Σάββατο, 23 Ιανουαρίου 2016

Super J-Pole Antenna for the 4m

Super J-Pole Antenna for the 70Mhz (4m) Amateur band.
The Vortex ‘Super J-Pole’ Antenna consists of a five eighth wave vertical radiator, a half wave tuning section and a half wave top section. At the base, a quarter wave matching stub forms the classic ‘J Shape’. The addition of the extra half wave top section boosts the gain over a standard J-Pole. The Super J-Pole has an added advantage that tuning can be varied over a fairly wide frequency range by moving the feed-point location up or down. This also gives the user finer control over the impedance and match. The antenna is end fed and has an omni-directional radiation pattern and requires no ground plane or radials. The antenna has a nice low angle of radiation, typically 8 degrees when mounted at 4m in height. This angle reduces further the higher the antenna is mounted. A typical installation with the antenna at 8 meters above ground sees the angle reduce to 5 degrees and the gain increases to 7.29dbi when ground reflections are added.

INFO: http://ei4dib.blogspot.ie/2015/09/vortex-super-j-pole-antenna-vhf-70mhz.html

Τετάρτη, 9 Δεκεμβρίου 2015

WiFi Wireless Ham Radio Coax Antenna Switch

WiFi Wireless Ham Radio Antenna Switch allows a single transceiver to switch 4 antennas. Free iPhone app on Apple Store. TCP control.

FREE CONTROL iPHONE APP ON APP STORE: ANTENNA SWITCH The WiFi Wireless Ham Radio Coax Antenna Switch 82664XAS01 allows a single transceiver to switch between 4 antennas or 4 transceivers to switch to a single antenna. Full configurable via a web browser. The switch responds to TCP commands. It can handle up to approximately 250 Watts and covers frequencies from 0 to 150 MHz. Control the switch with a free iPhone app AntennaSwitch switch available now on the apple store The switch comes with 2 separate boards: the control board and the connector board. Both boards are connected together with wires. Screw connectors are provided. The WiFi wireless antenna switch allows switching from 4 different antennas into one output to the transceiver. I can also be reverted so 1 antenna can be switched to 4 different transceivers. The switch module can be mounted on a box for convenience and safety. The module is controlled via the simple TCP commands 1, 2, 3 and 4 to switch between the 4 different inputs. Once the module is configured and acquires an IP address, commands can be sent to its IP address and port 9999 to switch between the inputs.