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Irwell Mixer Stage

R-TEK All Messages By This Member #1882 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 / 470pf ? ? Kindly also guide on possible replacements like? BFG135 and 2SC3357 OR 2SC5551? can be a replacement of NEC? ? 73s and kind regards, Riffad / AP2RF
RAHUL SAPRE All Messages By This Member #1883 开云体育 Hi AP2RF and Andy, ? ----------------------------------------------------------------------------------------------------------------------------- #1 ? Here is an explanation of how to calculate the values ? ? Andy is the expert here, (Andy please let us know how to decide on the factor if it should be 5, 10 or something else) but ? The way to calculate this is as follows you choose a factor (Andy appears to have chosen 5) ? For the series LC branch, XL should be equal to XC such that it needs to be [50 ohm (design impedance) x the factor] ? So 50 x 5 = 250 ohm reactive ? So XL = 2 x pi x f x L ? XC = 1/ (2 x pi x f x C) ? Both should equal 250 ohm reactive, see sample calculation of XL below for the series branch. ? So L = 3584.6 nH? XL = 250 ohm ?? C = 57.4 pf??? XC = 250 ohm ? ? ? ? For the parallel LC branch, the impedance should be XL = XC = 50/factor = 50/5 = 10 ohm ? We get ? C = 1433.8 pf ??XC = 10 ohm L = 143.4 nH ???XL = 10 ohm ? Andy has already added a caveat here that availability of components dictated his design choices. (in the pdf) ? ? ? We get identical results from this online calculator see below () ? ? ? ? ----------------------------------------------------------------------------------------------------------------------------- #2 ? With reference to your question for an IF of 9 MHz, see results below for the diplexer values, ? ? ----------------------------------------------------------------------------------------------------------------------------- #3 ? With reference to your amplifier question, I believe all the transistors you list are obsolete. However I have a stock of 2n5109s and use the amplifier from here, works really well. ? ? See the mixer section, ? ? See the broadband amplifier, ? ? ? See another broadband amplifier using the 2SC5551A (this is also obsolete) ? ? ? ? ? Vendor for the NE46134 (last 3 remaining) ? ? ? Another link for the 2N5109 ? ? ? Kind regards
g6lbq All Messages By This Member #1884 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 look in the files section under 2020 Receive Mixer Stage (DBM) It is late now in the UK and I need to get off to bed but I will look at alternative SMD transistors for the NE46134 and get back to you hopefully tomorrow. For now best regards... Andy (G6LBQ)
R-TEK All Messages By This Member #1885 开云体育 Hi Andy , many thanks for the kind reply. Really a nice project ! ? I just found NE46134 on AliExpress : ? Not sure if these are original or not . Any one tried that ? ? I have 2N5109 , 2SC3357 , 2SC5551? with me . ?Which one would be the best substitute ? or may I buy NE46134 from Ali Express ? ? I wish to use mixer circuit ?as first stage mixer ?, Here is my receiver scheme / Idea ?: ? BPF - RF PRE AMP ( RCA 40673) ?- G6LBQ Ver 2 mixer = 9 MHZ IF to AD603 x 2 ( IF AMP ) - ADE-1 + AD797 ( DEMOD) = NJM 2114 + NJM 4580 ( AF Filters ) = LA4425. ? Kindly also guide if I can have your Mixer PCB ? ? Cheers , 73s AP2RF / Riffad ? ? toggle quoted message Show quoted text From: G6LBQ@groups.io [mailto:G6LBQ@groups.io] On Behalf Of g6lbq via groups.io Sent: Wednesday, 27 October 2021 3:14 AM To: G6LBQ@groups.io Subject: Re: [G6LBQ] Irwell Mixer Stage ? 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 look in the files section under 2020 Receive Mixer Stage (DBM) It is late now in the UK and I need to get off to bed but I will look at alternative SMD transistors for the NE46134 and get back to you hopefully tomorrow. For now best regards... Andy (G6LBQ)
R-TEK All Messages By This Member #1886 开云体育 Hi Rahul , Greetings ! ? Wonderful Ideas , Thank you very much indeed ! ? I further explained my project in last post. Kindly ?do look into ! ? 73s AP2RF ? ? toggle quoted message Show quoted text From: G6LBQ@groups.io [mailto:G6LBQ@groups.io] On Behalf Of RAHUL SAPRE Sent: Wednesday, 27 October 2021 1:19 AM To: G6LBQ@groups.io Subject: Re: [G6LBQ] Irwell Mixer Stage ? Hi AP2RF and Andy, ? ----------------------------------------------------------------------------------------------------------------------------- #1 ? Here is an explanation of how to calculate the values ? ? Andy is the expert here, (Andy please let us know how to decide on the factor if it should be 5, 10 or something else) but ? The way to calculate this is as follows you choose a factor (Andy appears to have chosen 5) ? For the series LC branch, XL should be equal to XC such that it needs to be [50 ohm (design impedance) x the factor] ? So 50 x 5 = 250 ohm reactive ? So XL = 2 x pi x f x L ? XC = 1/ (2 x pi x f x C) ? Both should equal 250 ohm reactive, see sample calculation of XL below for the series branch. ? So L = 3584.6 nH? XL = 250 ohm ?? C = 57.4 pf??? XC = 250 ohm ? ? ? ? For the parallel LC branch, the impedance should be XL = XC = 50/factor = 50/5 = 10 ohm ? We get ? C = 1433.8 pf ??XC = 10 ohm L = 143.4 nH ???XL = 10 ohm ? Andy has already added a caveat here that availability of components dictated his design choices. (in the pdf) ? ? ? We get identical results from this online calculator see below () ? ? ? ? ----------------------------------------------------------------------------------------------------------------------------- #2 ? With reference to your question for an IF of 9 MHz, see results below for the diplexer values, ? ? ----------------------------------------------------------------------------------------------------------------------------- #3 ? With reference to your amplifier question, I believe all the transistors you list are obsolete. However I have a stock of 2n5109s and use the amplifier from here, works really well. ? ? See the mixer section, ? ? See the broadband amplifier, ? ? ? See another broadband amplifier using the 2SC5551A (this is also obsolete) ? ? ? ? ? Vendor for the NE46134 (last 3 remaining) ? ? ? Another link for the 2N5109 ? ? ? Kind regards
Paul VK3HN All Messages By This Member #1887 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: I also made a video about my diplexor experiment,? here: Happy building! Paul VK3HN.? toggle quoted message Show quoted text On Wed, 27 Oct. 2021, 17:32 R-TEK, <riffad@...> wrote: Hi Rahul , Greetings ! ? Wonderful Ideas , Thank you very much indeed ! ? I further explained my project in last post. Kindly ?do look into ! ? 73s AP2RF ? ? From: G6LBQ@groups.io [mailto:G6LBQ@groups.io] On Behalf Of RAHUL SAPRE Sent: Wednesday, 27 October 2021 1:19 AM To: G6LBQ@groups.io Subject: Re: [G6LBQ] Irwell Mixer Stage ? Hi AP2RF and Andy, ? ----------------------------------------------------------------------------------------------------------------------------- #1 ? Here is an explanation of how to calculate the values ? ? Andy is the expert here, (Andy please let us know how to decide on the factor if it should be 5, 10 or something else) but ? The way to calculate this is as follows you choose a factor (Andy appears to have chosen 5) ? For the series LC branch, XL should be equal to XC such that it needs to be [50 ohm (design impedance) x the factor] ? So 50 x 5 = 250 ohm reactive ? So XL = 2 x pi x f x L ? XC = 1/ (2 x pi x f x C) ? Both should equal 250 ohm reactive, see sample calculation of XL below for the series branch. ? So L = 3584.6 nH? XL = 250 ohm ?? C = 57.4 pf??? XC = 250 ohm ? ? ? ? For the parallel LC branch, the impedance should be XL = XC = 50/factor = 50/5 = 10 ohm ? We get ? C = 1433.8 pf ??XC = 10 ohm L = 143.4 nH ???XL = 10 ohm ? Andy has already added a caveat here that availability of components dictated his design choices. (in the pdf) ? ? ? We get identical results from this online calculator see below () ? ? ? ? ----------------------------------------------------------------------------------------------------------------------------- #2 ? With reference to your question for an IF of 9 MHz, see results below for the diplexer values, ? ? ----------------------------------------------------------------------------------------------------------------------------- #3 ? With reference to your amplifier question, I believe all the transistors you list are obsolete. However I have a stock of 2n5109s and use the amplifier from here, works really well. ? ? See the mixer section, ? ? See the broadband amplifier, ? ? ? See another broadband amplifier using the 2SC5551A (this is also obsolete) ? ? ? ? ? Vendor for the NE46134 (last 3 remaining) ? ? ? Another link for the 2N5109 ? ? ? Kind regards image001.png image003.png image004.png image008.png image009.png image010.png image011.png image011.png
g6lbq All Messages By This Member #1888 Hi Riffad Have a look at the BFU590G device as an alternative to the NE46134 it is a current device and available from Farnell >>> I just found NE46134 on AliExpress : I can confirm I purchased a quantity of NE46134 from the above Ali-Express seller and what I received are working fine so I assume they are original devices, they perform exactly the same as the original devices I purchased from RS Components some time ago. I do have the PCB's for the mixer so please email me direct if you are interested. Regards Andy G6LBQ
R-TEK All Messages By This Member #1889 开云体育 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 ? ? toggle quoted message Show quoted text From: G6LBQ@groups.io [mailto:G6LBQ@groups.io] On Behalf Of g6lbq via groups.io Sent: Wednesday, 27 October 2021 8:25 PM To: G6LBQ@groups.io Subject: Re: [G6LBQ] Irwell Mixer Stage ? Hi Riffad Have a look at the BFU590G device as an alternative to the NE46134 it is a current device and available from Farnell >>> I just found NE46134 on AliExpress : I can confirm I purchased a quantity of NE46134 from the above Ali-Express seller and what I received are working fine so I assume they are original devices, they perform exactly the same as the original devices I purchased from RS Components some time ago. I do have the PCB's for the mixer so please email me direct if you are interested. Regards Andy G6LBQ ?
g6lbq All Messages By This Member #1890 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 inductance values you can adjust the windings and get the required inductance spot on, this is exactly what I do and I finish off by secure the windings in place with quick drying laquer or hot glue. Regards Andy (G6LBQ)
R-TEK All Messages By This Member #1891 开云体育 ok , I have T37-6 & T50-6? , Can you guide which wire number to use for winding these cores? for better Q factor ? ? toggle quoted message Show quoted text From: G6LBQ@groups.io [mailto:G6LBQ@groups.io] On Behalf Of g6lbq via groups.io Sent: Wednesday, 27 October 2021 10:25 PM To: G6LBQ@groups.io Subject: Re: [G6LBQ] Irwell Mixer Stage ? 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 inductance values you can adjust the windings and get the required inductance spot on, this is exactly what I do and I finish off by secure the windings in place with quick drying laquer or hot glue. Regards Andy (G6LBQ)
RAHUL SAPRE All Messages By This Member #1892 开云体育 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 some mathematics behind it. This will allow us to calculate the values independently. Kind regards Kind regards Rahul.S toggle quoted message Show quoted text From: G6LBQ@groups.io <G6LBQ@groups.io> on behalf of R-TEK <riffad@...> Sent: Wednesday, October 27, 2021 12:53:19 PM To: G6LBQ@groups.io <G6LBQ@groups.io> Subject: Re: [G6LBQ] Irwell Mixer Stage ? ok , I have T37-6 & T50-6? , Can you guide which wire number to use for winding these cores? for better Q factor ? ? From: G6LBQ@groups.io [mailto:G6LBQ@groups.io] On Behalf Of g6lbq via groups.io Sent: Wednesday, 27 October 2021 10:25 PM To: G6LBQ@groups.io Subject: Re: [G6LBQ] Irwell Mixer Stage ? 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 inductance values you can adjust the windings and get the required inductance spot on, this is exactly what I do and I finish off by secure the windings in place with quick drying laquer or hot glue. Regards Andy (G6LBQ)
Bob All Messages By This Member #1895 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, G-QRP 6907, @BobFBurns Crystal Palace Radio & Electronics Club: Admin/sales site: Technical site:
g6lbq All Messages By This Member #1896 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)

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