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)

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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

 

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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