tag:blogger.com,1999:blog-7590176649168185428.post4779960785721296087..comments2024-03-28T08:01:27.111-04:00Comments on SolderSmoke Daily News: Building the Ceramic Discrete Direct Conversion Receiver #4 -- The MixerBill Mearahttp://www.blogger.com/profile/07662500663603350847noreply@blogger.comBlogger7125tag:blogger.com,1999:blog-7590176649168185428.post-12573195595964865182023-09-27T13:00:51.657-04:002023-09-27T13:00:51.657-04:00Muchas gracias por la respuesta ! Saludos desde Ar...Muchas gracias por la respuesta ! Saludos desde Argentina LU8ATK Esteban Pascazzihttps://www.blogger.com/profile/05452668419424089089noreply@blogger.comtag:blogger.com,1999:blog-7590176649168185428.post-47003300601802946612023-09-27T08:53:41.728-04:002023-09-27T08:53:41.728-04:00Hola Esteban. Felicidades por tu homebrew. ¡Sigu...Hola Esteban. Felicidades por tu homebrew. ¡Sigue asi hombre! <br />Sobre el transformador que use en el detector, creo que lo hice asi solamente porque tenia a mano un transformador trifilar hecho por mi amigo Farhan en Ia India. Use un alambre para el input, y puse los dos demás en serie. Creo que el resultado fue lo que mostré en la schema. Pero los valores no son críticas. Creo que puedes usar el circuito de Doug DeMaw: <br />https://soldersmoke.blogspot.com/2021/02/some-thoughts-on-singly-balanced-mixers.html<br /><br />Su tranformador usa 12 Turns trifilar on a FT-43 core. <br />Avisame si tienes problemas. <br />Suerte y 73 <br />Bill Bill Mearahttps://www.blogger.com/profile/07662500663603350847noreply@blogger.comtag:blogger.com,1999:blog-7590176649168185428.post-57118561005977154072023-09-26T19:17:10.663-04:002023-09-26T19:17:10.663-04:00hello, why L2 is 150 uh ? i see different values i...hello, why L2 is 150 uh ? i see different values in other schematics , thank youLU8ATK Esteban Pascazzihttps://www.blogger.com/profile/05452668419424089089noreply@blogger.comtag:blogger.com,1999:blog-7590176649168185428.post-42224583284624935422021-07-02T21:12:07.602-04:002021-07-02T21:12:07.602-04:00You can use a ground connection as wiper to indica...You can use a ground connection as wiper to indicate a variable resistor in LTSpice. You can fill it in using Paint later if you like.Neon Androidhttps://www.blogger.com/profile/11463515572829448379noreply@blogger.comtag:blogger.com,1999:blog-7590176649168185428.post-27901001725564143172018-08-29T04:12:53.744-04:002018-08-29T04:12:53.744-04:00Great post, I have never seen such an excellent an...Great post, I have never seen such an excellent and detailed explanationMichelle G. Mitchellhttps://www.tomtop.com/other-accessories-10208/noreply@blogger.comtag:blogger.com,1999:blog-7590176649168185428.post-65458215465406075442018-02-05T11:48:02.363-05:002018-02-05T11:48:02.363-05:00Excellent explanation, Bill!
Excellent explanation, Bill!<br /><br />N8NMhttps://www.blogger.com/profile/00670056747080667518noreply@blogger.comtag:blogger.com,1999:blog-7590176649168185428.post-44292008817834390212018-01-29T15:18:36.927-05:002018-01-29T15:18:36.927-05:00Bill
A little bit of my spin on the topic:
A perfe...Bill<br />A little bit of my spin on the topic:<br />A perfect mixing process consists of multiplying the input RF signal point-by-point with the LO signal. If the LO signal is a square wave that selects one phase of the RF when the LO is high and selects the opposite phase of the RF when the LO is low, this is equivalent to multiplying the RF signal by +1 or -1. The mathematical result of this is a conversion loss of 3.9 dB for each of the resultant sum and difference products, and a little bit of energy going into higher order mixing products. The reason a diode DBM has 6 dB conversion loss is that the diodes aren't perfect switches and have some loss resistance. You can come closer to the theoretical loss by using CMOS bus switches in place of the diodes. I built some mixers of this type and they have conversion loss of about 4.5 dB. They also have much better distortion and strong signal handling because the switches are closer to perfect.<br /><br />Joe<br />W3JDR W3JDRhttps://www.blogger.com/profile/04773514306018654594noreply@blogger.com