Features:
20w qrp small loop antenna loop antenna for high frequency transceiver ICOM-705 5-30mhz 76-108mhz 110-150mhz 400 ~ 450mhz
This is a portable small loop antenna. It is easy and quick to set up the antenna for your shortwave transceiver antenna. Anti-interference, low standing wave, strong directivity, full frequency ba nd. Thus, allowing you to enjoy multi-band reception and communication indoors, win dows, balconies and outdoors.
Frequency Range:
144-148MHz
430-440MHz
7-30MHz
aviation frequency band
FM radio also provides excellent reception
Tuning box:
Frequency band selection switch, pull up 7MHz, pull down 14-30MHz
The upper knob is the frequency tuning knob, and the frequency tuning value does not change due to environmental changes.
The lower knob is the impedance matching knob, and the impedance matching value will change due to environmental changes.
Data transmission: 10W
SSB: 20W
FM radio also provides excellent reception
Product parameters
Frequency range: 7MHz-30MHz. aviation frequency band,.
Use a right-angle adapter and a double male docking connector to connect the antenna to the M base on the back of the radio and stand it up, or connect the ring body to the connection bases on both sides of the controller and tighten it, then install the tripod to the fixed base on the back of the tuner , open the tripod, place the antenna body firmly on the tripod, and finally connect the feeder (the feeder is attached with a choke, and on e end of the choke is close to the small loop antenna).
method:
Now that the small loop antenna is connected to your station, you can now listen.
First, let’s introduce the functions of the tuner panel. The toggle switch on the left is the frequency band selection switch (upper: 7MHz, lower: 14-30MHz).
Main control knob, the upper knob is the frequency tuning knob, the frequency tuning value will not change due to environmental changes; the lower knob is the impedance matching knob, the impedance matching value will change due to environmental changes. (The adjustment range of the two knobs is 180 degrees, and the panel value is 0-12).
When starting to use the radio, select the required frequency, then move the band switch to the required band position, then adjust the impedance matching value of the lower knob to 6, and then adjust the upper knob to tune. At this time, pay attention to the background noise of the radio station. The more resonance there is, the greater the noise floor of the station. At this time, let the radio transmit (CW, FM, AM modes are available), pay attention to the standing wave indication, and fine-tune the frequency tuning knob when transmitting. Since the knob of the portable version does not have a deceleration function, the fine-tuning method must be more delicate, and the smaller the rotation angle, the better.
At this time, obvious changes in the standing wave can be observed, but the minimum standing wave ratio is generally not less than 1.5. At this time, the impedance matching knob needs to be adjusted. It is recommended to randomly adjust plus or minus 5 scale values, and then repeat the steps of frequency tuning and observing the standing wave ratio. Due to the change of the matching value, there are two possibilities before comparison, 1: the minimum value of the standing wave ratio decreases; 2. the minimum value of the standing wave ratio increases. If the minimum value of the standing wave ratio becomes lower, it means that the impedance matching adjustment is close to the correct value and further adjustments can be made. If the minimum value of the standing wave ratio becomes larger,
Repeat the above steps to adjust the antenna's VSWR to 1.0.
For VHF and UHF frequency bands, the upper knob is fixed to 12, and the lower knob can appropriately adjust the impedance resonance.
Note: It is best to use it outdoors. The antenna should be used indoors as close to the win dow as possible, in a fully enclosed environment with reinforced concrete, or against a wall. The standing wave ratio in some frequency bands is not ideal.
Advanced tips: When the signal is weak, you can rotate the antenna direction to improve the signal-to-noise ratio and facilitate reception. The loop antenna's unique gain lobe gives it horizontal gain directivity when upright. Using its characteristics, multiple signals in the horizontal direction can be selected in a targeted manner, and co-channel interference in the horizontal direction can also be reduced. Of course, if the interference signal is extremely strong and is much larger than the useful signal that needs to be received, the weakening effect will not be too obvious, and it can still play a weakening effect compared to the telescopic antenna.
Scope of use:
Short wave: 5 ~ 30 MHz adjustable
Power: 20W
- SWR:
FM: 76~108MHz
V band + aviation band: 110~150MHz
U segment: 400 ~ 450 MHz
Shortwave Tuning Reference Value
Frequency 1 button scale value High and low selection 2 button scale value
5MHz 5 under 35
7MHZ 20 under 45
10MHZ 30 under 60
14MHZ 45 on 25
21MHZ 55 on 38
29MHZ 60 on 50
Package Included:
1 X small loop antenna
1 X 2 meter transmitting antenna
1 X 5 meters 50 ohm coaxial cable
3 X adapter
Note:
1.The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.
2.Please allow slight manual measurement deviation for the data.
