开云体育

Folks, I made simulations on a "discrete version" of the SL611 (component values from the Plessey 1975 data book) using LTSPICE and then upon success with teh simulaiton I also made a pcb layout.

Somewhen in the past there was a version of the SL621 AGC circuit made with individual transistors. Try searching the RSGB handbook or tech topics. Cheers, William

Added a Wiki Cheat Sheet to help anyone that may want to contribute to the Wiki. Bottom topic on the first page. James

Chuck, ? I am very interested in an AGC circuit for the BITX40. I have already installed a new audio output amp - LM386 - that works substantially better but on strong signals and a good antenna

Just a running total of how wildly successful this device has become. Thomas W Noel KF7RSF

Just curious, what does the serial number tell you?

I bought a wall wart, cheep when if first got my BITX40.. from ALLELECTRONICS.COM because-- always a because --it was cheep, had the power connector on it and-----AND--- I also needed to order other

PDF will be best for home brewing Regards Lawrence va7jbe@...> wrote:

Farhan jee, Except the first mixer that handles 45MHz with 57MHz carrtier, others could be almost compatible. you , I suppose , need to give specifics of trafos of 1st mixer only. regards sarma

The serial number is difficult to read but looks like 43-228. Randy Hall <listk7age@...> wrote:

No problem Simon, Now its good time at Melbourne for a beer or to try another hack on bitx40. Try this: 1. Power the audio stages directly by connecting 12V line to the junction of R111, R113 and

Raj It appears I have misunderstood what this mod is trying to achieve from the start. Thankyou for your explanations. Regards? Simon VK3ELH

Simon, This hack does not address the sound in the BITX40 speaker. This is entirely a different issue. In my unit the power meter would deflect to more than 500mW when the PTT is pressed. IF I

That's about right. Been busy with lamakaan anniversary.. i will post the values after confirming them in the prototype builds. - f [email protected]> wrote:

Raj I checked the balance using my scope. The balance didnt seem to need any adjustment and the leakage measured the same as without the cap. The cap was 0.1uf. While a current burst through the

Nice AndyH. Let me correct myself, playing with www.toroids.info shows that the nH and 1.1 uH values are a poor choice for FT 37-43.

Ashhar, Here's my first attempt from posts, the schematic, and from your web text. ?Please confirm T1 thru T11 and the choice of 26 AWG. ?Please also provide winding details for T5 and T6, and T10

Craig, Taking a good look at the picture of a built version on?http://www.phonestack.com/farhan/ubitx/ubitx.html ( http://www.phonestack.com/farhan/ubitx/ubitx.html )?,my eyes tell me that?toroidal

A question for the UK guys. What sort of delivery times are you experiencing? I have to be in UK around 23-25 of March. Thinking that might not be enough time if ordered now. Thanks Martin,

A good power supply always makes a big difference to the way a radio operates; I think the Bitx40 is a great opportunity to build a power supply, with a big capacitor and a line filter and a