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I just finished the CW mods and I am seeing the same issue that John, WA2FZW had. ? 1) When the press PTT in LSB mode the Rig goes into TX and I am getting full power out on voice peaks but the PTT

Thanks Jerry, great bits of info! Ok, I have some IRF510's at hand but want to try the 840 since I can source them locally, also plan to abuse 'em a bit to see how much power I can get from those.

hi all i am looking at building a ubitx from scratch but two problems. where can i buy a set of matched crystals for the filter what is the details of the transformers terry gm4dso

hi royal mail seems to have taken a hint from dhl. i received a parcel from my daughter in new zealand and was charged. terry gm4dso

Sorry I misread your email! If Q7 is dead then you could wire a 2222 or similar and it will work.

See R74 is open. Happened to me !! If Q7 is hot then R72 is open. Let us know. Raj

Hi Raj, Jerry, I'm glad I listened to you guys and didn't take out the diodes. Jerry, you were right about the VFO. ?My friends board had a nice sine wave at the output of Q7 but mine did not even

I'd suggest you get an IRF510 on hand as well, they are quite cheap. ?From the datasheet, the IRF840 has a "total gate charge" of 63 nC (nano-Coulombs), vs 8 nC for the IRF510. ?That means the

The STL files come out of Solidwork in inches. When I bring them into Simply3D, it has been set up to work in inches. There is a GRID that the part is laying on, on the screen. You can see the

Jack any update? ?For anyone who has built the tft/before and has added the if offset. Could you share the code.? Thanks and appreciate any help.? Art N2AJO

Hi Mike. I have been using an Ultimaker 2+ printer with a 0.4mm extruder and 3mm PLA filament. The walls are 2mm thick, which is on the limit for the mic/phone-connectors. I am using the OpenSCAD CAD

Alright, I'm done! No magic smoke, no popping transistors. the regulator is regulating, all bias ok. Haven?t applied any signal yet, I'm too tired for that... enough for today. The driver is a

Many thanks Jerry and Sarma. yeah, I was figuring that out by looking at the previous stage, but I always see the 7805 with decoupling caps in both input and output from the datasheet so I kept it

Here's some thread from 2016: ? ?/g/BITX20/topic/4105252 ( /g/BITX20/topic/4105252 ) Farhan says it is a decoupling resistor for a driver stage. So R144 and C142

Add an 10uF/25V and 0.1uF at the junction of R144 and Transformer pin4. regards sarma vu3zmv -- Regards Sarma

Hello everyone, I'm in the process of scratch building the BitX40 PA for a DSB rig, but I don't really understand the driver stage/7805 regulator from the schematic. R144 in parallel with a short? I

Pavel, I looked over you Si5351 library. ?I like that it is kept simple and easy to understand. I think it could be a good starting point for a stripped down library specific to the Bitx40. It

And the full tree of the software page is: https://github.com/pavelmc/bitx40/tree/smeter_AGC Best 73 Carlos CX8ABF Sent: Thursday, June 22, 2017 8:44 PM To: [email protected] Subject: Re: [BITX20]

https://github.com/pavelmc/bitx40/blob/smeter_AGC/smeter_mod.png Sent: Thursday, June 22, 2017 5:01 PM To: [email protected] Subject: Re: [BITX20] Like to test a S-meter and soon an AGC/Tx-monitor

Hi Ashhar. I assume you use the G3UUR test circuit shown in Experimental Methods in RF design or something similar. If so, when calculating the values of Cm and Lm, did you actually measure and