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2m Receivers

Click to enlarge A 144MHz FM/SSB Receiver by DL5NEG
After I had developed a couple of shortwave and VHF-FM Receivers in my sparetime, I decided to develop an allmode receiver for the 144 MHz amateur radio band as my university graduation thesis.

Click to enlarge 2-meter AM Vossenjacht ontvanger 2002 door PA3GBV
Dit ontwerp is oorspronkelijk afkomstig van de Zelfbouw Aktiviteiten Comm. van de VERON afd. Eindhoven. Omdat ik de gegevens alleen op papier had, heb ik de schema's en tekeningen gescand en de tekst overgenomen.

5 transistor 144MHz FM receiver by JF1OZL
In order to hear the 2m FM band, I made a simple radio. In these days I began to use the transistor having ft over 1GHz. They can make gain over 40dB when they are used on IF amplifier.

A Complete FM Radio on a Chip by YBØAH
This is a very useful and simple Signetics single chip FM receiver Integrated circuit product I've ever found I got this late 1985 in Akhihabara Electronic Market Tokyo.

Direction Finding System by SMØVPO
Many years ago I decided to build myself a Direction Finding (DF) system just after I had won my first VHF "fox-hunt" with the DF-Antenna in the Cambridge & District Amateur radio Club.

VHF Regenerative Receiver by 4S7NR
Looks very simple. But need bit experiance to build this receiver. It can be tuned from 140 to 150 Mhz covering the whole 2m band. This has a Super Regenerative detector. When properly tuned the receiver is very sensitive.

Click to enlarge VHF Super-Regenerative Receiver by VK2ZAY
I have started straight with the circuit out of the ARRL handbook, by Charles Kitchen N1TEV. I didn't have a 6v8 zener, or a few other part values, so I had to substitute a bit.

Click to enlarge Another VHF Super-Regenerative Receiver by VK2ZAY
Similar to my other VHF Super-Regenerative Receiver this design borrows heavily from Charles Kitchen N1TEV's various published designs.

Click to enlarge VHF/UHF Ontvanger by PA2RF
In de Elektuur HF special uit 1993 een relatief eenvoudig maar zeer doeltreffend ontwerp van een VHF/UHF ontvanger beschreven.

Click to enlarge VHF/UHF RX/TX Monitor by SMØVPO
It seems that many QRP circuits are all usually transmitters but I believe that receivers are quite important too. In this project you can build a SIMPLE receiver for VHF NBFM and the only active component is a diode.

Click to enlarge ZN414 Receivers by SMØVPO
This is a project from the dim and distant past which has proved to be a real winner. I have used it as the basis for an 8 channel proportional R/C (AM) as well as a 145MHz FM "chat box".

Click to enlarge 144 MHZ to 28 MHZ 2nd Down-Converter for AO-40 Sat by SV1BSX
On the "CAL-Ampl 31732" 2,4 GHZ Down Converter", it's possible to replace the original Xtal of 8,500 MHZ with a new 8,8125 MHZ. This way we have an output of DownConverting frequency from 2,4 GHZ to 144 MHZ.

144MHz to 50MHz receive converter by XQ2FOD
My satellite station is centered around a Yaesu FT736 transceiver. I have it equipped for 6m, 2m, 70cm and 23cm. And then the AO-40 satellite came around, with the 13cm band ending up being its only viable downlink.

VHF Receive Converter by EI9GQ
This converter is very sensitive. I can hear the Waterford repeater, about 160KM away. Reception of weak signals is superior to most commercial 2M rigs.


2m Transceivers

144MHz All Mode Transceiver by VA3IUL
The main characteristic of the transceiver presented below it is the simplicity, but in the same time to obtain good performance with a minimum investment. The principal component of this radio it is MC3362.

Click to enlarge DSP-10 Project by W7PUA
The DSP-10 is an amateur-radio, software-defined 2-meter transceiver that can be built at home. It operates on SSB, FM and CW modes. Features are tailored to operation with weak signals.

DSP-10: An All-Mode 2M Trx Using a DSP IF and PC-Controlled Front Panel by W7PUA
Part 1-What’s neat about this 2-meter transceiver is that most of it is in software! Your PC is its front panel. You can operate it as a stand-alone QRP rig, with an amplifier or with UHF and microwave transverters!

DSP-10: An All-Mode 2M Trx Using a DSP IF and PC-Controlled Front Panel by W7PUA
Part 2-This versatile 2-meter transceiver uses a PC as its front panel. With most of the radio in software, the mechanical construction of the radio is much easier to handle.

DSP-10: An All-Mode 2M Trx Using a DSP IF and PC-Controlled Front Panel by W7PUA
Part 3-This is it! It's about time to put your new transceiver on the air!

The Fredbox: A 10mW 144MHz AM Handheld Transceiver by G3XBM
This is the story of the Fredbox, a rig that first saw the light of day in 1974 in Cambridge. In the last few months it has been restored to full working order to enjoy the renewed interest in AM operation on 2m in the UK.

Fredbox: 2m AM Transceiver by GØUPL
Size is 145 x 57 x 29mm (excluding switch, sockets etc.). The case is made from single sided unetched PCB.
See original Fredbox at G3XBM's homepage.


2m Transmitters

Click to enlarge 144MHz ARDF transmitter by ON7YD
The hart of the transmitter is the integrated circuit ICS501 that allows it to generate a stable a clean signal on 144MHz using just a few components.

Click to enlarge 144MHz CW Transmitter by OZ2CPU
Block Schematic of my homemade 144.000 MHz CW 1.5Watt transmitter. The Xtal osc is riped from an old AT-PC running 16MHz, it requeres 5.0 volt and use 18mA.

Click to enlarge 2m CW Transmitter by EI9GQ
I use this simple CW transmitter for working through the RS13 satellite. Using just 10 Watts and a dipole at 3M above ground, I have made many contacts around Europe and across the Atlantic.

FM Transmitter by SMØVPO
I have had requests to add a VHF FM transmitter, to the QRP collection. This project is a simple transmitter using only one crystal and will cover 145.00 to 146.00 MHz.


2m Amplifiers

Click to enlarge 144MHz GS35 Amplifier by EA3AXV
Technical Characteristics: Ouput Power 2KW, Power Gain 13dB, Anode Voltage 4500V, Anode Current 1A, Grid Voltage 42V, Grid Current 300mA, Drive 100W, Harmonic attenuation > 55 dB.

Click to enlarge 144MHz GS35b High Power Amplifier by DL4MEA
A presentation of this amplifier and the 70cm twin was hold on the 1998 Weinheim meeting.

Click to enlarge 144 MHz low noise amplifier by OZ2OE
This amplifier is using a low cost silicon MOSFET (BF981 from Philips) to give more than 20 dB gain with around 1 dB noise figure on 2 meter. You can build more advanced low noise amplifiers using GaAs FET's,

Click to enlarge 144MHz PA with MRF317 by OZ2OE
In the good old day's? when 2 meter multimode rig's only had 10 W output I wanted something more, and the idea of building a 100 W linear amplifier was obvious.

Click to enlarge 20 Watts PA VHF Module by SV1BSX
The MHW 612 by Motorola, is a VHF Broadband power module amplifier for commercial mobile transmitters giving a maximum Output Power of about 20 Watts (50 Ohm).

2 KW Power Amplifier for 144 MHz using the GU84B tetrode by WA6PY
This amplifier is built in home-made aluminum compartment which must be electrically tight in order to avoid RF radiation.

30 Watt -20 db lineair voor de 2 meter band (FM ,CW) met de MRF237 en MRF238
Bij deze een ontwerp overgenomen uit het Motorola Engineering Bulletin. Let wel op dat deze eindtrap niet voor S.S.B of A.M. gebruik geschikt is daar de transistoren in klasse C staan !

An 8-Watt, 2-Meter “Brickette” by W7PUA
Put 20 mW into this little amplifier and get a 26-dB increase in transmitted power! Although the amplifier was designed initially for use with the DSP-10 transceiver, any 20-mW-output 2-meter exciter can enjoy the boost!

Bouw zelf een eenvoudig 2 Meter lineair voor FM en CW
Deze keer weer een transistor eindtrap voor de fanatieke "thuisprutser".
Deze eindtrap is overigens alleen voor FM, CW modus geschikt.

Bouw zelf een eenvoudig 25 watt 2 Meter lineair voor FM en CW
Deze keer weer een transistor eindtrap voor de fanatieke "thuisprutser".
Deze eindtrap is overigens alleen voor FM, CW modus geschikt.

Click to enlarge Description of a 144 MHz high power amplifier for 2 x 4CX250B by LAØBY
This page provides information on the design and practical implementation of a rather inexpensive 144 MHz high power amplifier using a pair of ceramic tetrodes, type 4CX250B, in a push-pull configuration.

Generic VHF PA by SMØVPO
These circuits are my "standard" building blocks that can be used to amplify RF power signals, from 50MHz to 170MHz, just a few component changes are required.

Click to enlarge High performance 144MHz Power amplifier by W6PO
This efficient easy-to-tune grounded-grid 8877 amplifier can be run at 2000 watts PEP ssb or 1000 watts cw.
The new Eimac 8877 is a ceramic/metal high-mu triode rated for use up to 250 Mhz.

Click to enlarge Plus de 300 Watts a tube sans bruit refroidi par convection de F6CHT
Cavité 144 refroidissement par convection de la GI7B On aperçoit le link en bérylium.
Le 4ème côté de la cavité est en fait le radiateur.

Click to enlarge Un ampli 144 avec une GS31B de F6CHT
Un Ampli 144 avec une GS31 (plus de 1500W).

Click to enlarge The FARA 2m Amplifier Project by WA1GPO
An economical, easy-to-build, 25 watt 2 meter amplifier.

Click to enlarge Zelfbouw 2-Meter Lineair voor portofoons (50 Watt)
Dit lineair is speciaal ontworpen voor 2 meter portofoons.
Veel van deze portofoons hebben een uitgangsvermogen van 1 a 1,5 Watt.

Click to enlarge Ruisarme voorversterkers voor 50 MHz tot 500 MHz met hoog IP door PAØNHC
Deze voorversterker is breedbandig door de afwezigheid van in- en uitgang bandfilters, en (in combinatie met externe band doorlaat filters) universeel toepasbaar tussen ca. 50MHz en 500MHz.


  Update: December 1 2006 Webmaster: Maarten PG1N