Please enable / Bitte aktiviere JavaScript!
Veuillez desactiver vos / Por favor desactiva el Javascript![ ? ]
Ham Radio Amateur Articles | Radioaficion Ham Radio

Ham Radio Amateur Articles

ARISSat-1 Deployed After Delay

http://3.bp.blogspot.com/-nqT0NxH5IMA/TaRzYg_NmLI/AAAAAAAAAEE/2CwJV_0454U/s200/ARISSat-1logo.png

The ARISSat-1 amateur satellite was deployed by spacewalking cosmonauts today at approximately 1845 UTC, according to minute-by-minute postings by CQ VHF staff on the CQ VHF magazine Facebook page. The deployment was delayed for about three hours after the satellite was taken outside the International Space Station due to questions regarding one of its antennas. Ultimately the decision was made to toss it into space and put it in orbit! No word as of this posting as to whether the satellite is functioning independently. You may follow progress on the ARISSat-1 web page. Posted by CQ Newsroom

RadioJet 1102S Bonito shortwave receiver

Bonito shortwave receiver RadioJet 1102SNew Bonito shortwave receiver RadioJet 1102S

You won't believe your ears!
The new Bonito shortwave receiver RadioJet 1102S combines innovative design with the advantages of modern computer technology. It has a frequency range of 0,04 MHz to 30 MHz with an excellent sensitivity of .03 µVolts on a noise level of -137 dBm with an extreme resolution of 144 dB at a bandwidth of 24kHz. The Noise floor is extremely low, because there are no active parts between the Antenna and the ADC.

Strictly speaking, this radio is no SDR, although it is exclusively controlled by computer. So far no SDR has defined, controlled, read or computed anything like the RadioJet. Bonito RadioJet is a short wave receiver with a built-in USB Audio device and a 24kHz multi-channel IM jack or to put it simply:

SARK-110 Antenna Analyzer

The SARK-110 is a pocket size, stand alone antenna vector impedance analyzer that makes available a multitude of features and capabilities which are perfect for checking antennas, antenna feed lines and RF circuits for radio amateurs and hobbyist both in laboratory and in a field operation.

The analyzer features a Direct Digital Synthesis (DDS) generator with a range of 0.1 to 200 MHz and a frequency resolution of 1 Hz. The measurement part provides a precise measurement of the impedance vector including the true determination of the sign of the reactance. Besides it is provided the Open/Short/Load calibration standard for accurate results.


RF Power Reference for power meter calibration

homebrew RF Power Reference for power meter calibrationSimple RF Power Reference For RF power meter calibration

You’ve just finished building a new RF power meter, like the ABPM from Down East Microwave (www.downeastmicrowave.com) – how do you calibrate it?  Or perhaps you’ve acquired a surplus unit
– how do you check the calibration?  You need some known reference point or a friend with a calibrated meter.

Some recent commercial power meters, like the HP 435, include a reference output to check and set
the calibration of the meter.  These fine meters are occasionally found as surplus at very reasonable prices, probably because the RF sensor heads command such exorbitant prices that the meter alone is unattractive.  However, the meter is worth a modest amount for the reference output alone, to be used to check other power meters, either homebrew or older surplus.

Bird Wattmeter Calibration and Repair

Calibration and Repair for Bird Wattmeter Elements

Follow these simple, easy steps—and save big money!

by Francis Kelson HL9BK/K2KSY

Some time ago, I received some burned out and well-used Bird and Sierra wattmeter elements. As I looked over the elements, 1 wondered if ii was possible to gain access to the passive and active elements inside for replacement or restoration. At 55 bucks per, I figured it was worth my time and effort to check it out, since 1 had well over a thousand dollars worth laying on the bench in front of me. My investigations paid off handsomely.

Dutch communications tower collapses after blaze

A fire caused a partial collapse of a 300-metre communications mast in northern Netherlands Friday, knocking out television and radio stations, a local municipal official said.

Dim lights

The fire at the 300-metre-high (984 feet) television mast in Hoogersmilde in the Drenthe province, about 160 kilometres (100 miles) northeast of Amsterdam, broke out around 2:00 pm (1200 GMT), said Midden-Drenthe municipality spokeswoman Miriam Fokkema.

"There was a fire shortly before 2:00 pm and then at about 3:45 pm the upper part of the mast collapsed," Fokkema told AFP.

Dutch news agency ANP said a 200-metre-high metal mast collapsed on top of a 100-metre concrete tower after the fire broke out.

"Nobody is believed to have been injured," said Fokkema, adding that the area suffered severe communication problems with the tower used as a major broadcast hub for television, radio and telephone communications.

RTVE

Se derrumba una torre de comunicación en Holanda

RemoteRig Demonstration in Spanish

Remoterig Remote Control your station over the internet

Dim lights

Page 48 of 102