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Hi all Apologies if this isn't the correct forum... I have a CDG2000 transceiver "kit" for sale. (The CDG2000 was a very high performance transceiver documented in RadCom a number of years ago. It featured H-mode mixers and a receive chain that challenged the best of commercial receivers performance). I am selling a set of printed circuit boards, screening boxes and the majority of components (pretty much all of the components needed to build the transceiver, but including all of the hard to find components. You need to add a VFO & display). All documentation will be included. ?100 plus postage & packing. 73 Adrian M1LCR

Hello Andy and the group, Could anyone sell me the KIT for the 20W PA or just the PCB ? I could even consider a fully mounted PA, but I would rather get it it new, not used. Thank you for reading me. Have a Merry Christmas and a Happy New Year 2019 ! Best Regards, Alain F4HFS

hi, i m interessed to buy a UBITX multibands, for used and testing in next dxpedition. any proposals please via email iz8ccw@... 73 Ant

Im looking for: Raduino V-1.01 , startup firmware. I can not find

Hi there, I'm planning a scratch-build (own parts, own boards) of the Mk II transceiver for 40 and 20m. I have some questions: The Mk II instruction manual refers to T1, an FT50-43 impedance matching transformer on the output of the xtal IF filter, but this is missing from the MkII exciter circuit diagram. I assume T1 was replaced by the 200 ohm resistor between Cs and the 10nF on pin 4 of the MC1350P. I plan to use a 9MHz 6-pole crystal filter for SSB, around 2.4kHz . I found references in this group to CP1-5 (initially 68pF, then 100pF). This range seems typical for such a filter. I have run up Dishal but the filter topology it assumes for 6 crystals is not a straight ladder, it is an asymmetrical arrangement with a central C. I'll start with 100pFs and see how it sounds. There are three capacitors in series with the crystal filter, Cs, for which I cannot find a value. I plan to heatsink the two RD16HHF1 PA FETs against the aluminium case. No insulation kits required as the devices tab is its source. Does the RD16HHF1 driver need heatsinking? If so, can it be bolted to a small finned heatsink on the board, or does it need to be mounted flat against the aluminium case as well? Finally, I have a LiPO 4S pack which produces 14.8 V fully charged, and a LiFePO 4 pack which has the potential to produce 14.4 v fully charged. I use these packs with QRP IRF510 PAs and I get a bit extra juice. Will these slightly higher voltages stress the Mk II PA in any way? Thanks in anticipation, looking forward to sharing progress on this project, regards Paul VK3HN.

Hello to all, letting you know Andy has downloaded 4 files about the latest project The Irwell Tcvr, Have a look, it is what we have been waiting for and there will be more to come hopefully asap 73 G6YAQ

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the [email protected] group. File: G6LBQ PCB for H-Mode Mixer With RF Port Switch.pdf Uploaded By: g6lbq Description: PCB Cad image and built module view of H-Mode mixer module with RF port switch for the G6LBQ Irwell Transceiver. You can access this file at the URL: /g/G6LBQ/files/G6LBQ%20Irwell%20Transceiver/Irwell%20H-Mode%20Mixer%20Stages//G6LBQ%20PCB%20for%20H-Mode%20Mixer%20With%20RF%20Port%20Switch.pdf Cheers, The Groups.io Team

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the [email protected] group. File: Schematic Revision 1.0.pdf Uploaded By: g6lbq Description: Schematic diagram of the G6LBQ Irwell Digital Interface Module. Can be used with other commercial or homebrew transceivers. You can access this file at the URL: /g/G6LBQ/files/G6LBQ%20Irwell%20Transceiver/Irwell%20Digital%20Interface/Schematic%20Revision%201.0.pdf Cheers, The Groups.io Team

I am building a MK2 version in a modular form (stage wise) using the Manhattan method. BPF Question - Is the BPF common to both RX & TX (with no change at all) ? Thank you. 5Z4BT

Need to build, or buy a kit, of an IQ Quadrature out test oscillator. Haven’t seen anything around!

Can the 74AC74 be configured as a fundamental squarer, ( no with need to divide) with 180 and 0 out?

Hi again My homebrew (scratch built) G6LBQ BiTx txcvr is assembled and in debug stage. Overall, I'm pleased with the results, the Rx has lots of gain and the AGC works well. I routinely enjoy listening to US amateurs on 7.150 to 7.170 in my evenings here (VK3), despite the quite poor band conditions being experienced around the world right now. My build is: - Arduino Nano/LCD/si5351 with a single broadbanded 2n2222 buffer/amp for both VFO and BFO - TDA2003 replaces LM386 - IF is 9MHz - 5 (not 6) crystals in the filter, capacitors are 68p and 82p, couplings are the original 100p, the filter is a little bassy so I will experiment with some smaller values to move the passband a bit higher - PA uses one RD16HHF1 (not two in push pull) in a standard QRP 5W PA circuit - For T/R switching, one digital input on the Nano senses the PTT switch going low, then raises another digital output, which pulls in the two relays on the PA board; one relay has a set of contacts that switch 12v between the low level stages of the Rx and Tx. Otherwise it is exactly as per the MkII circuit diagram. The build is on a hand drawn PCB that is mostly ground plane, and with surface mount parts. The Exciter board is bolted tightly to an aluminium case lid. The MC1350 took a few tries to get aligned, it was distorting until I got the tuned circuit on its output pins close to resonant, but now the receiver sounds clean and shows no signs of instability. Back on the AGC, mine is not quite adjusted right yet, the no-signal voltage is too low, so when you turn on the AGC the receiver noise level drops too far. The AGC action is good on strong signals. The curious thing is that when I press PTT there is a sharp chirp of audio generated. It is as loud as the subsequent spoken voice, starts off about 1khz and drops quickly, lasting about 100-200mS. It is prominent enough that it will draw comments from other stations in a QSO. It suggests an electrolytic capacitor charging/discharging. I removed the 50uF supply filter cap on the mic amp -- no difference. I reduced the 10u in series with the mic amp hot input to 2u, no change. If I manually switch the rig to Tx it still happens, so it might have something to do with power switching between Rx and Tx. Just wondering if anyone has seen this. The Tx is working too, but becomes unstable with the PA bias above about 400mA, so it needs better shielding, I'll spend some quality workshop time with hacksaw file and PCB stock to create some compartments inside the box. 73 Paul VK3HN.

My Almost completed BitX transceiver that I brought back from the USA with me is still sitting in the loft. I will never get time to complete it so I am offering it as a package for someone else to apply the final touches. The package includes the following:- Built and aligned Exciter Module Built and aligned Lowpass filter Module Built and aligned Bandpass filter Module Built PA Module with heatsink Exciter dc switching relay board Unopened VFO kit Custom Case Plugs / pins for exciter connectors (currently wires soldered directly) All modules have SMA RF connectors, matching interconnecting leads included (see photos) It has had qsos in the past with external VFO and TR7 amp, but needs controls wiring and new meter fitting (the old one didnt survive the trip home!) Photos are at http://g4fre.com/sale.htm Asking ?200 plus shipping to mainland UK Email me if interested Dave G4FRE

Hello to all homebrewers, Just to let you know I visited Andy G6LBQ a few days ago and saw that the IRWELL TRANSCEIVER is very much alive and kicking,latest update is that it will be double conversion,with H mode mixer,front end preamp, and Hi p3,Ham Bands and also General coverage on CW,SSB,AM,FM.To go with this will be a first class IF filter system and audio design etc,so it will be a top of the range RX! which is very near to completion. (it appears there is nothing like it on the market for us at present).The TX will also be of an upmarket spec with all the trimmings.. Andy who has designed the IRWELL from scratch has had some personal problems etc, which has meant a delay on progress has put an enormous amount of personal time devoted to the project which is now coming to fruition hopfully in the near future full details of the IRWELL will be revealed by Andy on here he says in a very short while, along with pic's of the prototype modules and test results.I know I just can't wait to get the solder smoking again,how about You? So thats it for now our loyal group has something exciting and worth waiting for. Best 73 G6YAQ (Frank)

i search a ubitx ready to by for used and test in dxpediiton, any proposals via email iz8ccw@... thanks in advance Ant iz8ccw ____________________________ .'. IZ8CCW .'. Ant Cannataro MDXC #004 www.mdxc.org/iz8ccw ARRL DXCC Card Checker

Hi Everyone The PCB's for the G6LBQ multiband project have arrived and I will start to prepare them for shipping today. You can expect an email soon to confirm your boards have shipped but please be patient as it will likely take me a day or two to process them all. Those of you who have paid a deposit and have a balance to pay will receive an email requesting a final payment prior to shipping. I will soon be finalizing the PCB artwork for the MK3 LowPass Filter module so keep an eye out for a new database for registering your interest. Kind regards Andy de G6LBQ

Hi, Anyone offer advice on best connection points for sotabeam variable ssb audio filter? See sotabeam website sorry have problems with copy and paste on tablet computer. 73 Toni g6xmo. Sent from Yahoo Mail for iPad

Hi All: The Boards and parts have been spoken for, thanks to everyone who responded. 73 Ross Bell K7RSB

HI: I have the following items for sale: 2- G6LBQ MULTI BAND-BITX PCB's 1- Filter adapter PCB 1- Bandpass filter board 1- Bags of parts of most of the parts required to assemble the MULTI BAND-BITX. I not sure what a fair value is for the above items, please make offer I will include shipping and in the offer. Thanks for the consideration, 73 K7RSB Ross Bell

Hi Everyone If you have ordered PCB's for building G6LBQ transceiver modules I have some news! The PCB's are scheduled to be with me the week commencing the 7th of march. Once they arrive I will inform the group and begin shipping. Kind regards Andy de G6LBQ