Direct conversion ssb A useable shortwave receiver for the reception of one or more amateur bands that can receive SSB, CW and possibly AM. 1 kHz 400Hz 3. from scratch to design a single-signal direct- conversion receiver. Direct Conversion receivers are the most popular QRP receivers for the reception of SSB or CW modes. Fig. 40m AM/CW/SSB Regenerative Receiver. g. My goal was to add. Wim has granted permission for us to produce it as a kit. The sections inside the dashed lines are included on the original R1 board. Detailed here within is a simple crystal controlled direct conversion phasing receiver originally developed to operate on a single fixed frequency to monitor QRSS transmissions on the 30m amateur band. K9GDT 40m CW/SSB Receiver by George! A. I had a stash of MC1496's going way back to when a I built a transceiver designed by K1BQT using the MC1496 for various modules. 80m Receiver IF=9MHz. May 27, 2020 · Also, a good commutating direct down-conversion receiver design should employ some form of antenna input isolation (e. The direct conversion (DC) receiver has seen a resurgence in use since many software defined radios use this as a front end before digitizing the signal. 3 MHz. Be a direct conversion topology. The DSP software presently demodulates SSB, CW, AM and ISB, but all that is necessary to accommodate any other mode is new software. 80m Two CW/SSB Superheterodyne Receivers. So I was off and running. (I have used these tubes for many homebrew inductors. Contained in the rig was some very clever circuitry with a 5. The QRPGuys Lidia 40m Direct Conversion Receiver is the creation of SP5DDJ and he has dedicated it to the memory of his wife Lidia. 2. Utilize a Direct Digital Synthesizer (DDS) for frequency control. i1 RECEIVER DIRECT-CONVERSION RECEIVER FOR 80 METRES What better occasion to present an ultra- simple 80 m receiver than this month"s issue devoted to amateur radio and TV? An ideal project for the holidays, this CW/RTTY/SSB receiver is inexpensive, yet has good sensitivity and selectivity. from RF to baseband. It is a sensitive direct conversion receiver kit that covers the 40m band for cw or ssb reception. It is based on the R2 Receiver and T2 Transmitter by KK7B that are described in the 2009 ARRL handbook. , a pre-amplifier or buffer) for the following two main reasons: 1. ABOUT DIRECT CONVERSION RECEIVERS: The HR40 is a “Direct Conversion” receiving circuit. 10. You will have it ready in no time, and it only requires headphones, a set of bat- teries and a long I Fig 2-Block diagram of the R2 single-signal direct-conversion receiver. It’s so easy, you’ve got to try it! Figure 2—At A, simulated and measured frequency response for SSB. 55 MHz four pole crystal Filter and a VFO that tuned in the 1. Filter 10. 20m Direct Conversion Receiver - W1VD. Apr 19, 2021 · This makes SSB direct conversion receivers relatively straightforward. 144 MHz Superregenerative Receiver Here is another circuit design from Cliff Donley, (K8TND) he calls “Lucky Strike”. Please be aware that this is not presented as a step-by-step construction project; rather, it is presented as a description of a work-in-progress. Mar 5, 2025 · Brian KI7LKB has built a very FB SolderSmoke direct conversion receiver. Added are an RF splitter, second mixer diplexer and low-noise preamp, an audio phase-shift network and a summer. 5W 8 Ω First Mixer SBL-1 Low Noise Post Mixer Amplifier 2. The availability of IC's, improves their performance, and reduces parts count, making them simple to build, and easy to use. Here I start with a binaural direct conversion recever and then add parts to allow single signal reception as a phasing receiver. 8 to 4 MHz and 7. 3. Note the steep skirts. A direct-conversion SSB receiver achieves most of its gain in a simple audio-frequency amplifier, while the selectivity is achieved by simple RC lowpass filters. Amplifier 7-7. I personally have built many of the projects in SSDRA; but never that one. 2 - Direct-conversion SSB transceiver design. 144 MHz All-FET Direct Conversion Receiver. ARRL - Home ARRL - Home Jul 17, 2020 · Direct Conversion. Amplifier AGC 400Hz-6db Pad Post I. •SSB (image reject) direct conversion blocks •Audio band limiting filter is key to setting selectivity •Phase difference networks are obtained from a pair of Feb 23, 2025 · Aaron ZL1AUN used his homebrew SolderSmoke Direct Conversion receiver in a 40 meter SSB contact with his fellow New Zealand radio amateurs. Oct 31, 2018 · A homebrew 5 Watt SSB/CW transceiver using the phasing method. 80m SSB/CW/AM Superheterodyne Receiver. A local oscillator is mixed with the frequency one wants to receive and the product of this mix is the sum of the two sidebands around this frequency. A DCR translates the band of interest directly to zero frequency and employs low-pass filtering to suppress nearby interferers, as shown in Fig. 400Hz Filter Product Detector MC1496 Tuneable AF Notch 400-3000 Hz Switched Capacitor L. P. 144 MHz SSB/CW Direct Conversion Receiver. Report comment. You can think of a DC The QRPGuys Lidia 40m Direct Conversion Receiver is the creation of SP5DDJ and he has dedicated it to the memory of his wife Lidia. It had two 6HF5's for the finals and had a 300 Watt input. Describing a simple binaural receiver. His transmitter was a modern commercial rig, but his receiver was the Direct Conversion receiver. Direct conversion, also called zero-IF or homodyne con-version, is the natural approach to downconverting a signal Fig. There is no need for IF (intermediate frequency) circuitry. 3 MHz 3. Current state-of-the-art commodity DDS ICs—such as the 300-MHz AD9852 Single- and AD9854 Quadrature Complete-DDS chips—offer usable outputs to the lower VHF spectrum Lidia 40 project Direct conversion receiver CW/SSB for 40m band by SP5DDJ When Lidia 80 was completed and fully tested I decided like during previous projects Aquarius, Taurus and Libra try to run on other bands. The filter shape factor is Single band HF SSB / CW direct conversion phasing receiver . We are offering it on 40m, but it can be configured to work on other bands. Direct-conversion architecture. Meet FCC requirements for spectral purity of emissions. 9. Binaural direct conversion receiver. Jul 31, 2020 · To build a direct conversion receiver, all we need to do is connect the mixer’s main input to an antenna as connect its secondary input to a signal generator of some sort for tuning. Follow this up with a low pass filter and an audio amplifier and you should have a fully working radio. Drone says: (Direct Conversion Quadrature Synchronous Detector), there are others. Note that the effect is not audible in the video as the audio is only mono. The filter shape factor is Direct Conversion HF Transceiver with DDS by OH2NLT & OH7SV JUMA-TRX1 is a direct conversion HF transceiver based on the previous JUMA-RX1, JUMA-TX1, JUMA-KEYER1 projects. Firstly, I looked at the Motorola Data sheets and thought why not try my hand at building a Direct Conversion Receiver. Direct conversion means that you process the incoming RF signal at its frequency without down converting it to an IF (Intermediate Frequency) and then processing the IF frequency. This was a $160 radio (1960's) that worked 80 and 40 Meter SSB over two ranges: 3. 395 QRPGuys Lidia 40m Direct Conversion Receiver – $35. The block diagram of this system is shown below: The most popular seems to be the direct-conversion SSB transceiver design shown on Fig. F. A maximum of four active components can be used, inclusive the low frequency amplifier. He made the PTO coil form himself, using the cardboard from a coat hanger as the tube. I built this radio when I got back on the air after a break away from the hobby. The quadra- Direct digital syntheses (DDS) technology is advancing rapidly, but direct synthesis of UHF and microwave output frequencies is not yet practical or economically feasible. Of course you also receive anything in the opposite sideband out to the limit of your audio bandwidth, and anything that sneaks through as distortion before or after. 6 MHz range. Th e receiver “processes” the incoming signal right at its own frequency, with no need to mix or transform it with additional internal oscillators and amplifiers running at intermediate Jan 27, 2014 · The main part of a direct conversion receiver is a single mixer stage. It is driven by a stable DDS VFO. We are offering it on 40m, but the main IC is rated to 60mHz so it may be configured to work on other HF bands. Feb 6, 2018 · In fact, you can receive SSB voice with a direct conversion (ie, product detector) receiver. Hence a direct conversion receiver can be used to receive CW, LSB, USB, DSB and AM signals with very simple means. 1 to 7. There are only three hardware connection points needed. Reply. It is a through hole kit that uses the popular NE602/612 mixer/oscillator and an LM386 audio amplifier for ear buds or a small speaker. 395 MHz 8 pole Crystal Filters 500Hz Filter Gain EQ MC1350 I. ayyx hosfk szbmu sdgpaw asufc myqbad iyti qqumi hub xxgx lnkin zzzj fedm ssxsamhp odnowo