[hpsdr] hpsdr Digest, Vol 16, Issue 4
Wilhelm Hartinger
oe6ag at aon.at
Tue Jun 5 11:26:59 PDT 2007
----- Original Message -----
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To: <hpsdr at hpsdr.org>
Sent: Tuesday, June 05, 2007 7:25 PM
Subject: hpsdr Digest, Vol 16, Issue 4
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> Today's Topics:
>
> 1. Re: Janus frequency response ? (Ahti Aintila)
> 2. Re: PowerSDR additional panel info? (Kevin M0KHZ)
> 3. Re: OXDR HPSDR/SDR1000 In A Box (Philip Covington)
> 4. HPSDR = High Power Software Defined Radio? (Phil Harman)
> 5. Re: Janus frequency response ? (David Woodhead)
> 6. Re: HPSDR = High Power Software Defined Radio? (Kevin M0KHZ)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 5 Jun 2007 08:25:32 +0300
> From: "Ahti Aintila" <oh2rz.sdr at gmail.com>
> Subject: Re: [hpsdr] Janus frequency response ?
> To: "David Woodhead" <dwoodhead at bms-inc.com>
> Cc: hpsdr at hpsdr.org
> Message-ID:
> <d20013450706042225r29174cdcl741db791bc84218e at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> David,
>
> In my case with Janus at 96 kHz I get about 4 dB signal (and noise
> floor) drop at the display edges and about 10 dB with 192 kHz
> sampling. I did not do the test with 48 kHz sampling because the
> signal drooping was so small.
> However, in these tests we have to remember that the QSD output
> frequency response is not flat. It has the bandwidth given by the
> formula Eq 8 ( in Gerald's article QEX Jul/Aug 2002, page 20)
> BWdet = 1/(pi*n*R*Cs)
>
> I checked the input signal to Janus and did not find any significant
> difference between the input signal and display frequency response.
>
> I don't understand why do you get so much different readings between
> Janus and D44. Unfortunately, I don't have the Delta 44 to compare
> with.
>
> 73, Ahti OH2RZ
>
> On 04/06/07, David Woodhead <dwoodhead at bms-inc.com> wrote:
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> I have my Janus/Ozy working with a homebrew SDR1000 clone and noted the
>> following in comparing with a Delta 44.
>>
>> With the panoramic display on maximum span and sweeping a signal
>> generator across this span I see the signal drop about 10dB on the
>> display edges with Janus but only drops 2 or 3 dB with a Delta44. Both
>> tests with 48K sampling. I also see this in the noise floor which slopes
>> to about -10dB at the panoramic display edges vs. DC zero (noiuse floor
>> is much flatter with Delta 44). This suggests to me that my Janus board
>> has a frequency response problem and I wonder if others are seeing the
>> same thing?
>>
>> I also see a 2nd harmonic component in the panoramic display that is
>> about 10dB worse with Janus than my Delta 44. This is with a signal
>> input about 10dB below saturation (this is twice the input frequency on
>> IQ inputs to Janus). I have not checked to see if this is worse in I or
>> Q inputs yet.
>>
>> I'd be interested in others observations?
>>
>> Thanks!
>>
>> David
>>
>> KM5TZ
>> _______________________________________________
>> HPSDR Discussion List
>> To post msg: hpsdr at hpsdr.org
>> Subscription help: http://lists.hpsdr.org/listinfo.cgi/hpsdr-hpsdr.org
>> HPSDR web page: http://hpsdr.org
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>>
>
>
> ------------------------------
>
> Message: 2
> Date: Tue, 5 Jun 2007 06:52:30 +0100 (GMT Daylight Time)
> From: "Kevin M0KHZ" <m0khz at tiscali.co.uk>
> Subject: Re: [hpsdr] PowerSDR additional panel info?
> To: <hpsdr at hpsdr.org>, "Bill Tracey" <bill at ewjt.com>
> Message-ID: <4664FA1E.000001.02784 at M0KHZ01>
> Content-Type: text/plain; charset="us-ascii"
>
> Thanks Bill
> It's beginning to make sense!
> 73's
> Kevin
>
>
> -------Original Message-------
>
> From: Bill Tracey
> Date: 05/06/2007 04:25:56
> To: Kevin M0KHZ; hpsdr at hpsdr.org
> Subject: Re: [hpsdr] PowerSDR additional panel info?
>
> The additional controls/display on the bottom are:
>
> DDS Lock allows you to lock the DDS at it current point, essentially
> making your SDR 1000 pretend it is a SoftRock. DDS shows what the
> DDS is set to and DttSP Osc shows what the SW oscillator in DttSP is set
> to.
>
>
> The remaining fields were used to debug the Ozy/Janus - PowerSDR
> code. The fields are:
>
> C0-4 out and in show the outbound and inbound Control bytes -- there
> are 5 control bytes in each frame, this shows them (on a sampled basis)
> C0 is just a binary decode of the 0th control byte
> SL, SG, and NOKS are counters for SyncLost, SyncGained, and
> NotOKtoSend conditions.
>
> The Sync field shows whether or not PowerSDR is currently
> maintaining sync with Ozy/Janus.
>
> Regards,
>
> Bill (kd5tfd)
>
>
> At 08:16 AM 6/4/2007, Kevin M0KHZ wrote:
>>***** High Performance Software Defined Radio Discussion List *****
>>
>><...snip...>
>>Running modified PowerSDR V1.6.3 and am wondering what the additional info
> is
>>
>>On the bottom of the main panel?
>>
>>
>>
>>DDS Lock / DDS: /DttSPOsc I understand but what about the rest of the
>>data?
>>
>>
>>
>>Just curious!
>>
>>
>>
>>Kevin
>
>
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> ------------------------------
>
> Message: 3
> Date: Tue, 5 Jun 2007 09:17:29 -0400
> From: "Philip Covington" <p.covington at gmail.com>
> Subject: Re: [hpsdr] OXDR HPSDR/SDR1000 In A Box
> To: "john_eckert at agilent.com" <john_eckert at agilent.com>
> Cc: hpsdr at hpsdr.org
> Message-ID:
> <32aa05ee0706050617t2c409a9ex9b61d13d5c548597 at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> On 6/4/07, john_eckert at agilent.com <john_eckert at agilent.com> wrote:
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> Hi All,
>>
>> After spending four days on my four hour project, it's done.
>>
>> Take a look: exothink.com/OXDR
>>
>> http://www.exothink.com/OXDR/
>>
>>
>> Now I can put a couple hours into integrating Bill's code
>> into v1.9.0 :).
>>
>> 73,
>> John
>
> Very nice work!
>
> 73 Phil N8VB
>
>
> ------------------------------
>
> Message: 4
> Date: Tue, 5 Jun 2007 21:17:38 +0800
> From: "Phil Harman" <pvharman at arach.net.au>
> Subject: [hpsdr] HPSDR = High Power Software Defined Radio?
> To: "HPSDR" <hpsdr at hpsdr.org>
> Message-ID: <004801c7a773$e39d1a30$0201a8c0 at phil>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> Whilst at Dayton I had the pleasure of meeting Mike Dishop of Dishtronix.
> Mike was exhibiting a state-of-the-art solid state QRO linear amplifier (
> http://www.dishtronix.com ). His design has a number of unique features,
> a
> number of which are patent pending.
>
> Mike's amplifier consist of a number of 600w modules that are combined
> together to provide 2.4 kW of output.
>
> I suggested to Mike that he may like to offer the 600W module as a stand
> alone amplifier assembly, including SMPS PSU, Low pass filters, T/R
> switching, etc for use with Penelope as a high power linear amplifier.
> Mike's can provide a module that only requires 1W of drive and since we
> can
> provide all the
> control signals he needs from Penelope and Ozy it is well matched to our
> needs.
>
> The 600W module has the following specification:
>
> - Completely self contained with integral low noise Switch Mode PSU,
> 110 -
> 240v ac input
> - Integrates with Penelope and Ozy for all command and control signals
> - Frequency coverage 160m-6m.
> - Output power 600W PEP
> - Third Order Intermod at 600W -36dB below PEP
> - Drive power 1W PEP nominal
> - Harmonic output at 600w > 46 dB down
> - Tx/Rx time (using antenna relay) 10-20mS, (8mS with vacuum relay
> option) , (3mS with PIN diode option)
> - Integrated SWR sensor, T/R system (SO239 for antenna, BNC for receiver),
> High capacity cooling fan.
> - Size 10 x 12 x 12 (HWD), estimated..
> - Availability - approximately 3 months from order
> - Price - $1,500 - $2,000 depending on total number ordered, final
> specification features, etc.
>
> Mike will answer any questions relating to the module on this reflector.
> We will shortly be adding a facility to www.hamsdr.com to enable you to
> express interest in purchasing one of Mike's amplifiers.
>
> I have no connection with Dishtronix - I'd just like one of his modules!
>
> 73's Phil...VK6APH
>
>
>
> ------------------------------
>
> Message: 5
> Date: Tue, 5 Jun 2007 09:10:31 -0700
> From: "David Woodhead" <dwoodhead at bms-inc.com>
> Subject: Re: [hpsdr] Janus frequency response ?
> To: "Ahti Aintila" <oh2rz.sdr at gmail.com>
> Cc: hpsdr at hpsdr.org
> Message-ID:
> <BEFF30BFC93A214FB7F13D987F13444B0D1B93 at DELTAMC.deltad.com>
> Content-Type: text/plain; charset="us-ascii"
>
> Ahti,
>
> I figured out the problem. The Janus board input has series resistors
> (39K) to lower the signal level from the SDR1000. These are followed by
> emi filters which = 1000pF to ground. The combination is a nice LPF!
> Shorting the series resistors fixed the problem and resulted in a nice
> flat noise spectrum with just a few dB roll off on the edges (same as
> Delta 44). Ofcourse the gain is too high now so I must come up with a
> better solution. I plan to drive the A/D with a differential signal
> (presently I'm only driving it on one side) which should improve the
> dynamic range a little. I'm not sure this is new information - I just
> didn't pay attention to it first time around.
>
> I wonder if anybody has experimented with different LPF values on the
> QSD for 192KHz sampling?
>
> 73's
>
> David.
> KM5TZ
>
> -----Original Message-----
> From: Ahti Aintila [mailto:oh2rz.sdr at gmail.com]
> Sent: Monday, June 04, 2007 10:26 PM
> To: David Woodhead
> Cc: hpsdr at hpsdr.org
> Subject: Re: [hpsdr] Janus frequency response ?
>
> David,
>
> In my case with Janus at 96 kHz I get about 4 dB signal (and noise
> floor) drop at the display edges and about 10 dB with 192 kHz sampling.
> I did not do the test with 48 kHz sampling because the signal drooping
> was so small.
> However, in these tests we have to remember that the QSD output
> frequency response is not flat. It has the bandwidth given by the
> formula Eq 8 ( in Gerald's article QEX Jul/Aug 2002, page 20) BWdet =
> 1/(pi*n*R*Cs)
>
> I checked the input signal to Janus and did not find any significant
> difference between the input signal and display frequency response.
>
> I don't understand why do you get so much different readings between
> Janus and D44. Unfortunately, I don't have the Delta 44 to compare with.
>
> 73, Ahti OH2RZ
>
> On 04/06/07, David Woodhead <dwoodhead at bms-inc.com> wrote:
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> I have my Janus/Ozy working with a homebrew SDR1000 clone and noted
>> the following in comparing with a Delta 44.
>>
>> With the panoramic display on maximum span and sweeping a signal
>> generator across this span I see the signal drop about 10dB on the
>> display edges with Janus but only drops 2 or 3 dB with a Delta44. Both
>
>> tests with 48K sampling. I also see this in the noise floor which
>> slopes to about -10dB at the panoramic display edges vs. DC zero
>> (noiuse floor is much flatter with Delta 44). This suggests to me that
>
>> my Janus board has a frequency response problem and I wonder if others
>
>> are seeing the same thing?
>>
>> I also see a 2nd harmonic component in the panoramic display that is
>> about 10dB worse with Janus than my Delta 44. This is with a signal
>> input about 10dB below saturation (this is twice the input frequency
>> on IQ inputs to Janus). I have not checked to see if this is worse in
>> I or Q inputs yet.
>>
>> I'd be interested in others observations?
>>
>> Thanks!
>>
>> David
>>
>> KM5TZ
>> _______________________________________________
>> HPSDR Discussion List
>> To post msg: hpsdr at hpsdr.org
>> Subscription help: http://lists.hpsdr.org/listinfo.cgi/hpsdr-hpsdr.org
>> HPSDR web page: http://hpsdr.org
>> Archives: http://lists.hpsdr.org/pipermail/hpsdr-hpsdr.org/
>>
>
>
> ------------------------------
>
> Message: 6
> Date: Tue, 5 Jun 2007 18:25:47 +0100 (GMT Daylight Time)
> From: "Kevin M0KHZ" <m0khz at tiscali.co.uk>
> Subject: Re: [hpsdr] HPSDR = High Power Software Defined Radio?
> To: <hpsdr at hpsdr.org>, "Phil Harman" <pvharman at arach.net.au>
> Message-ID: <46659C9B.000001.02672 at M0KHZ01>
> Content-Type: text/plain; charset="us-ascii"
>
> All I can see on first impressions is wow!
> Unfortunately I think this is going to be out of my price range, I'm not
> saying it's not worth the expense, just beyond my pocket.
>
> How does this spec line up with Thor? And are there any tentative price
> guestimates for comparison?
>
> Once again just curious!
>
> For anyone considering another solution, check Steve Drury's G6ALU, site.
> I
> ve built 2 of his 20 FET PA, very stable and cheap. The 150W version is
> next
> on my list of things to do! - also very cheap - which suits my pocket just
> fine :)
>
> Here is Steve link:
>
> http://www.radio-kits.co.uk/
>
> Kevin
>
>
> -------Original Message-------
>
> From: Phil Harman
> Date: 05/06/2007 14:18:15
> To: HPSDR
> Subject: [hpsdr] HPSDR = High Power Software Defined Radio?
>
> ***** High Performance Software Defined Radio Discussion List *****
>
> Whilst at Dayton I had the pleasure of meeting Mike Dishop of Dishtronix.
> Mike was exhibiting a state-of-the-art solid state QRO linear amplifier (
> http://www.dishtronix.com ). His design has a number of unique features,
> a
> number of which are patent pending.
>
> Mike's amplifier consist of a number of 600w modules that are combined
> together to provide 2.4 kW of output.
>
> I suggested to Mike that he may like to offer the 600W module as a stand
> alone amplifier assembly, including SMPS PSU, Low pass filters, T/R
> switching, etc for use with Penelope as a high power linear amplifier.
> Mike's can provide a module that only requires 1W of drive and since we
> can
> provide all the
> control signals he needs from Penelope and Ozy it is well matched to our
> needs.
>
> The 600W module has the following specification:
>
> - Completely self contained with integral low noise Switch Mode PSU,
> 110 -
> 240v ac input
> - Integrates with Penelope and Ozy for all command and control signals
> - Frequency coverage 160m-6m.
> - Output power 600W PEP
> - Third Order Intermod at 600W -36dB below PEP
> - Drive power 1W PEP nominal
> - Harmonic output at 600w > 46 dB down
> - Tx/Rx time (using antenna relay) 10-20mS, (8mS with vacuum relay
> option) , (3mS with PIN diode option)
> - Integrated SWR sensor, T/R system (SO239 for antenna, BNC for receiver),
> High capacity cooling fan.
> - Size 10 x 12 x 12 (HWD), estimated..
> - Availability - approximately 3 months from order
> - Price - $1,500 - $2,000 depending on total number ordered, final
> specification features, etc.
>
> Mike will answer any questions relating to the module on this reflector.
> We will shortly be adding a facility to www.hamsdr.com to enable you to
> express interest in purchasing one of Mike's amplifiers.
>
> I have no connection with Dishtronix - I'd just like one of his modules!
>
> 73's Phil...VK6APH
>
> _______________________________________________
> HPSDR Discussion List
> To post msg: hpsdr at hpsdr.org
> Subscription help: http://lists.hpsdr.org/listinfo.cgi/hpsdr-hpsdr.org
> HPSDR web page: http://hpsdr.org
> Archives: http://lists.hpsdr.org/pipermail/hpsdr-hpsdr.org/
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> ------------------------------
>
> _______________________________________________
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> To post msg: hpsdr at hpsdr.org
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>
> End of hpsdr Digest, Vol 16, Issue 4
> ************************************
>
>
>
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