Thanks for writing, Lyle.
I am curious, then, why the (K3) SSB signal is routed through a crystal
filter. Is it purely a belt and suspenders approach to enforcing a limit
on the bandwidth of the transmitted signal?
Brian K1LI
--
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The 15 K Hz signal from the DSP is a SSB signal.
This is the second IF frequency (from the antenna side).
When this is mixed with the 8.230 Mhz in you
end up with the sum and difference with the 15KHz:
Namely 8.215 and 8.245 MHz.
The 8.215 MHz filter is used to remove the
unwanted 8.245 MHz
The schematics show two internal crystal filters:
one on the receive path (2 poles) K3 RF Board
It's marked BW 14 kHz. 8215.0 KHz.
This has no relay to bypass it.
one on the transmit path (4 poles) KREF3 REF/2ND TX IF
It's marked 8215.0 kHz, BW=4 kHz
This has a relay to move to bypass it.
Hi Larry,
The schematics show two internal crystal filters:
one on the receive path (2 poles) K3 RF Board
It's marked BW 14 kHz. 8215.0 KHz.
This has no relay to bypass it.
This is used to further suppress the 2nd-IF image response at 8245 kHz. It has
essentially no ripple and thus no
I would like to know how the K3 and the KX3 generate SSB. Does the DSP
generate DSB which is then filtered by the IF crystal filter, or does the
DSP generate SSB which is then cleaned up by the IF filter.
K1LI
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In the K3, the DSP generates an SSB signal at 15 kHz.
In the KX3, the DSP generates an I and Q stream which combines to create
SSB in the quadrature baseband-to-RF mixer.
73,
Lyle KK7P
I would like to know how the K3 and the KX3 generate SSB.
More generally, I think you will find that all SDR radios generate SSB
by what would be called the phasing method in analogue radios, rather
than the filter method.
--
David Woolley
Owner K2 06123
On 10/05/14 17:15, Lyle Johnson wrote:
In the K3, the DSP generates an SSB signal at 15 kHz.
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