[prev in list] [next in list] [prev in thread] [next in thread] 

List:       elecraft
Subject:    RE: [Elecraft] K3: pseudo KRX3 "free" via LP-Pan+Power SDR
From:       Jerry Flanders <jeflanders () comcast ! net>
Date:       2008-07-31 17:57:48
Message-ID: 6.2.5.6.0.20080731135421.03f4ab48 () comcast ! net
[Download RAW message or body]

Only time I would use PowerSDR for listening is when I want AM or FM. 
I don't have either crystal filter in my K3 and PowerSDR is extemely 
good on AM receive. Haven't tried FMn, but  expect the same there. 
Also, DRM receive is possible for those who want it.

Jerry W4UK

At 12:44 PM 7/31/2008, Brett Howard wrote:
>Ok then...  This is pretty much exactly what I expected and makes perfect
>sense.  Thanks Larry...  I have to admit that after seeing that video that
>the LP-PAN/PowerSDR kit is more than I'd originally thought but you do have
>to give up a bit in order to use it that way.  Cool thing is that you only
>give it up while you operate in that fashion.  As soon as you go back to
>using the rig directly and using the panadapter as a panadapter (rather than
>a lot of the rig) all of the K3 happiness is back.
>
>Very cool gentlemen!  Its exciting to see how quickly people are jumping on
>to make products for the K3 that work so well so soon!
>
>-----Original Message-----
>From: elecraft-bounces@mailman.qth.net
>[mailto:elecraft-bounces@mailman.qth.net] On Behalf Of Larry Phipps
>Sent: Thursday, July 31, 2008 8:25 AM
>To: elecraft@mailman.qth.net
>Subject: Re: [Elecraft] K3: pseudo KRX3 "free" via LP-Pan+Power SDR
>
>I think what Eric is saying is that if you watch PowerSDR and listen to the
>K3 / KRX3, it will be a super combination. You will be able to see the
>passbands of both VFO A and VFO B frequencies and tune either one from the
>K3 or pan display, as long as the sub-receiver is tuned to within +/- 90kHz
>of the main receiver.
>
>There are some good reasons why listening to the K3 / KRX3 is desirable,
>especially for CW (and why the K3 blows the doors off the Flex Radios for
>CW). The main ones are the latency of the DSP processing in PowerSDR, and
>the serial interface of the K3. Under extreme contest situations, the added
>protection of the HAGC will be needed, and on the higher bands (10,6m), the
>K3 has more usable sensitivity because the transfer loss at the K3 IF output
>port adds to the NF of the panadapter. And the KRX3 allows cross band
>listening, more filter slots, etc.
>
>But many non-contesters will find that using the sub receiver in PowerSDR
>will be a viable option, especially in SSB. PowerSDR is no slouch when it
>comes to IMD and BDR, and has excellent DSP filtering. Up to about S9 + 65dB
>(K3 preamp off) the BDR is comparable to the K3 at spacings down to less
>than 1 kHz. Of course, in both cases transmitter IMD will be a bigger
>problem than BDR anyway.
>
>Either way, the operational flexibility of the panadapter in split mode is a
>killer feature. Being able to see holes in a pileup and click on them, or
>quickly jump to the frequency of the last guy who was answered will be
>invaluable. When full VFO B support is released in a couple weeks, I'll have
>some beta testers with KRX3s in hand, and I can get some comparative
>feedback.
>
>Larry N8LP
>
>
>
>Date: Wed, 30 Jul 2008 22:19:10 -0700
>From: Brett Howard <brett@livecomputers.com>
>Subject: RE: [Elecraft] K3: pseudo KRX3 "free" via LP-Pan+Power SDR
>To: n1al@cds1.net
>Cc: 'Elecraft Reflector' <elecraft@mailman.qth.net>, "'Eric Swartz -
>         WA6HHQ, Elecraft'" <eric@elecraft.com>
>Message-ID: <1217481550.8426.13.camel@lappy>
>Content-Type: text/plain
>
>The part that confuses me is the mention that "[PowerSDR] fully
>integrates with the KRX3's main and sub RX frequenciy on its panoramic
>display".
>
>Thats what it does now.  But in order for the KRX3 to actually be adding
>anything you'd have to be listening to its output with the full K3
>filter chain.  Cause you're not going to correct the dynamic range
>problems unless you're doing that.
>
>Then I don't see how it could allow you to be more than 192KHz/2 away
>from your main center freq as you'd have to have two sound cards and two
>IF outputs in order to pull that off.  I guess I don't really see a
>SubRX adding much to the PowerSDR setup unless you use one RX as a
>spotter and the other as simply a K3.  I think that 2 K3's would be a
>better setup for that.
>
>I see the subRX in the K3 as a way to make the K3 a better unit as a
>standalone unit.  Which I think is one thing that the K3 does really
>well especially since you can make RTTY/PSK contacts with just a K3
>sitting on your desk and nothing else.  You can also run it as a contest
>station for both CW and SSB (once the DVR is out).  I find it quite fun
>how much one can get done without the need to interface it to a
>computer.  Now don't get me wrong I'm a total computer guy and I find it
>even cooler that while it does all this stuff to not require you to have
>a computer it also makes is SOOO easy to interface to one when you
>decide you want to.
>
>So I guess all in all color me happy yet still confused as to the KRX3
>adding much to a powerSDR setup.
>
>_______________________________________________
>Elecraft mailing list
>Post to: Elecraft@mailman.qth.net
>You must be a subscriber to post to the list.
>Subscriber Info (Addr. Change, sub, unsub etc.):
>  http://mailman.qth.net/mailman/listinfo/elecraft
>
>Help: http://mailman.qth.net/subscribers.htm
>Elecraft web page: http://www.elecraft.com
>
>_______________________________________________
>Elecraft mailing list
>Post to: Elecraft@mailman.qth.net
>You must be a subscriber to post to the list.
>Subscriber Info (Addr. Change, sub, unsub etc.):
>  http://mailman.qth.net/mailman/listinfo/elecraft
>
>Help: http://mailman.qth.net/subscribers.htm
>Elecraft web page: http://www.elecraft.com

_______________________________________________
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft    

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com
[prev in list] [next in list] [prev in thread] [next in thread]