Kraken Discovery Feed + 1m WiFi Dish & HL3D Software = Outstanding H_Line Radio Telescope

[Alex P]

Pair this low cost 

Near-Off-The-Shelf   Hardware

    with minimally complex 

 SDR#>IFavg>HL3D>Rinearn  Software 

     and you will have an

 Outstanding Galactic Hydrogen Line Amateur Radio Telescope System

     

Alex Pettit

https://github.com/AP-HLine-3D/HLine3D/blob/main/21cm_Step1b_KrakenDiscoveryFeed_Eval_05.pdf

[Dykes Cupstid]

Alex,

I already have the Discovery Dish (KrakenRF) Hydrogen Feed. It is paired with the 1.42 Ghz Nooelec Wifi dish. At the time I bought the feed, the Discovery Dish itself was not available. It will be available again on April 18.  It appears you have used both dish models. Do you think that the Discovery Dish will make any improvement to my current setup from an RFI noise perspective or otherwise?

---

From: 'Alex P' via Society of Amateur Radio Astronomers <sara...@googlegroups.com>
Sent: Monday, March 23, 2026 8:58 AM
To: Society of Amateur Radio Astronomers <sara...@googlegroups.com>
Subject: [SARA] Kraken Discovery Feed + 1m WiFi Dish & HL3D Software = Outstanding H_Line Radio Telescope

 

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[Robert Meade]

Go bigger and pair that feed with a 1.5m solar cooker.

--

[b alex pettit jr]

Hello Dykes,

I have not tested the Kraken Disco Feed with the 70cm Dish.   The Disco Dish will have a larger beam-width : no advantage.  

IF however, you line the WiFi dish with aluminum screening & extend the sides to create a deeper 1.2m ( f/D 0.27 ) dish It will have higher performance.

The 1m extensions reduce the  beam-width, extending the short dimension blocks ground noise pickup.

Its a bit of a project.

( this does use a $400 WD5AGO LNA )

I've not seen a  "1m" class RT perform equally well.

Alex

[b alex pettit jr]

Its more than dish dia. that determines performance.

The "Solar Cooker" weighs 33 lbs. What's its f/D ratio ?

Being able to install the dish on a small equatorial mount has significant advantages for positioning.

Please post some comparable plots w/ the 1.5m

Alex P

================================================================

On Monday, March 23, 2026 at 01:53:23 PM EDT, Robert Meade <rjm27t...@gmail.com> wrote:

Go bigger and pair that feed with a 1.5m solar cooker.

.

[Robert Meade]

Eventually I may add some plots like that. My 5 degree elevation steps sky survey is almost done, but I'm also moving soon so no more yard. The smaller beamwidth is nice compared to DD (10 vs 20 deg full HPBW) . The f/D is about 0.4 IIRC, but the DD feed dipole board with subreflector has to be placed closer than the true focal length to the dish to get best Tsys and Gain combination.

The 1.2m with ground EMI shield outside the 1m dish is fine and weights a lot less. It's also a lot less sensitive to wind loading. So I'm not knocking it, but there is a trade to be made. (One that is better with more data) 

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[Robert Meade]

What RA coord(s) corresponds to those? You're drifting in DEC not RA for your scan? Is that using the EQ mount to hold RA maybe and you had it tilt in DEC? 

Also, What's your integration time so I can try my best to make some apples to apples charts? I still have to process a bunch of IQ data from my sigmf format to get spectra over the survey but this gives me flexibility in that regard. 

On Mon, Mar 23, 2026, 18:01 'b alex pettit jr' via Society of Amateur Radio Astronomers <sara...@googlegroups.com> wrote:

These spectra are in 1.25 degree Dec drift increments

How does this compare with your 1.5m Dish ?

On Monday, March 23, 2026 at 04:33:57 PM EDT, Robert Meade <rjm27t...@gmail.com> wrote:

Eventually I may add some plots like that. My 5 degree elevation steps sky survey is almost done, but I'm also moving soon so no more yard. The smaller beamwidth is nice compared to DD (10 vs 20 deg full HPBW) . The f/D is about 0.4 IIRC, but the DD feed dipole board with subreflector has to be placed closer than the true focal length to the dish to get best Tsys and Gain combination.

The 1.2m with ground EMI shield outside the 1m dish is fine and weights a lot less. It's also a lot less sensitive to wind loading. So I'm not knocking it, but 

there is a trade to be made. (One that is better with more data) 

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[Robert Meade]

If you meant 1.25 deg in RA I'll assume 5 min integration time, but I still would like to know which RA/DEC coord spans those traces pair with

[b alex pettit jr]

I deleted that post as it was from the modified 1m WiFi making a 1.2m f/D 0.27 ( not the Disco system )

Dec + 40 Deg  circa the bright region ~ RA 20:30 Hrs

Integration time 5 minutes = 1.25 degrees of RA drift per spectra.

Sorry, I misstated that yes drift in RA at a fixed Dec

Alex

[Robert Meade]

I have that to fish for in my zenith ish drift scan from January. I can get back to you this weekend with similar plots. Do you have plots like you showed above but for the 1m without the shield and using the disco feed? 

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[b alex pettit jr]

Yes .. I'll replot this in a similar format tomorrow

~ RA16-02 Hrs

[b alex pettit jr]

Data from the Kraken H1 Discovery Feed & nooelec 1m WiFi Dish ( stock )

Declination + 40 Deg   Drift Scan RA 20 - 22 Hrs

Alex Pettit

[Dykes Cupstid]

Alex,

I recently completed a drift scan at Dec +40. Can you explain how to interpret this particular plot of the Drift Error file generated by JA_IFAve2csv along with how the data is used. I looked at your presentation in Project HLine but without hearing the discussion can't completely get it. 

Dykes

---

From: 'b alex pettit jr' via Society of Amateur Radio Astronomers <sara...@googlegroups.com>
Sent: Tuesday, March 24, 2026 7:26 AM
To: sara...@googlegroups.com <sara...@googlegroups.com>
Subject: Re: [SARA] Kraken Discovery Feed + 1m WiFi Dish & HL3D Software = Outstanding H_Line Radio Telescope

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[b alex pettit jr]

Hi Dykes,

That is the frame to frame shift referenced to the lowest value at the CSN_Low channel and scaled in dB.

4 dB is a fairly large number .. and may be the result of any/several of these .

Potential Small Radio Telescope Background Drift/Shift Sources
Ground Noise Spillover
Outside Temperature Variation
Sky Transparency Changes
Sun Blackbody Radiation in Antenna Beam Pattern
Sun reflection off roofs / buildings / trees
Radio Frequency Interference ( LAN Blocking )
RF Connection Thermal Expansion Ohmic Changes
Thermal SDR Filter Shape Changes
Sunlight Refraction off Clouds

Thermal LNA Gain Changes  ( typically a Very Small error )

The Java code was originally written in Matlab 

                    Here is a Video 

Matlab Processing   Astronomy Art @ 1:22 - 1:42 Hrs

RTOP Oct 2023: Masers, Interferometry and Hydrogen Observation Art

RTOP Oct 2023: Masers, Interferometry and Hydrogen Observation Art

Does this Help ?

Alex

================================

[b alex pettit jr]

This was an unintentional verification of the  cold sky background drift normalization process :

The Sun passed through a side lobe during the drift scan & nicely corrected .

Alex

================================

On Tuesday, March 24, 2026 at 01:43:40 PM EDT, 'Dykes Cupstid' via Society of Amateur Radio Astronomers <sara...@googlegroups.com> wrote:

Alex,

I recently completed a drift scan at Dec +40. Can you explain how to interpret this particular plot of the Drift Error file generated by JA_IFAve2csv along with how the data is used.

 I looked at your presentation in Project HLine but without hearing the discussion can't completely get it. 

Dykes

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[Dykes Cupstid]

Thanks for the link to the Oct 2023 RTOP. Your presentation during the RTOP helped quite a bit.

I notice on the drift error plot I posted earlier that the drift error plot corresponds very closely to the 1^st peak then reduction and then 2^nd peak in my final Rinearn plot. In other words my error is highest when my Z amplitude is highest and my drift error is lowest when my Z amplitude is lowest. In fact I notice the same thing in the plots you just posted. All I can figure is the baseline is rising and falling right along with measured hydrogen signal amplitude, which, in my mind, doesn't correlate to any external factor. 

My assumption is that the JA_IFAve2csv software is accounting for the drift error in the final CSN_mxb_dBScaled file I am using as the file input to Rinearn. Is that correct?

In the RTOP presentation you are using a software called Matlab which I am unfamiliar with. Is IF_Ave2csv based on Matlab?

Dykes

---

From: 'b alex pettit jr' via Society of Amateur Radio Astronomers <sara...@googlegroups.com>
Sent: Tuesday, March 24, 2026 11:44 AM
To: 'b alex pettit jr' via Society of Amateur Radio Astronomers <sara...@googlegroups.com>

Subject: Re: [SARA] Kraken Discovery Feed + 1m WiFi Dish & HL3D Software = Outstanding H_Line Radio Telescope

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[b alex pettit jr]

Hi Dykes,

I think the correlation is more related to the time of the day ( position of the Sun / Outdoor Temp ) than any data.

The baseline should not be related to the signal level.

The CSN Low value is used for the overall level shift correction, CSN High is used to calculate a slope ( mX + b ) correction between Low & High

( That has more to do with small amplifier filter band changes vs temp )

The Java code implements the same ( and now extended ) functions I wrote initially in Matlab.

As for your question " What do you do with the plot ? "   Not much. It might be an interesting study to better quantify the source of the shifts,

Other than that, it's just a plot showing What the Software is doing ..

Mathworks Matlab is a phenomenal set of software. I used it for aerospace structural analysis for ~ 20 years.

They have dedicated "Toolboxes" which support a Wide variety of  applications.  It is extremely efficient for mathematical processing

Here's a List

https://www.mathworks.com/solutions.html#applications

Since Matlab does not support creating stand alone executable code ( without a $10K license ) it was painfully ( with assistance ) rewritten in Java.

( they now offer home licenses for $150 which is well worth the cost )

Alex

=================================================

[Dykes Cupstid]

Thanks Alex. I've got a better handle on what's going on under the hood now. Converting all that code to Java must have required a lot of patience and determination. I found a 2 hour introductory course to Mathworks Matlab on the link to Mathworks you provided. I am going to take the course and see where that leads.

By the way, I sure would like to get the color and contrast you achieve in your Rinearn plots!

Also, is there any possibility that IF_Ave2csv will be corrected to reset RA to 0 at RA 24hrs?

Thanks again

Dykes

---

From: 'b alex pettit jr' via Society of Amateur Radio Astronomers <sara...@googlegroups.com>

Sent: Tuesday, March 24, 2026 3:00 PM
To: 'Dykes Cupstid' via Society of Amateur Radio Astronomers <sara...@googlegroups.com>

Subject: Re: [SARA] Kraken Discovery Feed + 1m WiFi Dish & HL3D Software = Outstanding H_Line Radio Telescope

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[b alex pettit jr]

Color :

1) install the modified color chart

2) disable Z AutoRange & carefully tweak the range parameters ( especially Z-min )

24-00 Hr Rollover

That needs to be done in Rinearn. I can rollover the hour scale written to the * csv file, but without Rinearn changed,

 that will just ( improperly ) shift the data on the plot , but not continue the plot and enable the actual time rollover. 

IF this software becomes more actively used, I might be able to convince the author to include that option.

Matlab : Yes it's  good  'corporate' level software with which to become familiar.

During my career, software which was well documented, version controlled, and validated was required. Matlab met that criteria.

Regards,

Alex

=================================

[Dykes Cupstid]

Where is the modified color chart?

---

From: 'b alex pettit jr' via Society of Amateur Radio Astronomers <sara...@googlegroups.com>

Sent: Tuesday, March 24, 2026 4:03 PM

To: 'Dykes Cupstid' via Society of Amateur Radio Astronomers <sara...@googlegroups.com>
Subject: Re: [SARA] Kraken Discovery Feed + 1m WiFi Dish & HL3D Software = Outstanding H_Line Radio Telescope

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[b alex pettit jr]

Here :

Here is the *.ini ascii file 

( I thought I had uploaded it but have not done so )

====================================================

########################################
#
# RINEARN Graph 3D SETTING FILE
#
# - Copyright Free (CC0)
#
########################################

VERSION=5.6
LANGUAGE=ENGLISH

####################
# ASPECT RATIO
####################

RATIO_X=1.15
RATIO_Y=1.388
RATIO_Z=1.478

# The priority of above parameters is higher than the priority of "X(or Y,Z)_LENGTH".
# If you want to plot graphs of the same size as Ver.5.5.40 and earlier versions, please use the following parameters.
#
# X_LENGTH=0.6749999999999999
# Y_LENGTH=0.7939999999999999
# Z_LENGTH=0.839

####################
# COLOR SETTINGS
####################

COLOR_SERIES_0=RED
COLOR_SERIES_1=BLUE
COLOR_SERIES_2=GREEN
COLOR_SERIES_3=MAGENTA
COLOR_SERIES_4=YELLOW
COLOR_SERIES_5=CYAN
COLOR_SERIES_6=PINK
COLOR_SERIES_7=ORANGE

####################
# RANGE SETTINGS
####################

RANGE_AUTO_X=ON
RANGE_AUTO_Y=ON
RANGE_AUTO_Z=ON

####################
# LABEL SETTINGS
####################

LABEL_X=X
LABEL_Y=Y
LABEL_Z=Z

####################
# CAMERA SETTINGS
####################

CAMERA_HORIZONTAL_ANGLE=1.571
CAMERA_VERTICAL_ANGLE=0.0
CAMERA_ZENITH_AXIS=Z
CAMERA_DISTANCE=45.800000000000004
CAMERA_MAGNIFICATION=9990.0
CAMERA_PERSPECTIVE=ON
CAMERA_SCREEN_WIDTH=847
CAMERA_SCREEN_HEIGHT=694
CAMERA_SCREEN_CENTER_OFFSET_X=-9
CAMERA_SCREEN_CENTER_OFFSET_Y=0
CAMERA_HIGH_QUALITY=true


####################
# LIGHT SETTINGS
####################

LIGHT_AMBIENT=0.0
LIGHT_DIRECTIONAL=0.6
LIGHT_DIFFRACTIONAL=0.4980392156862745
LIGHT_SHININESS=0.4980392156862745
LIGHT_SHINY_ANGLE=1.2990980392156863
LIGHT_HORIZONTAL_ANGLE=0.71
LIGHT_VERTICAL_ANGLE=-7.963267948964958E-4

####################
# FONT SETTINGS
####################

FONT_NAME_SCALE=Dialog
FONT_NAME_LABEL=Dialog
FONT_NAME_COMMENT=Dialog
FONT_NAME_MARKER=Monospaced
FONT_SIZE_SCALE=12
FONT_SIZE_LABEL=18
FONT_SIZE_COMMENT=12
FONT_TYPE_SCALE=BOLD
FONT_TYPE_LABEL=BOLD
FONT_TYPE_COMMENT=BOLD

####################
# SCALE SETTINGS
####################

SCALE_FRAME_TYPE=BOX
SCALE_N_X=4
SCALE_N_Y=4
SCALE_N_Z=4
SCALE_N_COLOR_BAR=1
SCALE_TICK_LENGTH=0.05
SCALE_TICK_INNER=OFF
SCALE_TICK_INNER_BACKWALL=OFF
SCALE_NUMBER_MARGIN=0.05
SCALE_FORMAT_AUTO_X=OFF
SCALE_FORMAT_AUTO_Y=OFF
SCALE_FORMAT_AUTO_Z=OFF
SCALE_FORMAT_WIDERANGE_X=0.000
SCALE_FORMAT_WIDERANGE_Y=0.000
SCALE_FORMAT_WIDERANGE_Z=0.000
SCALE_FORMAT_SHORTRANGE_X=0.00
SCALE_FORMAT_SHORTRANGE_Y=0.00
SCALE_FORMAT_SHORTRANGE_Z=0.00
SCALE_VISIBLE_AUTO_X=OFF
SCALE_VISIBLE_AUTO_Y=OFF
SCALE_VISIBLE_AUTO_Z=OFF
SCALE_VISIBLE_X_0=OFF
SCALE_VISIBLE_X_1=OFF
SCALE_VISIBLE_X_2=ON
SCALE_VISIBLE_X_3=ON
SCALE_VISIBLE_Y_0=OFF
SCALE_VISIBLE_Y_1=OFF
SCALE_VISIBLE_Y_2=ON
SCALE_VISIBLE_Y_3=ON
SCALE_VISIBLE_Z_0=OFF
SCALE_VISIBLE_Z_1=OFF
SCALE_VISIBLE_Z_2=OFF
SCALE_VISIBLE_Z_3=OFF
SCALE_LINE_WIDTH=1.0

####################
# PLOT OPTIONS
####################

SCALE=ON
LABEL=ON
FRAME=ON
FLAT=OFF
LINE=OFF
LINE_WIDTH=1.0
POINT=OFF
POINT_RADIUS=2.0
MARKER=OFF
MARKER_CHAR= œ, ¡, £, ¥, Z, , ¢, ¤, ž, ~
MARKER_BOLD=OFF
MARKER_SIZE=10.0
MARKER_OFFSET_RATIO_Y=0.2
DOT=OFF
BALL=OFF
MESH=OFF
MEMBRANE=ON
CONTOUR=ON
CONTOUR_SECTION_N=10
CONTOUR_LINE_WIDTH=1.0
COMMENT=ON
BLACK_SCREEN=ON
GRADATION=ON
GRADATION_AXIS=Z
GRADATION_COLOR_LIST=1.0,0.0,0.0,1.0;1.0,1.0,0.0,1.0;0.0,1.0,0.0,1.0;0.0,1.0,1.0,1.0;0.5,0.0,0.5,0.7;
GRADATION_RANGE_AUTO=ON
GRADATION_COLOR_MAP=ON
GRADATION_FADE_IN=OFF
GRADATION_FADE_OUT=OFF
GRADATION_INTERPOLATION=ON
ALPHA_COLOR=OFF
GRID_LINE=ON
TESSELLATION=OFF
LOG_X=OFF
LOG_Y=OFF
LOG_Z=OFF
REVERSE_X=OFF
REVERSE_Y=OFF
REVERSE_Z=OFF
CUSTOM_OPTION=OFF

=====================================================

Save to the RinearnGraph3DQuickSetting folder

[b alex pettit jr]

save that text file  as Standard_Z_View.ini  or something 

[Dykes Cupstid]

Got it installed. Working very well!

---

From: 'b alex pettit jr' via Society of Amateur Radio Astronomers <sara...@googlegroups.com>

Sent: Tuesday, March 24, 2026 4:52 PM
To: 'b alex pettit jr' via Society of Amateur Radio Astronomers <sara...@googlegroups.com>

Subject: Re: [SARA] Kraken Discovery Feed + 1m WiFi Dish & HL3D Software = Outstanding H_Line Radio Telescope

save that text file  as Standard_Z_View.ini  or something 

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