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It has been a while since I updated my blog with progress regarding the development of my Irwell HF transceiver and for those who have been following the project, I realize you may find the lack of updates frustrating and I get it! Now, while it may appear that I have not been working on the project, I can assure you I have and the next blog post will be coming soon. In short, I have had a frustrating time with the design of the modulator, which has turned out to be a greater task than I envisaged. Making the decision to include FM as a mode of operation opened up a rather large a can of worms. The microphone amplifier circuits I featured in my last blog post are fine for SSB and AM modulation but not ideal for FM modulation, as they lack pre-emphasis. Also to avoid over deviating in FM mode some form of clipping/limiting is required, then there is the small matter of how to implement FM modulation at the component level. In the end I decided to generate the FM modulation using a PLL IC and VCO. This was no easy task, as the PLL chip data sheet was a nightmare to make sense of and I had a huge learning curve writing the software to control the PLL IC, I am not a software engineer and my knowledge in this area is limited to what I have taught myself. After building various prototype circuits and many hours of work, I feel I have achieved my design goal and I am now in the process of finalizing a suitable PCB for the module. Once I get the PCB's back from fabrication, I will build and test one and if all goes well, I can move onto the final few modules needed to complete the project. I will go into much greater detail when I update the blog. For now, best 73 from Andy (G6LBQ)

Hello everyone, I landed on this group in search of transceivers that are similar to the ubitx. ubitx is ok but like one post stated from prototype to production in a short time.Has had alot of problems from the start plus lots of noise and harmonics measured from my little tiny ultra. i found links which led me here regarding the g6lbq project of a multiband transceiver. is this project still going? did the transceiver get into production and if so where is the links to go to either find more out or purchase it. any one have any info or am i too late on the scene?HI HI 73 David ac9xh

Hi everyone, Just a quick heads up, I have updated the blog this evening with a post regarding the development of the modulator microphone pre-amplifier stages. https://g6lbq.blogspot.com/ Best regards Andy G6LBQ

Hi Everyone I have just finished building my RF Multicoupler for feeding several receivers/scanners from one antenna. Details for the project are on my blog and I will post the files to the group in a couple of days. https://g6lbq.blogspot.com/2024/01/a-vhf-uhf-rf-multicoupler.html Best regards Andy G6LBQ

Hi Andy, hope you doing well? I’m busy with the MK2 multi bitX still as I don’t have a lot of spare time these days and it’s dragging on a little… But I was thinking of something and need your advice… my DDS VFO can have offsets for USB and LSB which I’ve never used before on all the radios I’ve used it on as they all have carrier oscillators to switch between like yours. My question is this… my IF is 11.059Mhz so if I locked one CO to 11.059Mhz and used the offsets in the DDS VFO to resolve SSB audio would this idea work? Sorry to sound like a novice again I feel I’m starting from scratch as I’ve been away from the shack for so long… If this idea is valid it would make construction etc a lot easier and only one CO needed. Anyway thank you for your time you give to us with your work and ideas, yours Paul M0EME

Just a quick post to let everyone know I have updated the blog with an overview of the Irwell Transceiver VFO software. I am aware the files section is in need of some updates and hope to do that very soon. If you have not visited the Blog head over to: https://g6lbq.blogspot.com/ Finally I wish each and everyone of you in the group a peacefull and prosperous 2024. Andy - G6LBQ

Hi all, The Irwell AF schematic shows an ADE-1 mixer. Although still available, the ADE-1-24 seems to be easier te get, and cheaper (I know, I'm Dutch, ;-) ). I have read that the ADE-1-24 can be substituted for the ADE-1, but I have also read that that is not the best idea. Does anyone know what the wisest thing to do here would be ? Thanks, 73, Hans

Hi Andy, I searched for Gerber files, but couldn't find much. Looking forward to try and build the Irwell trx this winter, but are there any Gerber files available ? Cheers, Hans PA3CRZ

A new chat has been created: hi Andy been looking at your latest blog on the iwell,its looking very good been pondering wether to have a go at it or at least a start to get some items built for it what do you think? FrankG6YAQ By: G6YAQ <knarf1@...> View/Join This Chat Do not reply to this message to post to the chat. You can participate in chats only through the group's website.

Are the gerber files for the board (SSB exciter mk2) available? 73s Hubert F6duk

Hello all has anyone got a MK2 if amplifier board or complete please 73s

Thank you for accepting me into the G6LBQ group. It seems to be a fascinating group fulfilling the real amateur spirit of radio as ITU refers to, establishing the radio-amateur service. I guess I am here to have a pleasant time trying to recover the new developments in radio! 73's de sv1acw Panos Athens/Greece -- de sv1acw

The following files and folders have been uploaded to the Files area of the G6LBQ@groups.io group. /G6LBQ Irwell Transceiver/STM32 Si5351 VFO/Oscillator & Multiplexer Module/G6LBQ_Irwell_VFO_Osc_Module_Rev2.0 .pdf .pdf By: g6lbq <ah.electronics@...> Description: Schematic For G6LBQ Irwell HF Transceiver Oscillator & Multiplexer With TCXO.

Hi all Having just resurrected my G6LBQ Multiband BITX transceiver I discovered a problem with the PA. Historically I had issues with a splurge of carrier and stuff as I went from TX to RX. Now fixed. However the PA stage is playing up, and taking it of the case and testing results in the BC640 transistor giving up as soon as I go to TX. I cannot measure the idle current (35mA). Has anyone else had problems with the Mk 1 PA ? I notice there is a MK2 and a MK3 so am wondering if there was a common problem, hence the new versions ? Cheers Adrian M1LCR

Hi Andy, hope you doing ok mate?

Hi Everyone I have just posted details on my blog detailing the Irwell transceiver modulator. The web link to the post is: https://g6lbq.blogspot.com/2022/02/balanced-modulator-for-irwell-hf.html I hope it is of interest! Regards Andy (G6LBQ)

Hi Andy, Your update to the IF amp/agc looks great. Had few questions as outlined below. If I were to use the AD8361 outside of your agc circuit as a AM demod what is signal range in dBm that it can successfully demodulate ? E.g -40dBm to -10dBm Can you indicate the input matching component values in your IF/agc for an IF or 9 MHz or 10.7 MHz Also could you help with calculating the diplexer values in your mixer for an IF or 10.7 MHz and 45 MHz ? The current values in the diplexer are for 11.059 MHz. Can you explain your component value choices for 11.059 MHz ? I looked at the values and somehow they didn’t seem to match the expectations below. Series LC branch XL = XC = 50 x Q factor at IF freq Parallel LC branch XL = XC = 50/ Q factor at IF freq Kind regards Rahul.S