source of a single 8.215
> crystal for this purpose would be?
>
> Anyone else on the list having SR 40 and wanting to
> make a group order for these?
>

I have one of the original softrock 40s and was also wondering about this.


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[Leigh L. Klotz Jr WA5ZNU]

Or order a new SVR5 on the K3 IF.
Leigh/WA5ZNU
On Tue, 15 May 2007 9:27 am, W2AGN wrote:
> Don Rasmussen wrote:
>> Question:
>> Is it really as simple as changing the crystal in the
>> SoftRock 40 from 7.038 to 8.215 to provide a band
>> scope for the K3?
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[KK7P]

> Is it really as simple as changing the crystal in the
> SoftRock 40 from 7.038 to 8.215 to provide a band
> scope for the K3? Seems too easy. I use the "Rocky"
> program to manage the display.

You do NOT want an 8.215 MHz crystal (or 4 x 8.215 MHz) for the softrock if
you attach it to the IF pickup of the K3 for a bandscope.  The softock has
very little isolation of the L.O. to its antenna input, and you'll inject a
lot of energy directly into the IF of the K3.

You want the softrock injection on the LOW side of 8.215 MHz.  I can't tell
you what the best frequency might be because I don't know, but I suspect 8.200
or thereabouts.  You may also want/need an isolation amplifier to ensure the
reverse coupling back into the K3 is at a very low level.

73,

Lyle KK7P
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[Bill VanAlstyne W5WVO]

This brings up a question I asked a while back, and I don't think it made it
into the FAQ. In a dual-receiver K3, does the IF pickup port reflect the IF of
only the main receiver? Is it switchable between receivers? Or is there a
separate IF port on the subreceiver?

Bill / W5WVO

lyle johnson wrote:
> You do NOT want an 8.215 MHz crystal (or 4 x 8.215 MHz) for the
> softrock if you attach it to the IF pickup of the K3 for a bandscope.
> The softock has very little isolation of the L.O. to its antenna
> input, and you'll inject a lot of energy directly into the IF of the
> K3.


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[KK7P]

On Tue, 15 May 2007 12:07:36 -0600
  "Bill W5WVO" <[hidden email]> wrote:
> ...In a dual-receiver K3, does the IF pickup port reflect the IF
>of only the main receiver? Is it switchable between receivers? Or is there a
>separate IF port on the subreceiver?

Currently, the KXV3 provides one jack for an internal cable to either the main
or the sub receiver's buffered IF output.  We're looking at the practicality
of making this selectable.

73,

Lyle KK7P
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[Simon (HB9DRV)]

Ideally I can run two Panadapters, one for each RX. In the real world I
expect I would only use one with it connected to the sub RX.

Simon Brown, HB9DRV

----- Original Message -----
From: "lyle johnson" <[hidden email]>

Currently, the KXV3 provides one jack for an internal cable to either the
main
or the sub receiver's buffered IF output.  We're looking at the practicality
of making this selectable.

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