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Portable station for QO-100 based on the modules of AMSAT-DL

 

Sept. 27th
2020

 

Portable station for QO-100 based on the modules of AMSAT-DL - Presentation at the AMSAT-DL Online Symposium 2020

 

Sept. 26th
2020

 

Agenda for the AMSAT-DL Online Symposium 2020

 

Sept 19th
2020

 

Surplus filter from NEC retuned from 5731MHz to 5761MHz

 

Sept. 9th
2020

 

Low Noise Frontend for 13cm band EME

 

Aug. 29th 2020

 

How well works a K&L 1990 MHz lowpass filter in the 13cm band ?

 

August 20th
2020

 

A 2m FM receiver for UoSAT designed by G8FXB in 1981

 

August 19th
2020

 

A surplus 4 pole S-band filter modified and retuned to 2320 MHz

 

August 19th
2020

 

A 739MHz bandpass filter for the IF of a QO-100 receiver

 

August 18th
2020

 

A 4 pole bandpass filter for the 70cm band recycled from a UHF duplexer

 

August 15th
2020

 

A surplus 4 pole S-band filter modified and retuned to 2400 MHz

 

August 15th
2020

 

50 Ohm 1250W dummy load SPINNER BN154796

 

July 18th
2020

 

WeatherBox for real-time measurement of atmospheric data and microwave propagation prediction

 

July 3rd
2020

 

A 3D printed encasing for the NanoVNA V2

 

June 24th
2020

 

Evaluation of low-cost Chinese directional couplers 800-2500MHz for the 23cm and 13cm bands

 

June 9th
2020

 

3 GHz O-S-L Cal-Kit with SMA connectors for the Nano-VNA V2

 

June 7th
2020

 

50 Ohm 150W dummy load based on Filtronics 921-0028 load assembly

 

May 23rd
2020

 

Maximum frequency range of the 50Ohm 50W dummy load RS96610-2 from Radiosystem Sweden

 

May 23rd
2020

 

UoSAT-1 bulletins #100 - #109 received by DB2OS

 

May 23rd
2020

 

UoSAT-1 bulletins #080 - #100 received by DB2OS

 

May 23rd
2020

 

UoSAT-1 bulletins #065 - #079 received by DB2OS

 

May 23rd
2020

 

UoSAT-1 bulletins #041 - #064 received by DB2OS

 

May 23rd
2020

 

UoSAT-1 bulletins #010 - #040 received by DB2OS

 

May 23rd
2020

 

Circulator Philips 2722 162 08591 for the 70cm band

 

May 17th
2020

 

Brief comparison of NanoVNA V2 with HP-8753E

 

April 17th
2020

 

2.4 GHz 1.3W power amplifier MHL21336

 

Mar. 21st
2020

 

2.4 GHz 27W power amplifier with MRF21045

 

Feb. 23rd
2020

 

High Power 2320-2400 MHz quadrature hybrid coupler

 

Feb. 7th
2020

 

OSL-Cal-Kit from surplus components

 

Feb. 6th
2020

 

S-band 90 degree hybrid coupler / branch line coupler

 

Feb. 5th
2020

 

Wideband Amplifier MITEQ AMF-3F-01000200-04-13P

 

Feb. 4th
2020

 

Diplexer for 23cm and 13cm band

 

Feb. 3rd
2020

 

2 GHz 125W dummy load based on EMC 5307ALN resistor

 

Feb. 2rd
2020

 

1296 MHz lowpass filter with harmonic notches and integrated reflectometer

 

Feb. 2nd
2020

 

Commercial 2300-2400 MHz band-pass filter retuned for QO-100 uplink at 2400-2410 MHz

 

Jan. 30th
2020

 

1420 MHz Low Noise Amplifier SLN-1420 from SSB-Electronic 

 

Jan. 29th
2020

 

Peripheral Mode Isolator WMI PMI-4444-2 

 

Jan. 28th 2020

 

Characterization of unknown 13cm band isolator

 

Jan. 28th
2020

 

Characterization of unknown S-band isolator 3T-74/097 REV.B

 

Jan. 27th
2020

 

Characterization of the Renaissance 3A4NCG circulator in the 13cm band

 

Jan. 26th
2020

 

ALCATEL FERROCOM 20B1-31 circulator for 1700-2300MHz

 

Jan. 26th
2020

 

Marconi F1094-11 isolator for 1700-2400MHz

 

Jan. 25th
2020

 

2.4 GHz medium power amplifier DG0VE PA13-2-600mW

 

Jan. 24th
2020

 

2.3 GHz low noise amplifier KUHNE MKU LNA 231 AH

 

Jan. 23rd
2020

 

2.4 GHz power amplifier KUHNE MKU231XL

 

Jan. 22nd
2020

 

145 MHz 40W power amplifier based on the Hybrid Module Mitsubishi M57727

 

Jan. 19th
2020

 

Description of wideband amplifier MITEQ AMF-2F-005010-15-10P-L

 

Jan. 12th
2020

 

Connecting the ADALM Pluto SDR to the LAN

 

Dec. 27th
2019

 

Comparison table signal generator phase noise

 

Dec. 22nd
2019

 

2.4 GHz 4W power amplifier MHT1008N designed by DJ0ABR and DC1RJJ

 

Nov. 23rd
2019

 

LimeSDR mini output power at 2.4 GHz as a function of drive level

 

Nov. 20th
2019

 

Unknown isolator for the 70cm band

 

Nov. 18th
2019

 

Description of wideband amplifier MITEQ AFS3-00300300-10-10P

 

Nov. 18th
2019

 

120MHz high pass filter K&L 6LH41-120-2000-0-0

 

Nov. 18th
2019

 

Isolator N70522774 from Xiangyu China for the 13cm band

 

Nov. 17th
2019

 

Isolator N70522768 from Xiangyu China for the 23cm band

 

Nov. 17th
2019

 

4.3-5.0 GHz bandpass filter from surplus BOSCH filter unit

 

Nov. 17th
2019

 

Presentation about QO-100 NB transponder at AMSAT-DL Symposium 2019

 

Nov. 11th
2019

 

Description of R&S NG-Z Over Voltage Protection Unit "Überspannungsschutz"

 

Nov. 4th
2019

 

Portable setup for QO-100 SSB operations

 

Oct. 23rd
2019

 

Transcript of the questions from the students and answers from Luca Parmitano in English including the recorded original sound

 

Oct. 17th 2019

 

Video from the ARISS school contact of Luca Parmitano on the ISS with students of GHSE Emmendingen in Europapark Rust

 

Oct. 17th 2019

 

How to to update the firmware of the AOR ARD-300 Multi-Digital Voice Decoder

 

Oct. 4th
2019

 

Using a Kathrein 791 145 Dual-Band Combiner as a UHF/SHF Diplexer

 

Sept. 27th
2019

 

Optimization and measurement results of the 2m Eggbeater Antenna EGB145RE from ANjO-Antennen

 

Sept. 5th
2019

 

Comparison of Dual-Band Feeds POTY and from DJ7GP for QO-100

 

Aug. 9th
2019

 

MITEQ FTL-104052 BPF retuned from 2240 MHz to 2350 MHz

 

Aug. 5th
2019

 

Homebrew 2.4 GHz 5 pole BPF for QO-10

 

Aug. 4th
2019

 

Homebrew 2.4 GHz 4 pole BPF for QO-10

 

Aug. 4th
2019

 

2400 MHz 90 degree hybrid coupler for instance for QO-100

 

July 27th
2019

 

10 MHz distribution unit with 4 isolated output ports

 

July 13th
2019

 

Case study of a SDR based ground station for Quatar OSCAR-100 - Presentation at Microwave & EME Symposium in Gajow/Poland

 

June 9th
2018

 

Description of wideband amplifier MITEQ 121643-15-17

 

May 22nd
2019

 

Description of widband amplifier MITEQ 121643-10-17

 

May 22nd
2019

 

What's inside the PolyPhaser 101-0103S-A lightning protector

 

May 15th
2019

 

KUHNE MKU-342A LNA for the 9cm band

 

May 1st
2019

 

L-Band LNA-1535 from WILMANCO

 

May 1st
2019

 

ADALM Pluto TX output power at 2.4 GHz

 

Apr. 10th
2019

 

Measurements of TX output power and harmonics of the LimeSDR-USB

 

Apr. 10th
2019

 

How to connect the LimeSDR-USB to the GPIO-Board

 

Apr. 8th
2019

 

Bandpassfilter RTX COH2438.75 for 2400 MHz uplink to QO-100

 

Mar. 31st
2019

 

TX drift measurements at the ADALM Pluto

 

Mar. 25th
2019

 

Dualband Feed for EsHail-2

 

Mar. 25th
2019

 

EsHail-2 / Qatar OSCAR-100 400 Baud PSK beacon - Description of Telemetry Block Format of AO-13 for reference

 

Mar. 14th
2019

 

Be careful with cheap 88-108 MHz band reject filters

 

Jan. 30th 2019

 

Short S-Band helical omni antenna

 

Jan. 25th 2019

 

S-Band Low Noise Amplifier LNA2420

 

January 24th
2019

 

10 GHz LNA built from old KU-band LNB 

 

January 24th
2019

 

Reception results of the engineering beacon of Eshail-1, EsHail-2 and BADR-7 

 

January 22nd
2019

 

Description of the R&S SMBV-Z1 reference frequency converter

 

January 22nd
2019

 

Analysis of an unknown active biconical S-band antenna

 

Jan. 21st 2019

 

What's inside the Kathrein antennas for trains and uses 

 

Jan. 16th 2019

 

Homebrew DC Dummy Load to test power supplies 

 

Jan. 10th 2019

 

Analysis of the 12 GHz prescaler teil12-100-1000 from DG0VE

 

Jan. 7th 2019

 

Analysis of the 10 MHz Inserter / Extractor from Global Communicatons

 

Jan. 5th 2019

 

Frequency Doubler from 3.1-6.4 GHz to 6.2-12.8 GHz based on HMC204MS

 

Jan. 4th 2019

 

What's inside the 5.5 GHz high-pass filter HPF5500M 

 

Jan. 4th 2019

 

Description of wideband amplifier MITEQ AMF5S-040080-12-13P-V 

 

Dec. 2nd
2018

 

Transmitting DATV with DATV-Express and the LimeSDR

 

Nov. 24th 2018

 

Low Noise Amplifier for 23cm band EME

 

Nov. 4th 2018

 

Simple rotator interface based on N1VF adapted to Vicon V380PTX PZT

 

Nov. 1st 2018

 

Description of the Isolator Melabs Model H350-153,4T

 

Sept. 16th 2018

 

Analysis of a chinese wideband low noise amplifier based on SPF5189Z 

 

Sept. 2nd
2018

 

Analysis of a chinese broadband Bias-T 10 MHz to 6 GHz

 

Sept. 1st
2018

 

Description of wideband amplifier MITEQ AFS3-08500960-15-10P-TC-4

 

Aug. 27th
2018

 

Using CHIRP with a RT-Systems USB-Adapter to program the YAESU VX-8R 

 

Aug. 13th
2018

 

A low cost signal generator for 54 MHz to 13.4 GHz based on ADF5355 - Presentation at Microwave & EME Symposium in Gajow/Poland

 

June 9th
2018

 

3D printing a 1U Cubesat

 

Jun. 5th
2018

 

What's inside the PolyPhaser 098-1013G-A lightning protector

 

June 2nd
2018

 

Retuning a L-Band branch line coupler

 

May 10th
2018

 

Description of the LTE Blocking Filter 67510

 

April 23rd
2018

 

The WellGood active loop antenna tested with the Airspy HF+ SDR

 

April 10th
2018

 

Improving the ADF5355 synthesizer board (Version with Touch-Display)

 

Mar. 24th
2018

 

Dressler ARA-2000 active wideband antenna - what's inside ?

 

Mar. 13th
2018

 

Retuning a Microdyne Tubular BPF to 2200-2300 MHz

 

Feb. 25th
2018

 

Description of wideband amplifier MITEQ AFS3-04000200-13-LN

 

Feb. 20th
2018

 

Analysis of HP 5086-7271 Microwave Power Amplifier

 

Feb. 6th
2018

 

10 MHz reference source with automatic switching between OCXO and external reference

 

Feb. 6th
2018

 

Description of Huber + Suhner Lowpass Filter 2500 MHz

 

Jan. 29th
2018

 

Description of wideband amplifier MITEQ AMF-5S-107117-12-13P

 

Jan. 27th
2018

 

Analysis of the 5.4 GHz Diplex-Filter M00090-01-06 from Elettronica Roma

 

Jan. 26th
2018

 

Description of the Fixed Bandpass Filter 612608-001 from Watkins Johnson

 

Dec. 20th
2017

 

What's inside of a Dressler ARA-30 active antenna?

 

Dec. 1st
2017

 

Description of K&L Bandpass Filter 5B120-2450/180-O/OP

 

Nov. 24th
2017

 

Commercial L-Band dielectrical bandpass-filter from Lorch

 

4. Nov.21st
2017

 

Description of the MASPRO 2SPN8 Satellite 2-way Splitter

 

Nov. 1st
2017

 

What's inside this noname Chinese lightning protector

 

Oct. 9th
2017

 

RF-Systems DX-one Active Amplifier rebuilt with New Amplifier by Ulrich HB9AIK

 

Sept. 25th
2017

 

Description of wideband amplifier MITEQ  IFS4-00101275-45-10P 

 

July 21st
2017

 

Description of wideband amplifier MITEQ AFS3-00100300-25-23P-6S 

 

July 21st
2017

 

Description of wideband amplifier Herotek A1812-119C

 

July 21st
2017

 

Description of wideband amplifier Herotek A152-198

 

July 21st
2017

 

Description of Huber + Suhner Lowpass Filter 2600 MHz

 

July 18th
2017

 

Description of K&L Lowpass Filter 13IL10-1920/X2200-N/N

 

July 18th
2017

 

Description of K&L Highpass Filter 11SH10-2400/U13000-N/N

 

July 18th
2017

 

Description of some surplus Power Dividers from Merrimac

 

July 1st
2017

 

Modification of the Worldspace Antenna ANA-10L for wideband use

 

May 1st
2017

 

Measurement results of a Worldspace 15V low noise amplifier

 

May 1st
2017

 

Measurement results of a Worldspace 2,3V low noise amplifier

 

May 1st
2017

 

Description of the Anritsu MS616B Modulation Analyzer

 

May 1st
2017

 

Instruction Manual FM-AM Signal Generator Boonton Model 102D

 

May 1st
2017

 

A proper metal encasing for the Lime-SDR

 

April 30th
2017

 

Service Manual AOR AR-8600 receiver

 

April 30th
2017

 

Radio Amateurs who are also a member of the NexStar Yahoo group

 

June 23rd
2016

 

MIRNEWS - Collection of most of the excellent bulletins issued 1991-2001 by Chris van den Berg

 

April 24th
2016

 

Description of the wideband amplifier Picosecond 5812

 

Feb 28th
2016

 

VHF/UHF satellite frequencies for Frequency Manager in SDR#
(based on frequency tables from Maik Hermenau)

 

Aug. 19th
2015

 

Description of the tunable bandpass filter Telonics TTA-1500-3-5EE

 

Jan 10th
2015

 

Orbitron Note Files

 

Mar. 15th
2014

 

Low Noise Amplifier HFC LNA-4000

 

Oct. 13th
2013

 

A rubidium frequency standard as a precise reference frequency source for the ham radio station

 

Sep 29th
2013

 

Standard AX700E - Scanning Receiver with Panoramic Display - Brochure

 

March 26th
2013

 

Extending the frequency range of a Hyperlog 7025 / 7040 logarithmic periodic antenna

 

April 20th
2012

 

Low Noise Amplifier LNA-3000 SSB-Electronic

 

Mar. 11th
2012

 

Automatic antenna switch for the AOR AR5000 receiver

 

Jan. 5th
2012

 

Description of the Accesssory Ports of the AOR AR5000

 

Jan. 3rd 2012

 

Simple DOS Software to control the rubidium standard FE5680A

 

Jan 2nd
2012

 

Main differences of Radio Direction Finder DDF6001 compared to DDF6000

 

Dec. 26th
2011

 

Directional Power Meter RFM 100 from Rohde & Schwarz - English Flyer

 

Dec. 25h
2011

 

Radio Direction Finder DDF6000 from Doppler Systems at a first glance

 

Dec. 9th
2011

 

Service Manual of the Standard AX-700 receiver / scanner (56 pages, 31 MBytes)

 

Sept 24th.
2011

 

 

What's inside a SSB-Electronic K1701G downconverter (by Marco Bauer)

 

Aug 6th
2011

 

Inside the SSB-Electronic ACS-204 antenna switch system

 

July 2nd
2011

 

What's inside an X-Phaser

 

July 2nd
2011

 

A vintage 2m - 70cm transverter from uk-elektronik (looking for information)

 

June 24th
2011

 

How to control (reaction tune) a AOR AR-8600 receiver using a ACECO FC-3002 frequency finder

 

June 2nd
2011

 

Table of artificial satellites launched in 1992

 

April 15th
2011

 

Table of artificial satellites launched in 1993

 

Nov 13th
2010

 

Table of artificial satellites launched in 1991

 

Oct 17th
2010

 

Table of artificial satellites launched in 1990

 

Oct 17th
2010

 

Table of artificial satellites launched in 1989

 

Oct 17th
2010

 

Table of artificial satellites launched in 1988

 

Oct 17th
2010

 

Table of artificial satellites launched in 1987

 

Oct 17th
2010

 

Table of artificial satellites launched in 1986

 

Oct 17th
2010

 

Table of artificial satellites launched in 1985

 

Oct 17th
2010

 

Table of artificial satellites launched between 1977 and 1984

 

Oct 17th
2010

 

Table of artificial satellites launched between 1957 and 1976

 

Oct 17th
2010

 

A comparison of active magnetic loop antennas

 

May 8th
2010

 

A strange logarithmic periodic antenna design - a short analysis

 

April 1st
2010

 

Analysis of the "Electronic Antenna" - a novel antenna design

 

April 1st
2008

 

A surplus 8 GHz down-converter from NERA

 

Jan 26th
2008

 

Schematics of the Standard AX-700 receiver / scanner

 

Jan 13th.
2008

 

J.I.L. SX-400 Wideband Receiver/Scanner Schematicsl

 

Dec. 24th
2007

 

J.I.L. SX-400 Wideband Receiver/Scanner Service Manual

 

Dec. 24th
2007

 

J.I.L. SX-400 Wideband Receiver/Scanner Owners Manual

 

Dec. 24th
2007

 

Homebrew S-Meter for the AOR AR8600

 

Oct. 6th
2007

 

A new toy in the Radio Shack: the ICOM PCR-1000 wideband receiver (a review and tips for improvements incl. DRM)

 

March 03rd
2007

 

An RF Proof 30 Amps Power Supply

 

Dec 29th
2006

 

Short analysis of the Hawkins WiFi Signal Booster

 

Sept 10th
2005

 

How to modify the ICOM IC-735 for DRM reception

 

July 11th
2004

 

200 mW power amplifier for 2.4 GHz

 

Dec. 22nd
2002

Please note that I retain the copyrights on all articles. If you want to make use of them other than for your personal purpose please send me a request to


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