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HF CW. The Oner HF CW transmitter was first described by George, GM3OXX in Sprat number 45 and has been widely used as a simple but effective, tiny transmitter.


It is so called because it can be built on a PCB just one inch square! A kit is available for the transmitter and other modules of the same size, including a simple receiver from Kanga Products, making a useful and very compact transceiver for HF use. The 3.3k resistor (*), should be chosen for the required RF output, but choose with care, as the PA can be blown if excess drive is given. QUARTZ. FT243 crystals have pins spaced 1/2 inch apart, and are used in MANY ham radios made from the 1940s through 1970s.


They are also used in countless military sets such as the BC-611 and GRC-109 etc. Note- some of these are original FT243 crystals, some are reworked surplus units with wire lead crystals inside as described in tube transmitter articles using them in CQ Magazine and detailed technical analysis in Electric Radio Magazine. CLICK "VIEW CART" YELLOW BUTTON IN ORDER TO CHECK OUT AND PAY with VISA, MASTERCARD, PAYPAL, American Express etc. !!

The price for one to four crystal on a given frequency is $49.00 each plus shipping. VN10KM. J h.


2N2222 TX. LED capa. Code. Ca fait un petit moment que je pensais écrire une suite à l’article de vulgarisation autour de la platine Arduino que j’avais fait pour Radioamateur Magazine.


Je ne présente plus le concept Arduino si ce n’est en disant que c’est une plateforme complète (matériel, IDE, librairies…) qui permet de développer simplement et rapidement des circuit autour de micro-contrôleurs Atmel MegaAVR. Je voulais montrer une application simple de l’usage d’un micro-contrôlleur dans le cadre d’une activité radioamateur. Sans partir dans l’accès à des circuits externes comme un écran LCD qui tout en restant simple alourdissent le code et limite la compréhension pour le débutant, il restait peu de possibilités pratiques : un manipulateur Iambic ou une balise CW. Finalement c’est sur le deuxième projet que je me suis reporté sur le deuxième car j’avais un besoin propre pour des essais de propagation sur 80m et 40m que je veux faire en automne.

Autres articles sur le même sujet: Tracker. Arduino Pro Micro. Sku: DEV-10999 Here at SparkFun, we refuse to leave 'good enough' alone.

Arduino Pro Micro

That's why we're adding to our line-up of Arduino-compatible microcontrollers once more! The Pro Micro is similar to the Pro Mini except with an ATmega32U4 on board. The USB transceiver inside the 32U4 allows us to add USB connectivity on-board and do away with bulky external USB interface. This tiny little board does all of the neat-o Arduino tricks that you're familiar with: 4 channels of 10-bit ADC, 5 PWM pins, 12 DIOs as well as hardware serial connections Rx and Tx.

This is the 3.3V version so, as always, keep in mind the limits of system voltage and so forth. Polymer Lithium Ion Battery. These are very slim, extremely light weight batteries based on the new Polymer Lithium Ion chemistry.

Polymer Lithium Ion Battery

This is the highest energy density currently in production. Résine. WSPR 30m. Code. AD9851 DDS. Been playing with the AD9851 DDS for a while now using other people's software mostly written in assembly language that I find rather hard to get my head around.

AD9851 DDS

Finally tonight, with the help of severalothers who have published their work on the internet I have got some simple code to drive this chip the way I want. This can tell it the frequency the generate in Hz and it just works. This minimal example does a small sweep from 10Mhz so it's easy to listen to on a radio. While I prefer to use the atmel chips "naked" I do find the Arduino board a very convenient way to muck around and get things going in an interactive environment. Micro GPS Module.

Micro GPS Module for Arduino PIC AVR With Breakout BoardSerial Output NMEA - 0183 Micro GPS Module - only 16X16X6 mm Brand new stock - not redundant or obsolete.Volume supply possible - please send us a message The Micro GPS Module has the following features.

Micro GPS Module

Note that it has an onboard antenna - no need to connect a separate antenna. The breakout board allows easy access to all the module's pins, and you only have to solder the small pitch module connecions ONCE to attach to the breakout board. The board additionally features the connections (with components included) to make a simple zener regulator for supplying the required voltage (3.3V) to the Vbackup pin if you are powering the module from 5V. If you are powering the module from 3.3V, you can simply connect Vbackup to Vcc.

Arduino GPS clock. Code. Slowduino - So, a bunch of the ATMega AVRs have the ability to work on very low voltage (down to 1.8V) and also, to require extremely low current – less than 1mA!

Slowduino -

This is 1/10th of what the typical Arduino setup uses, so, for extremely low power applications (such as a super-minimalistic solar setup), it’s worth considering. But of course, there is a catch. Current is a function of both Vcc voltage and clock rate. The lower the active current, the slower you have to go – but as a side benefit you can also lower the voltage: Radioamateur. FT 897. FT-8x7 CAT.