Presented FM transmitter bug is built using BF414 / BF324 / BF606 transistor. The 30cm antenna has a range of about 30m in the building, more in the open field. Power supply 2x AAA batteries have been used with voltage of 2.75 V. I added resistor 10K in parallel with 1.5pF capacitor so that the system works well when connected to an external source (mp3 player / computer). On the computer I had to reduce sound to about 35% of capacity, so that I do not have clipping. I managed to improve transmitter stability with simple shielding. The coil is 5 turns of enameled copper wire wound on 1 mm ø = 5 mm.
Figure B
Homebrew Antenna Tuner - AA5TB
this project is about a cheap way of building a colinear antenna for vhf 145mhz and having about 10db more gain than that little 1 4 wave magmount . Listed under the Antennas/Collinear category that is about Collinear antennas.
There has been a lot of interest in the Vackar oscillator lately because of recent (1968) articles describing its many merits. Although there hasn't been too much information on this circuit in the American magazines, a wealth of information has been published in the RSGB Bulletin. In addition,
Hola a todos. Recientemente he adquirido un ICOM 910H. Claro! He tenido que ponerme las pilas porque lo he comprado de segunda mano y estaba bastante ...
________________________________________________________ TABELLA LUNGHEZZE ANTENNE IN METRI x config.
...สายอากาศ Moxon คิดค้นโดย Les Moxon นามเรียกขาน G6XN เป็นสายอากาศที่สร้างง่ายอีกชนิดหนึ่ง เหมาะสำหรับผู้ที่ชื่นชอบการสร้างและทดลอง...
80/40 Meter Attic Antena
I will leave France at mid-November to Réunion Island, and there get on board of "Marion Dufresne", the supply ship of the french austral territories. It will take approximately 10-15 day to reach the Kerguelen archipelago with a stopover at Crozet a
