Vk3ye agc
Vk3ye agc. i assume its just to tweek the volume to a reasonable level. It contains: - 200hz CW Filter - Mic Preamp (SMM2167 Module) - VK3YE LED AGC - LPF section (Dual relay per filter) I will try do it all TH, but the 100uh inductors underneath will need to be 1206 SMT Audio AGC for the Bitx - Part 3 (signal strength meter) How good a Bitx can receive at an RF quiet location. These videos document my experiments with this interesting receiver configuration. Thanks Chris. These frequencies are 600 kHz apart for two metre repeaters and 5 MHz apart for repeaters operating on 70 centimetres. 99 things you can do with Amateur Radio. 4. alphalink. It contains: - 200hz CW Filter - Mic Preamp (SMM2167 Module) - VK3YE LED AGC - LPF section (Dual relay per filter) I will try do it all TH, but the 100uh inductors underneath will need to be 1206 SMT On Fri, Mar 29, 2019 at 12:19 PM, Nick VK4PP wrote: HI Everyone. You could just leave the pot in there. Titled "The Simple SDR: a basic software defined radio anyone can build" by Peter Parker VK3YE. Simply explained - do not disconnect any wires or parts in the uBITX. huw@> wrote: is there anyone out there that can help. I was curious if things had improved. The wiper of the pot goes to the diode, the two ends of the pot go to the 0. Build a hanging dipole for 2 metres. When I added a Hi-Per-Mite CW filter (see earlier posts), it increased the need for an AGC. My build of Peter VK3YE 's LED-LDR AGC circuit. Jun 16, 2019 · Curt WB8YYY has been pleased with the somewhat unusual VK3YE AGC circuit, that uses a LDR and LED pair, as it nicely removes the top of large signals. On Fri, Mar 29, 2019 at 12:19 PM, Nick VK4PP wrote: HI Everyone. One of the most popular homebrew designs, version of it are in use around the world. A switch also allows operation as a single L-match for unbalanced antennas like end-fed wires. Supports simple circuit simulation. I started with this resistor being 3. I did make it a bit smaller, but only by standing the resistors and diode on-end. They have, but the passband is still much too Jan 31, 2018 · Nick found the VK3YE solution messed with the audio quality, made it all scratchy, and still didnt handle local 100w stations well … Now after playing with the TPA for a few days he is very happy with the results. ) Connect the AGC boards output to the C21 - pad on the QCX board and it should work. Minimum QRP. Jun 17, 2023 · Australia. Apart from their small size, other loop advantages include relatively easy construction and the ability to cover several bands. Nov 23, 2017 · A list of excellent Bitx40 modifications to improve this great little HF transceiver kit. Audio has good depth and AGC is reponsive, also gives a nice increase in gain. 3K. Ham Member Lookups: 41828. Reference Now, I haven't tried many AGC solution on the uBITX, only 2, the VK3YE, and ADAFRUIT TPA2016 I2C module. The WB8YYY/VK3YE design (see Files and YouTube) ingeniously uses a bright LED to activate a photoresistor (or Light Detecting Resistor - LDR) that reduces volume on peaks. Paul VK3HN. The uBitx (aka Micro Bitx) is a low cost easily built HF transceiver designed by Ashar Farhan VU2ESE. We can each manage our degree of addiction in modifying this nice rig. I've been doing a bit more t'inking, including my earlier suggestion of RF AGC (same idea, but different details). The 2N7000 and the drain resistor together form a volume Quite similar to Farhan's circuit, primary difference is the use of an LED and LDR instead of a FET: You don't want to ask me how best to implement AGC, as I have not built one. 47K subscribers. All wire antennas described above have been for portable operating. I don't miss agc much sitting on a frequency, but in tuning its nice. The magnetic loop is an ideal HF antenna for units, flats or apartments where only a small courtyard or balcony is available. Email: Login required to view. i would like the wiring diagram for the agc "idiots guide for non technical muppet" and pictures. Oct 29, 2019 · The AGC is apparently very effective at calming those 9+20dB signals that on the uBITx will damage your hearing! The design is for the BITx40, but can be readily adapted for the uBITx – probably not at the antenna (because it is best to avoid diodes at the front end of the uBITx), but at the 45MHz IF stage. 73 Curt PS - I do have a hybrid cascode but I am thinking to use it in a homebrew Rx -- not sure I wish to 'break' one of the bidirectional amplifiers here. In this circuit JFET Q2 acts as variable RESISTOR. All Messages By This Member; MVS Sarma The AGC 'sense' into the series (nominal) 10 uF capacitor is fed from the center of the volume control, via a series resistor. I’d had a v3 some years ago and it presented quite a few challenges. Jun 22, 2019 · VK3YE has suggested measuring current in parallel with the LED that drives the AGC action, but he found this gave little indication of relative signal strength. In fact, it works much better measuring current in series with the LED. Easy to use and quick to get started. A sudden loud signal can be pretty annoying, especially when peaked by the filter. Aug 3, 2018 · Nick VK4PLN admits he has tried just two AGC approaches on BITx rigs: the VK3YE AGC (which is shall we say very illuminating) and the ADAFRUIT TPA2016 I2C module. by Peter Parker VK3YE - first appeared in April 1996 Amateur Radio magazine. Mar 28, 2019 · VK4PP Ultimate uBitx Daughter Board. #ubitx #filters #parts amateurs – Drew, VK3XU and Peter, VK3YE – have been prolific in their writings on practical amateur radio. With the help of a couple ops here I figured out my wrong integration of this circuit into the uBITX. privacy policy. htm Without the LED on it shows 24Meg, with the LED fully driven at 15ma it shows 95 ohms. The VK3YE solution I found messed with the audio quality, made it all scratchy, and still didnt handle local 100w stations well Now after playing with the TPA for a few days I am very happy with the results. Dec 21, 2021 · LED/LDR audio limiter in uBitxA common problem with many kit rigs, such as the QCX and uBitx, is that they have no AGC. The project is a Simple SDR (software defined radio), which was published in the WIA's magazine "Amateur Radio", volume 79, issues 9 & 10 2011. Note that it was for 14 MHz, designed to allow Indian hams their first taste of DX. Thanks Chris for the reply. Experiments with regenerative and TRF receivers. I think I will build it and try it out on my V6. 160 & 80m coax loop antenna and coupler. I'm working on a nice little add-on board for the uBitx. Roll up coax cable 40 - 20 metre magnetic loop. Repeaters use two frequencies; an input (or receive) frequency and an output (or transmit) frequency. Because it's an active device the receiver has higher gain than those with passive mixers such as the 'Beach 40'. I think this would work very well with VK3YE's AGC circuit. Hi Richard. Here is the circuit : The Audio-In from the original volume control comes into the circuit on the left and the Audio Out is sent to the volume control's hot end. Electronics on the Floor: Automatic Gain Control with LED and LDR This is an improved audio AGC. More. Should I modify the original VK3YE AGC circuit in order to use it with the V6 UBITX? According to Your experience, which is the best connection for the AUDIO INPUT and the AUDIO OUTPUT of the VK3YE AGC? Videos about electronics and amateur radio from the shack of VK3YE. It is similar to other NE602-based DSB rigs by M0DAD Chris, thank you, I put in a voltage divider as shown on your drawing and it seems to be working. au/~parkerp/projects/projknobless. So here it is, it just fits all around the volume control. I was trying to use it is series with the volume control, it needs to go in parallel. Here's the original circuit that started it all. htm Report to Moderators I think this message isn't appropriate for our group. The ubitx receives wonderfully and I am testing on 40m. . Different from the rest, this versatile coupler contains two L-matches and a balun. How about this: Tap off the output of Q1 (RF Amp) to drive the first BC548 (caps in and out small ceramics, maybe a darlington or extra stage if more 'loop gain' needed?). Apr 26, 2017 · VK3YE's 'non-invasive' AGC circuit for BiTx40 or similar QRP rigs. When a strong signal is encountered, it can be hard on the ears. VK3YE AGC Success in uBITX. A longing to build a small transmitter, receiver or piece of test equipment is commonly expressed by many amateurs. Soldering some connectors and wires is required. For a repeater to transmit, it needs to be activated by a sufficiently strong signal on its input frequency. I also could not get the VK3YE AGC to work either. I emailed Peter (VK3YE) and he gave me great response, but I wouldn't complain if I get more help. Joel N6ALT Report to Moderators I think this message isn't appropriate for our group. I used 33k - 33k as resistor values. Make your Passion Pay. The output of OP-amp is fed to Q1. I recall those photo OC71's real PITA if the paint got scratched by mistake. It has some elements of the hybrid cascode IF AGC. He’s a really smart man who lives in India. Mar 29, 2019 · Nick VK4PP is working on a nice little add-on board for the µBitx with the following mods incorporated: 200hz CW Filter Mic Preamp (SMM2167 Module) VK3YE LED AGC LPF section (Dual relay per filter) POP fix for earlier v3 boards, and High Pass Filter on RX for BCI option. I recently put together a uBitx v6 as a winter project. However, I decided rather than an actual AGC, what was needed was a simpler audio limiter/AVC. Jan 31, 2018 · Nick found the VK3YE solution messed with the audio quality, made it all scratchy, and still didnt handle local 100w stations well … Now after playing with the TPA for a few days he is very happy with the results. Some are described on my website at: http://home. Just my take though as I have not tested it. Single signal reception on a regenerative receiver. It got the audio up again. If what you want is to reduce how aggressive the AGC is, I suggest replacing that 100k resistor to the left of the diode with a 100k pot. Aug 15, 2019 · Add S-meter to VK3YE Audio AGC Curt WB8YYY has been pleased with the somewhat unusual VK3YE AGC circuit, that uses a LDR and LED pair, as it nicely removes the top of large signals. Jan 30, 2018 · The VK3YE solution I found messed with the audio quality, made it all scratchy, and still didnt handle local 100w stations well Now after playing with the TPA for a few days I am very happy with the results. Peter Parker VK3YE 1997 - 2020. Nick found the VK3YE solution messed with the audio quality, made it all scratchy, and still didnt handle local 100w stations well … Aug 6, 2017 · Not sure when but Philips (head quartered Netherlands) bought Mullard. Thank you for your assistance. The WB8YYY/VK3YE design (see Files and YouTube Jan 28, 2017 · The BITX40v3 is a digitally controlled 40 Meter HF SSB (Single SideBand) transceiver designed mostly by Ashar Farhan. But wire antennas can also be used on the move if supported by a pole. Five really compromised portable magnetic loops. The editor of AR and Peter VK3YE have kindly given me permission to publish the original circuit diagrams Dec 18, 2021 · LED/LDR AGC mod for uBitx V6. 3. This is a common way using one JFET transistor. for Audio AGC uses 1 OP-amp and 2 transistors, 1 JFET + 1 bipolar. A single NE602 forms both the transmitter's balanced modulator and the receiver's product detector. Nov 1, 2020 · We would like to show you a description here but the site won’t allow us. It would take relatively more LED (less LDR Resistance) current to lower the volume because you lowered the 3. I can steadily bleed the voltage off of the LED and the resistance changes at a smooth linear rate. It was a toss-up Philips or Mullard. Nick VK4PP #54786 . Tips and Tricks for the uBitx multiband SSB transceiver. Dec 1, 2016 · Part 2 of an automatic audio gain control. Login is required for additional detail. Connect the input to the AGC circuit to the C21 + pad on the QCX board (put C21 on the AGC circuit board as the input capacitor. 1uF cap and to ground (where the 100k resistor was). They will also work well indoors. I agree, SMD is do-able, I have the Kees AGC, but TH is easier on the eyes and less tiring, I also just like the look of TH components too. Those adding the jackal get something even better, Jack invited me to look at it a while back. and R2 120k and this JFET acts as a voltage divider. It's an ingeniously designed multiband HF CW/SSB transceiver built on a circuit board approximately 15 x 15 cm. 2. I have swapped the lefthand 10k pre-set for a pot, so can have adjustable AGC on the front panel of the Bitx, thats assuming I ever get to finish playing and box it up. Both were top of the list both for transistors and valves UK/Europe (pre-EU of course). The website has been updated. Jul 31, 2018 · Nick VK4PLN already has a collection of boards available (at or near cost) for the µBITx. The BITX40v3 being discussed here is a “short kit” which includes almost everything needed to complete a radio and get on the air. Tips and Tricks for the Bitx SSB transceiver. 3k but noticed the AGC behavior varied with the volume control setting - which implies this circuit is loading the main path. i haven't fitted the audio 10k trim pot i will need to shop around or hunt in the depths of a junk box for that part. The antenna described is a compromise, built Jan 31, 2018 · Nick found the VK3YE solution messed with the audio quality, made it all scratchy, and still didnt handle local 100w stations well … Now after playing with the TPA for a few days he is very happy with the results. Jun 16, 2019 · Add S-meter to VK3YE Audio AGC Curt WB8YYY has been pleased with the somewhat unusual VK3YE AGC circuit, that uses a LDR and LED pair, as it nicely removes the top of large signals. For students, teachers, creators Jan 31, 2018 · Nick found the VK3YE solution messed with the audio quality, made it all scratchy, and still didnt handle local 100w stations well … Now after playing with the TPA for a few days he is very happy with the results. The Bitx is a low cost easily built SSB transceiver designed by Ashar Farhan VU2ESE. In a series of YouTube videos he demonstrates and then walks through the design of a simple double side band transmit, direct conversion receive, transceiver he calls the "Beach 40". This input signal is amplified by OP-amp. The 'Micro 40' is a simple DSB voice transceiver for the 7 MHz amateur band. Nick found the VK3YE solution messed with the audio quality, made it all scratchy, and still didnt handle local 100w stations well … Jun 5, 2017 · The AGC board produces an audio AGC control signal. Phil - G7BZD toggle quoted message Show quoted text Apr 16, 2018 · Nick VK4PLN admits he has tried just two AGC approaches on BITx rigs: the VK3YE AGC (which is shall we say very illuminating) and the ADAFRUIT TPA2016 I2C module. The Group moderators are responsible for maintaining their community and can address these issues. Instead the SSB signal is generated and received directly on the . and where to fit it in the bitx40. Nov 13, 2016 · AGC for the BITX. Getting back into Amateur Radio. You lift the AGC pin on the MC1350p and connect the audio AGC control and you have AGC for the X1M. au/~parkerp/project. so here it is Phil one board nearly finished. Second BC548 then drives another to reduce Q1's power from About the Knobless Wonder single channel 7 MHz SSB transceiver described at http://home. Jun 15, 2019 · VK3YE AGC; a mike compressor; the standalone analyser from KD8CEC; two 5V rails (one for TX and one for RX) and; a Li-Ion battery with protection bar; Olivier asks for forgiveness for the anarchic wiring because his rig is still under construction. some of us may be applying a VU meter that was shipped with a front panel from Amateur Radio kits India. Unlike other filter type SSB rigs there are no RF mixers, VFOs or intermediate frequencies. Nick VK4PLN already has a collection of boards available (at or near cost) for the µBITx. Many BITXers have longed for a simple AGC circuit. Just got your ham licence? Or getting back on air after a break? Watch these to get up to speed with what the amateur bands offer and how to make contacts. Operation. VK3YE AGC Board - EasyEDA open source hardware lab Audio AGC amplifier circuit under Audio Amplifier Circuits -59558- : Next. I have to connect the VK3YE AGC to the UBITX V6. i have read that lots of people have done this with great success but unable to find instructions or pictures just the you tube link. I think I've still got an OC44 or 45 in the junk-box, and one of the newer-fangled AC128s. On 27-02-2017 10:05, Allard PE1NWL wrote: I followed KV4QB´s advice and put a 10uF between 1 and 8 on the LM386. The AGC is somewhat working, but strong Nov 27, 2016 · 73, Peter VK3YE. Homebrewing for the Novice. No the opposite. 8. All too often, however, the longing remains merely that, due to perceived difficulties in obtaining components, a lack of Dec 4, 2012 · Peter, VK3YE, is an inspirational home brew designer and constructor. Includes heavy types for home use and lighter versions for pedestrian mobile. My question was how to integrate this AGC circuit on the BITX40 board. The band here is not great so no powerful stations to attenuate yet, but it seems to be working. It taps audio off earlier in the circuit and This is no hardship on bands like 7 MHz where ceramic resonators exist for the amateur bands and can be pulled down in frequency to cover a substantial and useful portion of the band. The 'Knobless Wonder' is a simple fixed frequency SSB voice transceiver for the 7 MHz amateur band. For many years Drew and Peter have produced straight Conclusion. This one uses an audio preamp to allow the control to be driven from an earlier audio stage, independent of the v Dec 13, 2005 · This project idea below. Couple into tall poles with a Rowland Ring. This arrangement allows efficient matching of balanced tuned feeder dipoles. Illustrated International Ham Radio Dictionary. any help would be brilliant. He is currently working on a new board design for the VK3YE AGC. VK3YE AGC pcb. Jul 27, 2018 · New board from Nick VK4PLN coming: VK3YE AGC design. 8K views 6 years ago. gr Junger Audio B46 Level Magic AES Digital Audio Broadcast Processor AGC – ProStudioConnection LLC Jun 24, 2019 · Add S-meter to VK3YE Audio AGC Curt WB8YYY has been pleased with the somewhat unusual VK3YE AGC circuit, that uses a LDR and LED pair, as it nicely removes the top of large signals. Peter Parker VK3YE. Anyway after several hours of pondering over the strip board built non working AGC, I had a call from Wife can I take fresh towels down to the beach for the Grad kids. Audio has good depth and AGC is responsive, and the unit also gives a nice increase in gain. Thought I would add the VK3YE AGC. Nick found the VK3YE solution messed with the audio quality, made it all scratchy, and still didnt handle local 100w stations well … Dec 8, 2020 · Time stamps:00:00 - 00:32 Introduction, technical overview01:55 - 02:32 AGC turning OFF/ON04:25 - 05:05 The first QSO in MWC contest06:06 - 07:06 The second Describing and demonstrating various magnetic loop antennas. VK3YE has suggested measuring current in parallel with the LED that drives the AGC action, but he found this gave little indication of relative signal strength. The process supports design scales of 300 devices or 1000 pads. QSL: No QSLs please. Glad I figured out finally the vk3ye agc, its nice enough. Unfortunately the Bitx has no vairable gain IF stage to which an audio AGC signal could be applied so it will not work with the Bitx (without a lot of redesign work and modification). 1. Something I'm Working on 73 Nick VK4PLN. My first version. A balanced antenna coupler and multiband tuned feeder dipole. com. The first draft of the board layout can be seen below – laid out for through hole components: Reference 134p14 – The AGC 80-40 Regenerative receiver (Phil Storr VK5RP) RF AMPLIFIERS TECHNICAL TIPS 145p18 – Things you can do with 20m of wire (Peter Parker VK3YE) 143p12 – Recycling 18650 Laptop Batteries (Alex Berkuta VK2BE) 141p17 – Oscillator Tips {Chris Pitcher VK5YCP} 140p16 – Quartz crystal sanding (Peter Parker VK3YE) Feb 1, 2017 · If what you want is to reduce how aggressive the AGC is, I suggest replacing that 100k resistor to the left of the diode with a 100k pot. It's closely related to its predecessor, the 7 MHz only Bitx. Subscribed. my goal is just to AGC the very largest signals. Curt WB8YYY has been pleased with the somewhat unusual VK3YE AGC circuit, that uses a LDR and LED pair, as it nicely removes the top of large signals. 5 metre long wire antenna for 7 - 50 MHz pedestrian mobile. Report to Moderators I think this message isn't appropriate for our group. 121. Lots of different ways to do it. Some simple portable antennas for 10 & 6 metres. The first draft of the board layout can be seen below – laid out for through hole components: Jun 10, 2019 · Glad I figured out finally the vk3ye agc, its nice enough. Reference Aug 3, 2018 · Nick VK4PLN admits he has tried just two AGC approaches on BITx rigs: the VK3YE AGC (which is shall we say very illuminating) and the ADAFRUIT TPA2016 I2C module. Sep 7, 2017 · Remove C21 from the QCX. Jun 16, 2019 · Add S-meter to VK3YE Audio AGC. Please click the button to reload the page. A wire length of 5 metres forms a quarter wavelength on 14 MHz and a half wavelength on 28 MHz. I am thinking it may be around 250 uA but I am not sure -- I am also seeking the resistance of the movement as I may need to employ a current shunt. Super simple 2m & 70cm antennas for FM, SSB & digital modes. Videos about electronics and amateur radio from the shack of VK3YE. It is basically the IF and audio end of a BitX (featured elsewhere on this page). On Mon, Jun 12, 2017 at 5:45 PM, M0LHT <m0lht. ng xm wr ni ne tm pc vc kd qc