Inac, has a tuneable magnetic antenna of remote drive and with a fast syntony of less of a second of end to end of the band. The magnetic antennas have the same basic configuration, of coil and condenser. As it is evident, to be able to cover all the phantom with the bands of radio ham in HF, is to say from 1.6 to 30 Mhz., it is had to have different capacities and different coils. The coils determine the inductance that, like norm, we can say to him that, for greater diameter of I pull ahead, greater inductance. For that reason for 4 frequencies from 1.6 to Mhz., the size of the coil for an acceptable yield is of 3.4 meters of diameter and on the other hand for higher frequencies, like 30 Mhz, is enough with not arriving at a meter of diameter. In our case we have created a central model that covers the band, from 5 to 21 Mhz. The condenser is handled of remote way and the performance control, the one that it places in the quarter of the radio, moves directly as if actuasemos on an axis of a hypothetical variable condenser. With the advantage of appreciating on simple ear the presence of noise in the tune band, thus indicating, the entrance in syntony of the antenna. I pull ahead of our antenna is of rectangular form 83 cms of wide by 63 cms of stop of asymmetric structure, with the idea to equip it with different lobe from radiation, by each end of I pull ahead, by allows a small sense it of directionality. The maximum power depends on the band. To greater frequency the maximum power is greater, arriving at the order of 1 kW. The frequencies covered and basic characteristicses with the antenna are as it determines the following graph:

AH-521	5 Mhz	7 Mhz	14 Mhz	21 Mhz
Max Power over 50, Ohm.	350 W	400 W	600 W	1100 W
Yield %	34%	42%	77%	83%
Pasante Band in +/- Khz	60Khz	48Khz	31Khz	20Khz

It is not scared of the numbers that are always inferior to 100, since it is being compared with an ideal dipole always cut to the work frequency, thing on the other hand impossible to take to the practice, since the dipoles do not stretch or they shrink according to our desires of work frequency, reason why the yield is very bad, but the work of a dipole in the 160 tómese like reference band of 80 or mts, where the operation gets to be impossible outside the cut frequency. And of course it forget of the use of the coupler in the exit of the transceiver, that only disguises the problem.

 

 

 

Reduced size, with relation to the half-wave dipole. With measures of 85x65 cms in model AH-521.

Relation of standing waves better than 1.2 in all the covered band.

It works without plane of earth

It hardly does not have losses by absorption of metallic structures or concrete, reason why it is possible to be made work inside buildings or in a balcony.

Its high " Q " causes that she is very selective behaving as a filter in RX and TX.

He is immune to the electrical QRM and the intermodulation of near or very powerful transmitters.

Remote control of the adjustment of the condenser.

Sense of directionality, thanks to its asymmetry of manufacture.

 

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