Tuesday, November 3, 2020

USING R75 AND LOOP ANTENNA 1 x 1 m

 

1st  part:

 

Checking  loop antenna in inductive  or direct connection

Date of experiment :  9/2/2k

QTH: Retziki 20N 23E Thessaloniki  , reception made outdoors ( not inside the house)

An experiment with this 1 x 1 m loop antenna , with direct connexion and inductive tuned connection

 The antenna was in fixed position Preamp was on ( + 10 db)

 

win

S

S-direct

STN

8

2

-

 

 

9

2

 

 

3

-

 

 

3

-

 

 

9

4

 

7

9+10

9

 

7

8

5

 

 

5

2

 

 

4

2

 

 

9+10

6

 

 

5

-

 

7

3

-

 

6

8

5

 

6

6

3

 

 

 

4

FR

 

 

7

TU

 

 

3

 

 

 

5

æTHSÆ beacon

 

Result:

Direct connection does not offer antenna tuning operation , but shows a constant (?) gain on all the LF bands but inductive coupling can offer better signals abt 12-15 db

Legend :

QRG : frequency
Win: windings
S ; S meter with inductive coupling , properly tuned
S- direct : direct connection to receiver
S meter readings: S2/S1 = 6 db ( 4 times stronger)
Over S9 readings always per 10 db ( x 10)


 

PART 2

Resonance  of the 1 x 1 m antenna

Mysteriously , the 1 x1m antenna  shown some resonance with ONLY  the wideband  receiver MVT7100 by direct or by indirect (inductive coupling) but with R-75  it  did not shown  any resonance except what  the R-75 should  listen !

Direct  connection  with MVT 7100 :

Windings Freq bands
8 ?
7 9.5 MHz
6 11.5?
5
4 13.6 at max
3 17.5
2 co conn
1 17.5

Inductive coupling with 900 pF capacitor ( always  used) and MVT7100 and 3 m double wire connection

Windings Freq bands
8 MW
7 MW
6 MW
5
4 5.4-4.2
3 5.8-3.7
2 co conn
1 6.8-7.5

 


 

Part 3

LOGS MADE WITH THE 1 x 1 m antenna

Date: 11-2-2k

QRG Stn UTC comments Signal S meter reading

1413

R National 5 SP

2022

talks by man 33433 mix with BBC?

 33423  

1422

Dfunk GE

2015

nice guitar play ID ayt 2025 ,

43443

 

1431

RAI 2

2025

music and talks much of echo ( Lux effect or twin xters?)

3?423

[9]

1449

RAI 2//1431

2033

news 32443 [7] carrier on +300

   

1485

Rai 2    //1431

2040

adverts

22412

 

1575

RAI

2048

interview

44444

[S9+10]

1611

R vaticano

2052

in pilipino (?) and EG words , seems discussion , prg on valentine

44444

 

1600.75

ERA 2

2055

r. stn , traditional sx , LSB only

33443

 

1368

RAI 3?

2120

variety prg  Galei Zahal underneath

 44444 [S9]

1296

COPE û SP

2127

talks, signal otherwise covered by Bulg

22422

 

1268

COPE?

2133

talks in SP -----

   

1242

Kiev

2137

old RR songs

2xxx2,

 

1242

MRT-Skpj

2137

ID??( hrd once only)

 

[S3-4]

1242

R Bleu ûFR

2136

( main signal this QRG )music

 

[S7]

1170.9

R Kapodistria SVN 2148

 ID 2148

nice pop songs

 43443  

1143

RAI

2200

songs, talks

32xx3

S9]

1053

COPE

2206

talks by 2 OM

43443

 

1035

RAI

2210

songs not suffreed by the local stn on 1044[S9+20]

34433

[S8.5]

873

AFN ûG

2226

interviews , AmE

22422

 

831

R Damask

2232

SYRIA talk OM , YL and msx,

 

[S5]

675

R 10-FM

2246

HOL song , ID 2246 , old songs

33443

 

527

R vaticano

2309

music , 2312 ID , carrier +USB

 323  

 

 

 

 

 

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