SM5LE homepage

SM5LE links :  http://web.telia.com/~u14901546/home_page_no_3.htm  and  http://web.comhem.se/sm5le

My E - mail address :     

Page updated 25 okt 2009

SM5LE is EME QRT.

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SM5LE "picture findings" , SM5LE and the moon.

Picture 1 : note the short TX-coax cable 1.5m  7/8"  +  4m Ecoflex 15.

Picture 2 : note the "ballast weight" a blue plastic bag from the Swedish spirit company "Systembolaget", filled with 12 kg sand.

Picture 4 : note the apple tree ; "EME trimmed" branches :-)

 

Photo by Ann-Mari SM5LE´s  xyl .     November. 2008
 

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Many happy radio-amateurs here :

http://sm0fob.blogspot.com

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SM5LE moonvoice (at LX1DB) coverted to stereo afterwards.

" lima echo ... sugar mike five lima echo ... cq eme "

http://web.comhem.se/sm5le/sm5le_eme_voice.mp3

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whoops, this can happen when doing 1296 MHz EME with 2.2m dish.

Transmitting  "T" and have a "U" back from the moon ! J

http://web.comhem.se/sm5le/sending_T_rxing_U.mp3

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3_echo_samples_400W.mp3

The TX tone is 800 Hz and echo 550 and 375 Hz (just adjusting the pitch with RIT).

The echos is very VISIBLE !

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For sale :

Hybrid Coupler (3dB 90 º),  Anaren XC1400P-03S 

        25 kronor /st

Anaren XC1400P-03S data you find here :   http://anaren.com/products/index.cfm?c=12

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15th Italian EME Contest CW / SSB 2008

Band: 1296 MHz

Place

 Call

 Qso 

 It.stn.

 Point

Antenna

1

ON7UN 

15

3

213

6.1mt. Dish .

2

SP6JLW

14

3

203

6.5mt. Dish .

3

SV3AAF

12

3

183

3.9mt. Dish.

4

VA7MM

9

3

153

3mt. Dish .

4

ON4BCB

9

3

153

4.9mt. Dish .

6

SM5LE

9

2

132

2.2mt. mesh Dish.

    ------------------------------------------------------------------------------------------------------------------------------

 

 

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For sale :

Hybrid Coupler (3dB 90 º),  Anaren XC1400P-03S 

        25 kronor /st

Anaren XC1400P-03S data you find here :   http://anaren.com/products/index.cfm?c=12

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Did work 8 CW QSO:n the 15th nov.

 

DL0SHF, RA3AQ, IW2FZR, G5CCH, K2DH, PI9CAM, OZ4MM.

 

Total 26 QSO in ARRL contest. One (1) more than last year :-)

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ARRL EME contest 2007 results here:

 

http://web.comhem.se/sm5le/2007%20ARRL%20EME,%20Scores.doc

 

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Worked on JT65c : PY2BS 2.7m dish and 50w @ feed !

From Sao Paulo city in Brazil to Stockholm/Haninge via moon ! #My station

 

http://web.comhem.se/sm5le/PY2BS_2.JPG    http://web.comhem.se/sm5le/PY2BS_3.JPG   

 

 

http://web.comhem.se/sm5le/PY2BS_1.JPG    http://web.comhem.se/sm5le/PY2BS_4.JPG

 

Fantastic !

 

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The Dwingeloo 25 meter Radio Telescope PI9CAM moon echos

http://web.comhem.se/sm5le/PI9CAM%20Vader%20Jacob%2023%20cm%20by%20PA3FXB.mp3

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Results from first leg in ARRL EME contest (18/19 Oct.)

 

Worked on CW , 19 QSO´s  (9 more than last year) :
 

OK1DFC , OK1CA , G3LTF , LA9NEA , HB9HAL , K1JT , SM4DHN ,
ES5PC , K1RQG ,
DL4MEA , OH2DG , DF3RU , ON4BCB , F2TU , HB9Q , VK3UM ,
SP6JLV , F5FEN (new#) , SD3F.
 

 

Comments from participants :

- I certainly noticed the extra ERP Sven, last night you were an excellent signal.

- I recognized that you were stronger with that new PA


 

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Improvements pays off. This is two echo tests (print screen) one from Dec. 2006 and one from Okt. 2008.

 

http://web.comhem.se/sm5le/Echo%20printscreen_2.JPG            http://web.comhem.se/sm5le/EKO_500_2.JPG

 

"a dB here and a dB there" makes ~10dB echo improvements.

The dec 2006 is without Septum ring and no insect mesh and no cavity LNA and app. 200W TX power

and 1.5 dB worse TX coax.

 

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The Kildal report (most of it advance theory)

"Maximization of a Paraboloidal Reflector Fed by a Dipole-Disk Antenna with Ring by Using the Multiple-Reflection"

http://web.comhem.se/sm5le/kildal1997.pdf

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Nine (#9) stations worked in Italian EME CW/SSB contest (20-21 Sept.)

 

 

[power / dish diameter]

 

SP6JLW [4xBLV958 / 6.5 m], IW2FZR [TH308 / 4 m], IK2MMB [TH327 / 3.6m],

ON7UN [2 kW / 6.1 m] , K5PJR [300 W / 5 m]

SV3AAF [1  kW / 3.6 m ], ON4BCB [350 W / 4.8 m], K5JL [1.5 kW / 8.5 m] and LA9NEA [250 W / 5.3 m].
 

Hrd : IK3COJ [300 W / 3.8 m] and UT5JCW [250 W / 3.7 m] and a station with "MM" in call. Probably VA7MM,
 

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Comments from some abt new PA :

 

- Wow, 3 dB helps a lot :-) Congrats on this big improvement!!
- Sven, I has received your signal very good yesterday.
- Hi Sven, congrats for the signal with the new PA.
- Bravos to SM5LE !
- Hello Sven, I experienced the difference comparing to the signal strength you had before the power increase, congrats!!

- Sven, A really nice increase in signal strength!

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Todays sigs : CQ from ON7UN   http://web.comhem.se/sm5le/CQ_ON7UN.mp3

 

Todays echo with 500 W :  http://web.comhem.se/sm5le/3_echo_samples_500W.mp3

 

New init on CW :  IK2MMB 3.6 m dish  and TH327 in PA

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New JT init : RW6AG , 3.7 m 70 W.

 

Comments from some abt new PA : Tnx QSO Sven, an impressive improvement!
Well, your extra 3 dB is also very audible … you had an arm chair copy signal.

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 500 W

The "in-phasing" two PA´s was a success. By "coarse cutting" coax and fine tuning by a slide

the max output power and minimum unbalance was achieved. The setup http://web.comhem.se/sm5le/phase_setup.JPG 

The cutting procedur :  http://web.comhem.se/sm5le/fine_tune_phase.JPG   http://web.comhem.se/sm5le/Cutting_phase.JPG   http://web.comhem.se/sm5le/Cutting_diagr.JPG   http://web.comhem.se/sm5le/pahes_scale.JPG  

 

 

 

The resulting unbalance is -27 dB at 500W. (only 1W is "burned" in the isolation port)

Very little (none) difference at the reduced power 150 W and max output was seen ,during phase tuning.

 

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Combining two PA (Power Amplifiers) with unknown phase.

The idea is to use the "Isolated" port in the "High-Power 3dB HYBRID RING COUPLER"  for monitoring power.

However MINIMUM power in this port, hopefully that will occur at the same time as maximum output power!

The minimum will be sharper than tune for max. output.

 http://web.comhem.se/sm5le/Combining_1.JPG

 Using low power and CW dots (50% duty cycle) to start with, and going up smoothly in power will do the trick , I hope  J.  

Follow the combining story here. The equipment is installed and main power connected ... T.B.C. (To Be Continued)

http://web.comhem.se/sm5le/PA2_ready.JPG       http://web.comhem.se/sm5le/Combining_3.JPG      http://web.comhem.se/sm5le/Combining_2.JPG     http://web.comhem.se/sm5le/Devider1.JPG 

 

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Measured to day the "High-Power 3dB HYBRID RING COUPLER"  from RF HAMDESIGN.

http://web.comhem.se/sm5le/RF_design_3dB.JPG

Insertion loss ( measured with NF-meter HP8970A [gain] ) ≤ 0.1 dB

Isolation 180° = 39dB  and   0° = 47dB ( measured with spectrum analyzer )

Reflection ≤ -30dB all ports ( measured with HP directional coupler 87300B )

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My ordinary PA is now cloned, if all goes well (phasing together etc) the result should be : 500W CW (400W JT) !

http://web.comhem.se/sm5le/cloned_PA.JPG     http://web.comhem.se/sm5le/klonat_PA.JPG  

   

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       My very first attempt to do Software Defined Radio (SDR).

 

A Softrock v 6.1 RX (at 28 MHz, the 1296 MHz  IF) and a external soundcard E-MU 0202 at 176.4 kHz sample rate and a Lap Top with Windows XP Service Pack 2 (important) are used.    http://web.comhem.se/sm5le/EMU_0202_Softrock.JPG    Software is Rocky 3.4 .

 

For experimenting purpose I did use an external oscillator for the Softrock RX,  

from a shortwave RX , SRT CR302A. (the local oscillator, 28.0MHz)   http://web.comhem.se/sm5le/external_osc_1.JPG    http://web.comhem.se/sm5le/external_osc_2.JPG

The X-tal inside Softrock was disconnected and replaced with a coax-cable for feeding the external oscillator.  http://web.comhem.se/sm5le/cable_1.JPG http://web.comhem.se/sm5le/cable_atandoff.JPG    http://web.comhem.se/sm5le/Softrock_external_osc_1_schematic.JPG  The SRT RX has an oven for the 5 MHz reference oscillator and very stable. Not really necessary for this application , only for experimenting ...  J

 

I can now easy see sigs from 1296.005 to 1296.090 MHz on my Lap Top.

The frequency scale is done the "SM5LE way" .http://web.comhem.se/sm5le/LapTop_1.JPG     

and a carrier on 1296.065 MHz.   http://web.comhem.se/sm5le/LapTop_2.JPG

 

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http://web.comhem.se/sm5le/ARRL_Contest_Award.JPG

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http://web.comhem.se/sm5le/W7UPF_QSL.JPG

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SV3AAF dish picture.  http://web.comhem.se/sm5le/SV3AAF_dish.JPG

The dish was f/d=0.35 at 3.05m diameter, now it is f/d=0.30 at 3.6m dia.   ...

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New JT65C init : UE6YYY       3.7 m 75 W @ feed.      Russian Hamfest in Maykop  loc. LN04

Print screen : http://web.comhem.se/sm5le/bara%20myror.JPG

Waterfall speed : http://web.comhem.se/sm5le/UE6YYY%20slow%20speed.JPG

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SM5LE did measure moon echoes during the partial solar eclipse 2008 Aug 01 :

http://web.comhem.se/sm5le/eclips%20and%20echos.JPG

The trend line shows maximum echo (min sun noise) for maximum eclipse. 

Is EME possible when total solar eclipse occur ... ?

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SM5LE  *EME*  SSB voice recording  !

(SM5LE recorded by PI9CAM)

http://web.comhem.se/sm5le/SM5LE_SSB.mp3

http://web.comhem.se/sm5le/SM5LE%20SSB%20voice.JPG

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New JT65C init : W7UPF 3m / 200 W   DM42

JT65c WAV-file here :   http://web.comhem.se/sm5le/W7UPF_JT65C.WAV  (use "save target"  ["spara som"] and open from inside WSJT)

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Uraguay QSL 

http://web.comhem.se/sm5le/DL1YKM_CX.JPG

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When looking for Hybrid Coupler (3dB 90 º) for TX , I realised that GPS band include 1296 MHz.

Can this little Anaren XC1400P-03S     handle 100W ?

Puff ... smoke   no L   !

 

But, YES !  With improved WirePac SWR and a cooling flange it is now delivery 100W .

 

The cooling flange is 1/4 l long so that "infinite" (upper) is transformed to zero (bottom) and

the Hybrid Coupler is grounded also to the air !    (  Is that true ... J ? )

 

Anaren XC1400P-03S data you find here :   http://anaren.com/products/index.cfm?c=12

 

Anaren_dB to  VSWR Conversion.pdf

 

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When using Wire Line or Wire Pac I always have used the calculator at http://www.filss.com/comp/hybrids_couplers.shtml when hybriding power modules together. But difficulties to get best SWR and insertion loss made me do an investigation. Find that, when using the calculator (and formula) the length should be 38 mm (1.52 inches) @ 1296 MHz, but when checking the resonant frequency it was under 1000 MHz! Start cuttings to have it on 1296 MHz ended up at 29 mm. The isolation, SWR and insertion loss become much better!

Reflection: from abt 12-15 dB improved to 20 dB. Isolation from 18 dB improved to 22 dB and best of all: insertion loss from ~0.5 dB to 0.2 B.

     100MHz/div          

           

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     10 Amp.  NTC-resistance

High "on current" problem solved !

When I turned on the 230 volt AC, high current blow the main fuse (10 Amp.).

The 5 power supplies didn't  start "in phase" maybe ...

I did put two NTC (paralleled) in series with the 230 volt AC and all went OK.

Type nr RTI SG64LF (ELFA 60-292-68 , 88 SKR)

  Type nr

Res.

Max.

Max. res.

Dim.

Wire

Wire

 

25° C

current

at max.

DxT

diam.

distance

SG64

  7

10

0.08

24x13

1.00

7.9

 

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Finaly a SSB QSO !!! LX1DB was 55 at SM5LE and I was 43 at LX1DB. Vy super tnx Willi !

 

LX1DB_SSB.mp3

 

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Measured was: with metallic pole and with glass fiber pole. The metallic pole was simulated by wrapping Al. foil to the glass fiber pole. See pictures. Sun noise and WSJT echo's was used.

#3 different series ; Al. foil "on and off" was done. Mean value for echo's was N=10.

 

 

     

 

Results : the sun noise was 0.2 dB worse (less) with foil and echo's was 0.8 dB worse (less) with foil.

Those results goes for my 2.2 m dish.

 

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Measured sun noise vs. cm focal distance. Y factorfor sun noise level was measured and

the septum feed was moved forth and back from the dish.

Have also putted in the diagram from WSJT4 echo test for comparison.

Looks like the phase focal point is 2-3 cm in into the septum.

"0" , zero , cm is the edge/rim of septum and - (minus) cm closer to dish.

 

The peak are not at the same distance for the curves ; WHY ? comments are welcome.

 

see also :  http://web.telia.com/~u14901544/measured_focal_maximum_gain.htm

 

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Sunclose.htm

 

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SUPER Echo

 

 

 

 

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measured_focal_maximum_gain.htm

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My powerdivider with phaser here :  http://web.telia.com/~u14901546/home_page_no_3.htm

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Nice sigs from K9SLQ giving me 559 :  K9SLQ_559.mp3

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Mesh spetum feed and all pictures abt TX RX etc:  PICTURES CLICK HERE

All pictures abt dish here (this is a Picasaweb page) :  DISH AND SHACK KLICK HERE

CW and SSB EME sound recordings 2.2 meter dish here :  SOUND CLICK HERE

WSJT WAV files here : WAV CLICK HERE

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BIG sigs on 2.2 m dish !

 

HB9BBD_K9SLQ_HB9SV.mp3

 

Own echos not that big 

 

Eko_1_1.mp3     Eko_1_2.mp3      Eko_1_3.mp3

 

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All active (?) calls on 1296 EME that I know of  (Excell doc.) :

All calls more than 1.5 m.xls

 

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 SSB voice clip  ,G4CCH   Charlie Charlie Hotel.mp3

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 Sun shadow from choke ring adjusted !  PICTURES CLICK HERE

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QSL_pictures.htm

 

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My EME station , 1296 MHz :


SM5LE in JO99bd
2.2 meter mesh dish F/D=0.34   (modified SM6CKU 1.8m F/D=0.4 parabola, but with extension to 2.2m gives F/D=0.34)
Septum feed OK1DFC. With choke ring.
250 W @ feed , CW ( 200W JT65 )
Spid RAS rotator with MoonSked software by GM4JJJ
Rig : TS-2000X (with 1296 MHz module).
LNA : NE32684A cavity NF ~0.3 dB
8 dB sun-noise
CW SSB JT65
1296 MHz only

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Summer 2006 - My N.A and S.A. window full of "greengrocery"                                   January 2007.

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SM5LE wrkd inits 1296 EME with 2.2 meter dish.  

      76 CW      +     31 JT65c   =   # 107 inits

# Call Loc Mode Power / dish
         
1 4O/OK1DFC         JN92 JT65C 800 W / 3.2 m
2 8N1EME QM06 CW 500 W / 32 m
3 AD6IW CM87   CW 60 W  / 30 m
4 DF3RU JN59 CW 500 w / 6 m
5 DJ9YW JO42 CW  JT65C 360 W / 4.5 m
6 DK3SE JN37 JT65C 150W / 2.2 m
7 DL0SHF JO54 CW 500 W / 6 m
8 DL1YMK/CX GF15 CW 1 kW  / 4.1 m
9 DL4DTU JO60 CW 250 W / 3.75 m
10 DL4MEA JN58 CW 750 W / 4.5 m
X DL6LAU - CW not vaild as new, is DL0SHF
11 DL7YC JO62 JT65C / 1.3 m
12 ES5PC KO38 CW  JT65C 300 W / 4.5 m
13 ES6RQ KO28 CW  JT65C 350W / 4.5 m
14 F1PYR JN19 JT65C 100 W / 3.5 m
15 F2TU JN38 CW 700 W / 8 m
16 F5FEN      
17 F5JWF JN05 JT65C 130 W / 3.7 m
18 F6KHM IN78 CW 100 W / 10.3 m
19 G3LTF IO91 CW 400 W / 6 m
20 G4CCH IO93 CW /JT65C 400 W / 5.4 m   First 1296 EME ever
21 G4DDK JO02 JT65C 300 W / 2.3 m
22 G4DZU IO93 JT65C 500 W / 3 m
23 G4RGK IO91 JT65C 150 W  /  3.8 m
24 GM3SBC IO85 JT65C 125 W / 3.2 m
25 GW3XYW IO71 JT65C 500 W / 6.6 m
26 HB9BBD JN47 CW 2.2 kW / 10 m
27 HB9HAL JN46 CW / 10 m
28 HB9Q JN47 CW 400 W / 15.3 m
29 HB9SV JN45 CW 600 W / 8 m
30 IK2MMB JN45 CW TH327 / 3.6m
31 IK3COJ JN65 CW 300 W / 3.8 m
32  IQ4DF  JN54 CW 130 W / 7 m
33 IW2FZR JN46 CW  TH308 / 4 m
34  IZ1BPN JN35 CW TH308 300W / 8 m
35 JA4BLC PM65 CW 600 W / 6 m
36 JA4LJB PM74 CW 100 W / 5 m
37 JA6AHB PM53 CW  JT65C 200 W / 7 m
38 JH5LUZ PM63 CW 200 W / 5 m
39 K0YW DM67 CW 1.2 kW / 9.2 m
40 K1RQG FN54 CW 150 W (?) / 10 m
41 K2DH FN13 CW 150 W / 5 m
42 K2UYH FN20 CW  JT65C 500 W / 8.7 m
43 K5GW EM13 CW 1.5 kW / 6.9 m
44 K5JL EM15 CW  1.5 kW / 8.5 m
45 K5PJR EM37 CW 300 W / 5 m
46 K5SO DM65 CW 250 W / 8.6 m
47 K7XQ CM97 JT65C  800 W / 3.3 m
48 K9SLQ EN70 CW 1.3 kW / 9 m
49 KL6M BP51 CW 300W / 9.2 m
50 LA2Z JO59 JT65C 200 W / 4.4 m
51 LA8AV JO49 CW 400 W / 3.7 m
52 LA8LF JO59 CW 500 W / 4.65 m
53 LA9NEA JO59 CW 250 W / 5.3 m
54 LX1DB JN39 CW and SSB ! 1.5 kW / 11 m.   First two way SSB ever !
55 N2UO FN20 CW 200 W / 3 m
56 OE5JFL JN68 CW  100 W / 5 m
57 OE9ERC JN47 CW 2 kW / 8 m
58 OH2DG KP30 JT65C  300 W / 8 m
59 OH3MCK KP11 JT65C 200 W / 4 x 67 el
60 OK1CA JO70 CW 140 W / 10 m
61 OK1DFC JN79 CW 1.2 kW / 10 m
62 OK1KIR JN79 CW JT65C  250 W /  4.5 m
63 ON4BCB JO21 CW 350 W / 4.8 m
64 ON7UN JO21 CW 2 kW / 6.1 m
65 OZ4MM JO55 CW 275 W / 10 m
66 OZ6OL JO65 CW 200 W / 5 m
67 PA0BAT JO31 JT65C 150 W / 3 m
68 PA3CSG JO21 CW 1 kW / 8.5 m
69 PA3DZL JO21 JT65C 150 W / 2.5 m
70 PA3FXB JO33 JT65C 150 W  / 3 m
71 PE1HNG JO30 JT65C 100 W / 3 m
72 PY5ZBU GG54 CW 800 W / 5.5 m
73 RD3DA KO85 CW JT65C 250 W / 3.7 m
74 RK3WWF KO72 JT65C  100 W / 2.1 m
75 RW1AW KP50 CW TH-327 / 8 m
76 RW3BP KO85 CW  JT65C RW3BP  2.8 M DISH  !
77  RW6AG KN95 JT65C 70 W / 3.7 m
78 SK0UX JO99 CW 350 w / 6 M
79 SM2CEW KP15 CW 600 W / 8 m
80 SM3AKW JP92 CW 500 W / 5 m
81 SM3LBN JP80 CW 300 W / 5 m
82 SM4DHN JP60 CW 1 kW / 6 m
83 SP6JLW JO80 CW PA 4xBLV958 / 6.5 m
84 SP7DCS JO91 CW 150 W / 3 m
85 SV3AAF KM17 CW 1  kW / 3.6 m  
86 TF/DL1YKM HP84 JT65C  500 W / 4.1 m
87 SM6CKU JO67 CW 350 W / 8 m
88 SV1BTR KM17 CW 450 W / 3.6 m
89 SV1OE KM17 CW 500 W / 3 m
90 SV3AAF KM17 CW 3.6 m / 1kW
91  UE6YYY LN04 JT65C        3.7 m 75 W   
92 UR5LX KO70 JT65C 150 W / 3.2 m
93 UT5JCW KN64 CWJT65C 250 W / 3.7 m
94 VA7MM CN89 JT65C 200 W / 3 m
95 VE6TA DO33 CW 600 W / 5 m
96 VE7BBG CN88 JT65C 120 W / 3.3 m
97 VK2JDS QF46 JT65C 65 W / 4.6 m
98 VK3UM QF22 CW 180 W  / 8.4 m
99 VK4AFL QG62  CW JT65C  120 W / 3.7 m
100 VK7MO QE37 JT65C 100 W / 2.3 m
101 W5LUA EM13 CW  JT65C 900 W / 5 m
102 W7UPF DM42 JT65C 3m / 200 W  
103 WA6PY DM13 CW 1 kW / 3 m
104 WW2R EM13 JT65C  200 W / 3.1 m
105 YL3AG KO26 JT65C 150 W / 3.6 m
106 Z3/OK1DFC  KN11 JT65C 800 W / 3.2 m
107 ZS6AXT KG33 CW  200 W / 5 m
z z         z z z

 

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My  horizon.     All numbers are degrees.   I need decl. > 10 dgrd.

 

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Echotest after new LNA. The "Cavity LNA".

Indicating   ~1 dB improvement !

Meanvalue sig. -23.4 dB with Dgrd -0.8 dB

---------------------------------------------

WSJT echo test wtih old "Hairpin LNA" 

Meanvalue sig. -24.2 dB with Dgrd -0.6 dB

 

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   Conds 8-9 sept 07   Conds.htm 

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Echo test with new Cavity LNA

(Compared with "old Hairpin LNA")

aprox. 1 dB improvements !

 

 

Sun noise measurements. Difference between old "hair-pin" LNA and the new cavity LNA:

 

  Sun noise in dB Solar flux comments
Old "hair-pin" LNA 6.7 74 mean value for several month
New cavity LNA 8.1 78 only two days measurements

 

aprox. 1.4 dB improvements ! note: flux 74 and 78 difference is 0.2 dB

 

The groundnoise to cold sky did rise from 4.5 to 5.0 dB

 

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Echo testing with WSJT (TX:ed with WSJT4 and RX:ed with WSJT6).

Left "hairpin" LNA (NF=0.4dB) and right cavity LNA (NF=0.3 dB).

 

 

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Measured the difference for an OK1DFC septum feed with and without choke ring, on my 2.2 m dish.

Also measured was ; with poor, almost zero, grounding for the ring on the septum feed.

The outcome from these measurements must be that it is an advantage to have a choke ring also for a 2.2 meter dish.

 

 

All in dB

(Choke ring not grounded)

Septum feed alone

Choke ring grounded

Difference

Comments

Sun noise

(5.5)

5.4

6.3

0.9

 Solar flux 72.5.

Ground noise vs. cold sky

(3.6)

3.2

4.6

1.4

 Grond noise are trees in this case.

WSJT echo

(-29.4)

-28.2

-26.5

1.7

 Both TX and RX are involved.

 Note: Test equipment; Attenuator R&S ”RF step Attenuator” 0.1 dB step and AC voltmeter HP400FL.

Measuring BW ~5 kHz (max for TS-2000) AGC off and RF gain middle , AF gain almust max.

The WSJT echo test is mean value for #20 TX/RX cycle (also note ; higher number [in -dB] is weaker signal).

The diameter for the ring is 42 cm and deep 12cm and possision behind rim 0(zero) λ .

 

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My choke-ring blockage. (In theory).

2.2 m dish is 38013 cm2

Area for ring (42cm diameter) is 1385 cm2

Fictive area: 38013-1385 =36628 cm2

Fictive dish; radius is: r2  = 36628/2π = 36628/6.28 =5833 and √5833=76cm. Gives diameter = 1.52 m

Gain for 2.2m 26.73dBi (VK3UM software)

Gain for 1.5 m 23.31dBi

And finally; ring blockage: 26.73-23.31= 3.42dB

And without ring: Square septum (OK1DFC) 14.9x14.9 cm = 222 cm2

Fictive dish 38013-222=37791 cm2

r2 = 37791/6.28 = 6018 and r=√6018 = 0.78cm and diameter 1.55 m.

Gain for 1.55m 23.60dBi

Gain for 2.2m 26.73dBi

And "naked" Septum blockage : 26.73-23.60=3.13dB

And difference (ring minus”naked” septum) 3.42-3.13=0.29 dB so the ring will add only  ~ 0.3dB blockage.

(Hope that I am right now – hi)    The above is wrong . This is the right solution :

The signal power intercepted by a dish is directly proportional to its aperture (cross-sectional area).  If the aperture of dish without the ring is 38013 cm2 and the active area of the dish with the ring is 36628 cm2 then the loss in signal power due to blockage by the ring is:  dB = 10 log (36628/38013) = -0.16 dB

So ; not ruch for going to offset dish of blocking reasons.

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Superlatives.htm

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My E - mail address :     

 

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Number of visitors: http://web.telia.com/~u14901544/ started 15 januari 2007

 

This is my first attempt to create a home page for my hobby amateur radio.

 My first name is Sven. Born 1940 in Stockholm , Sweden and got my A-license 1961.

My main interest is moon bounce on 1296 MHz. I am using a 2.2 meter dish .

 

 

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