fig. 4
3,5 MHz
7 a 10 MHz
fig. 5
fig. 6
B P L U S T V a . s .
MLA-M
page 2
MLA-M
3. Mode 10-28 MHz
Loop consists of one turn, the jumper J1 is switched on and the
jumper J2 is switched off, see fig. 3.
Unusual method of tuning of the MLA-M by means of two
variable condensers does not represent any complication in
case of desk-top design. Circuit works by analogous way as a
classic matching circuit. This type of circuit favourably enables
exact tuning of the antenna in whole range of HF frequencies
and input impedance is very near to 50±j0 Ohm. For another
types of feeding circuits for magnetic antenna it is in principle
unpossible. Switching among low and high bands by means of
mechanical switching of jumper inside the box of antenna
14 - 28 MHz
fig. 3
J2
J1
represents in case of desktop design of MLA-M also no problem, see figs. 4-6. It is necessary to emphasize
that without using SWR-meter is exact tuning not simple, at least during the start of this procedure.
B PLUS TV a. s., Po
ž
árnická 140, 742 83 Klimkovice, Czech Republic
phone: +420 556 420 360, fax: +420 556 420 301
e-mail: [email protected], http://www.btv.cz
