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Hi Rahul I will do a blog post soon on my Irwell HF transceiver 2nd mixer stage and document the process I use to arrive at the component values etc. Regards Andy (G6LBQ)

Hi Rahul Look at Item 17 in the Solid State Circuits section of my technical web site for the formulae for a diplexer. You just need to decide on the Q that is required. 73 Bob Bob F Burns G3OOU,

Hi Andy, You can use the PCA9540B i2c multiplexer to drive multiple si5351 VFOs with ease on the same bus without using any extra IOs. I have extensive software experience and can assist with

Hi Everyone I have uploaded files for the STM32 BluePill based digital VFO including the software. The VFO is based on the work of radio hams JA2GQP and JA2NKD to whom I acknowledge for there

Hi Andy, Can you indicate how to calculate the diplexer values for a 70 MHz IF. I have a 70 MHz IF and would like to add a diplexer. If you could explain the choice of values that will be great and

ok , I have T37-6 & T50-6 , Can you guide which wire number to use for winding these cores for better Q factor ? Sent: Wednesday, 27 October 2021 10:25 PM To: [email protected] Subject: Re:

You could used SMD inductors but beware the Q value and tolerance could be an issue. If you stick to using the T37 cores the Q value will be fine and providing you have the means to measure the

Hi Andy , kindly share your e -mail. Regarding L1 & L2 , can we use here fixed inductor SMD 1206 or 1210 size or need a toridal Core like T50-2/6 ? Cheers , 73s , AP2RF Sent:

Hi Riffad Have a look at the BFU590G device as an alternative to the NE46134 it is a current device and available from

Hi there Some good information and tips there! I used this Bridged Tee Diplexor Calculator to get values for a 9mhz IF, it worked well, here: https://www.changpuak.ch/electronics/calc_16a.php I

Hi Rahul , Greetings ! Wonderful Ideas , Thank you very much indeed ! I further explained my project in last post. Kindly do look into ! 73s AP2RF Sent: Wednesday, 27 October 2021

Hi Andy , many thanks for the kind reply. Really a nice project ! I just found NE46134 on AliExpress : 10pcs NE46134 SOT 89 NE46134 T1 AZ SOT89|Integrated Circuits| - AliExpress

Hi Riffad I have just updated the files for the Irwell 2nd Mixer stage & Post mixer amplifier and the NEW schematic contains diplexer component values for 9MHz as well as 11.059MHz Please take a

Hi AP2RF and Andy, ----------------------------------------------------------------------------------------------------------------------------- #1 Here is an explanation of how to calculate the

Hi Dear Andy, It's AP2RF here, I need your help regarding choosing components values for my 9 MHZ ?IF Stage. Circuit: IRWELL MIXER STAGE, DIPLEXER & POST AMPLIFIER L1 - 3.58uh / 58pf L2- 440nh /

Hi berg Thanks for the information regarding the Czech republic crystal filter supplier and well worth bookmarking for future use. I have seen projects based on the Si4732 which is an interesting

The Cascode IF amplifier has been updated to version 2 and I will update the files section for this soon once I have posted information on my blog page. Regards Andy (G6LBQ)

Hi Andy, I forgot to mention that i am also building a general coverage receiver (0 - 30 MHz) of my own and for the AM detector I am using a Si4732 radio receiver chip as an IF processor. It works

Hi Andy, The schematic for the cascode IF amplifier is missing the 47uh value designation for L4 in the schematic. Can you please add that. Thanks !

Hi Everyone I hope you are all keeping well during the difficult times attributed to the Covid19 pandemic. I am slowly updating the files section for my Irwell transceiver so you may notice that