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جامعه رادیو اماتوری ایران

باسلام و خوشحالي فراوان راه اندازي سايت جامعه رادیو اماتوری ایران را به اطلاع علاقمندان به راديو  رسونده و برايشون سلامتي و موفقيت ارزومندم

http://www.ephamradio.com/

عكس هاي گروه راكال

مدار تطبيق امپدانس براي 20 متر

با سلام و ارزوي سلامتي

وات متر و برگشت سنج و مدار تطبیق امپدانس برای وات کم

سلام

The SWR meter is a variation of a resistive bridge. This circuit has the advantage of providing high sensitivity at low power inputs. Its disadvantage is that the maximum power that can be applied to the circuit is limited by the power dissipation of the 50-Ω bridge resistors because 75 percent of the transmit power is absorbed by these resistors under perfectly matched conditions. In this circuit, a DPDT switch adds in a 100-Ω resistor only for SWR readings, allowing the circuit to provide a reasonable SWR for your transmitter even during severe tune-up conditions. Additionally, you have minimum insertion loss in the FORWARD position because the l-kΩ bridge resistors permit you to always indicate forward relative power and calibrate the full-scale reading for SWR measurements. The antenna tuner itself is a standard T-type tuner utilizing a pair of 335-pF miniature transistor radio variable capacitors and a toroidal inductor, tapped as shown in the figure. To actually make the taps, simply wind the toroid with 40 turns of #24 wire, and then scrape the outer surface of each appropriate tum with a hobby knife to clean off the enamel insulation. Then tin each wire turn, and tack-solder tap wires to them.

Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Power_Supply_Circuit/LOW_POWER_ANTENNA_TUNER_AND_SWR_METER.html

طرح اصلاح شده مهندس عاملي

با سلام و درود فراوان بر محمد (ص)و خاندان او(ع)

فرستنده گيرنده 14 مگا

با سلام

راديوي 14 مگا كه تقريبا قطعات طرح راديو اس اس بي اقاي قنبري را بكار برده بشرح زير است:

طرح ها و كيت هاي مهندس قنبري

با سلام

200وات با ترانزيستور IRF

با سلام مطلب تقويت قدرت با حد اقل قطعات بخشي از يك كيت است كه در زير خواهد امد

ساخت خازن وارياب

با سلام

ساخت خازن وارياب براي فرستنده كه با ولتاژ بالا كار مي كند بشرح زير است:

گروه روکال

با سلام

Press Release V

Thursday morning, three years after our first contact in Iran, members of the Rockall Dx Group will be leaving Brussels at 12 o’clock local time. Flying to Teheran (via Moscow) where we have to change airport for the domestic flight to Kish Island AS-166. We have 30 fully packed suitcases filled with radio equipment and antennas. Radios will be carried as hand luggage which leaves about 6 kg of personal stuff for each operator.

We expect arrival on Kish island January 16th early morning. As soon as we have approval from the local police we can start building antennas. Priority will be lowband TX. 40m four-square and Hexbeams setting up the equipment in the shack is planned after sunset. EP6T will probably be going on air early morning of January 17th, but remember that we have not been sleeping for 36 hours at that time! Lowband RX antennas and 10m yagi will go up during the next day. We will be off air for a few hours to finish the station setup.

There will be two groups of 5 people operating in 4 hour shifts, around the clock. Again we want to ask people in Europe and Asia for your cooperation when we have propagation to North America, since this is the most difficult path on all bands. Listen to the operators instructions, and we will all be enjoying the pile ups.

There has been some deliberate QRM on 80 meters during the last months, the EP6T operators are aware of this, so turn your VFO away from the QRM and maybe you will find us calling a little bit below or above our announced frequency.

On Top Band we may be listening 1803 – 1810 for NA if EU/AS signals are causing too much trouble. Again, listen to the operators instructions.

We would like some signal reports from NA on 10 and 160m. Please send these reports via ep6t@rockall.be so we can adjust according to propagation openings. We will have daily updates from our pilots. If you want to know the best time to work us, use the link to K6TU on our website. When we have internet access you will find pictures, updates and the online log as well. Don’t forget the donate button which gives you a free QSL card for your QSO with EP.

Social media is covered by Bjorn, ON9CFG, twitter #EP6T and on Facebook.

We would like to say a big “THANK YOU” to Dr Fard, Mrs. Mortazavi and our assistants in Iran helping us getting EP6T on air, without them this expedition would not be possible.

The Rockall Dx Group