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In the transmitter section: Not very nice if you want to achieve a comparable amount of gain on all the bands the transceiver is going to cover.

(PDF) 2SC1307 Datasheet download

I first chose the AD by Analog Devices. Transmitter board Switch board with final low pass filters centered between the two others Receiver board All boards are connected from the laterals by a homemade plug system so that the single Verobaords can be removed and reinstalled into and from the assembly quickly. So, after some days of conceiving, I finally had the basic concept in mind.

This means on 80 and 40 meters you can expect tremendous gain. I read a lot of stuff in advance, particularly the ARRL library, to get aquainted with the basics of designing linear broadband amplifiers for rf.

The main thing that makes a multiband transceiver much more complex than a monobander is the neccessity to switch frequency related filters in certain parts of the circuit even if broadband designs are widely applied. VFO and LO frequency considerations In this transceiver the interfrequency IF is 10 MHz which is based on the fact that respective crystals can cheaply be purchased in larger quantities to build appropriate ladder filters with.

2ac1307 the other hand I had kept in mind that a broadband design always offers significantly lower overall gain than a monoband amplifier. Mechanical considerations I love to build rigs that are compact and neat.


Must be able to deal with high signal levels on the lower ham bands.

An audio preamp and the LM as the power amp do the final job of amplifiing of the audio signal together to loudspeaker level. Again this is to avoid the repeated soldering process ruining my Veroboards: You can run endless tests without being endangered to seriously damage the solder pads of your Veroboard!

The signals were bad, distortion was a severe problem. But some experiments were neccessary to optimize the VFO circuit.

December – Peter Rachow’s (DK7IH) Amateur Radio Engineering Projects

Also keep harmonics in mind! Each relay gets about 4 volts of coil voltage then drawing about 40 mA which is more than enough because my OMRON relays start reliable switching from a coil voltage of about 3. And kick the a…. I had located the data sheets for both but was too lazy and too much of a technical ninny to actually do an intense side-by-side comparison.

That, in general, is not a big problem at all, if you know how these devices look like. Datqsheet DDS produces spurii that can be received with more or less intense signal strength in your own receiver. I had two cases of faked semiconductors the recent year. And, oh yes, kudos to board maker who, in his wisdom, provided both TO and TO holes for the Q7 final.

2SC Datasheet PDF – NEC => Renesas Technology

Class AB amplifiers have got a relatively low standing current bias and therefore a higher degree of efficiency than class A. You may ask why I used 2 push-pull stages. Emitter bypassing The bypass capacitors lets ac flow unresitedly over the paralleled resistor.

Band switch drivers The drivers for each band that drive 3 datasheef switched relays per band are controlled by one seperate port of the controller Ports PE3 to PE7. The transmitter I have to admit, I underestimated the diffculties that I was going to face when constructing a 3 datasheey 30 MHz broadband QRP amplifier with a power output level of about 10 watts on all the five bands covered.


Next check the price. In high color mode on the other hand each pixel contains 2 bytes of data which makes data transfer a bit slower. Regards Ollie k0lqk toggle quoted message. One delivers increasing voltage when 2sc107 strength is rising, the other datasjeet voltage under the same condition.

Check the data sheet for exact data before buying a certain relay model.

RF Power Transistor

The audio-derived AGC circuit is the same like in my hand-held transceiver. The drivers for each band that drive 3 series switched relays per band are controlled by one seperate port of the controller Ports PE3 to PE7. For the upper three bands 20, 15 and 10 meters another equation is used:. To learn more about multi band QRP transceivers I also browsed the web for similar projects. All lines are connected by the side-plugs. Sorry for being lazy and do appreciate any response on this subject.

Due to the fact that they are operated in class AB-mode I wanted to keep linearity as high as possible. And also keep in mind that the image frequency on every band should not fall into shortwave broadcast bands e. The upper part where the device is mounted to the heatsink does not look the same. The same is true for the emitters bypasses: First, to increase output voltage, I used a symmetric output with a trifilar wound transformer.