I have four of them, with a V-band bandwidth of 2.5 MHz and an U-band bandwidth of 17 MHz. However, the performance of these antennas is inconsistent; each one has different specifications.
Do not drop it once you have it; if you do, the segment will be skewed. The solution is described later.
A ham radio operator with a standing wave tuner can try to adjust it themselves; do not use small bandpass filters, as they cannot simulate the environment of a handheld radio.
Use a wrench to tighten it securely and then pull it out with force; there's essentially no adhesive inside.
When testing with standing waves, hold the standing wave meter in one hand to simulate a handheld radio environment. If both the UV dual-band center frequencies are simultaneously too low or too high, simply shorten or lengthen the corresponding spiral coil slightly. If the U band is normal, but the V band center frequency is off, adjust the distance between the coil and the lower inductor. Alternatively, create a gap of a few millimeters between the top ring and the middle of the second ring using your fingernail.
After each adjustment, measure the standing wave. Make sure everything is working correctly before proceeding. Then, use hot glue or heat shrink tubing to securely fix the coil and the lower part of the oscillator, preventing it from being damaged and causing frequency drift.
A was purchased from Hua Hong on Taobao and has not been adjusted.
The BCD units were purchased from two different vendors on Taobao and I adjusted them myself.
Tomorrow, also adjust A, and then take a picture to include it.
闽ICP备2021006864号-7
闽公网安备35020602002794号