KDSP2 vs BHI

[Nick Waterman]

I'm considering which DSP option to go with - KDSP2 or one of the BHI
noise-eliminating speakers. They're both AF DSP solutions, the cost is
similar, but that's moreorless where the similarities end. I've
attempted to collect the other pros and cons...

BHI:
  Plug in, it works.
  can be used with any radio, not just the k2
  only one control - easy to tweak
  I don't have to build it.
KDSP2:
  I get to build it - satisfy my solder smoke cravings!
  lots of parameters to tweak (is this an advantage?)
  internal - nice and small
  Low current draw (60mA vs BHI's 500mA - ouch!)

... but I've not managed the all-important listening test.

Any of you fine gents tried both, and able to objectively compare?
Obviously the Elecraft Reflector's not the most ideal place for an
unbiased opinion, but hey...   :-)

--
"Nosey" Nick Waterman, G7RZQ, K2 #5209.
use Std::Disclaimer;    [hidden email]
Hot glass looks same as cold glass. (Cunino's Law of Burnt Fingers)
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[KK7P]

Hello Nick!

Since you already realized I am biased... :-)

External, no-control, DSP speakers usually have the following issues:

For SSB:

Notch filter has delay of a second or so.  A carrier tuning up nearby
will be at full strength for a significant fraction of a second before
it is suppressed.  This is to allow copying CW with no controls.

The KDSP2 is very, very quick at suppressing such tones.

For CW:

Unless the unit in question has a separate input for keying sidetone
(and note that the K2 does not have a separate output for this), the
transmit sidetone from the K2 will be delayed by the filtering in the
DSP.  This can make sending CW awkward.

The KDSP2 is not in the K2's CW sidetone audio path, so there is no
additional delay added.

73,

Lyle KK7P

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