Pete G4HAK, good night. You have already observed the value of C81 and if VR-1, it is at the limit switch (counterclockwise). See in previous posts related to the subject. I believe that in order to g

Evan, Obrigado pelas imagens. Consegui queimar mais IRF510, hoje a tarde. Inclusive os condutores +B (13,8Vcc e +B PA Power). Evan, Thanks for the images. I managed to burn more IRF510, this afternoon

Hi Evan It was feeding the PA with 20Vdc, through a boost (step up converting 13.8Vdc to 20Vdc), therefore with a different power supply. I noticed that I am not receiving any signal on JTDX (FT8) at

Hi Bill, What value of C81, would you recommend to have better performance in the frequency of 7,074MHz (40 in FT8). In the diagrams we find several recommendations for values for C81: 470pF, 100nF, 1

Hi Bill, No recent reviews! Thank you for remembering the Q90, I will check if it broke or changed, it is better to change it. I will take the opportunity to check from C80 onwards. Grateful for the t

Bill Thanks for answering me! Obviously, I fulfilled the ritual to the letter, as I have been in the maintenance area for over 45 years. With reference to the voltage gradient of the converter booster

All Step Up (boost converter) arrived, so I get 20Vdc output from 13.8Vdc input, I used 20Vdc to power PA Power of uBITX v4, when adjusting the Ibias, the current went up at once reaching 15A , obviou

Ricard, good morning, I'm from Brazil, Ilha Solteira, a barrageiros village in the interior of the state of São Paulo. I have an uBITX v4, and I don't hear anything on the normal audio output, I neede

#audiocircuit

Evan, Ok, tks. 73 de Rubens py2pvb --Saudações fraternais, 73/51 PY2PVB Rubens Kamimura Tel. (18) 3746-8680 ramal 116 Cel. (18) 9-9819-2225 WhatsApp ou (18) 9-9819-2255 Em ter., 7 de abr. de 2020 às 1

Tks --Saudações fraternais, 73/51 PY2PVB Rubens Kamimura Tel. (18) 3746-8680 ramal 116 Cel. (18) 9-9819-2225 WhatsApp ou (18) 9-9819-2255 Em ter., 7 de abr. de 2020 às 14:19, Evan Hand <elhandjr@gmail

ALL I have uBITX v4 and use it only for FT8 in 40m, but the IRF510 outputs are burned, I am changing them, how do I check if the bias and power settings are correct? a) I check the tension in the GATE

ALL I have uBITX v4 and use it only for FT8 in 40m, but the IRF510 outputs are burned, I am changing them, how do I check if the bias and power settings are correct? a) I check the tension in the GATE

Request for help replacing IRF510 by RD16HHF1 on uBITX v4, what changes should I make? a) RD16HHF1 resting currents? b) T11 how do I do it? c) D-G feedback? d) Capacitance between the RD16HHF1 Drains?

Boa noite, grupo. Tenho um uBITX V4, e queimaram as suas saída IRF510, não tenhos IRF510 de reserva, mas tenho no estoque dois RD16HHF1, posso trocar por IRF510, quais as providências neste caso? ----

Help !!! I have an uBITX v4, it has low power problems in 40m, so I would like to check the power output settings. How do I adjust the idle current in the uBITX v4? I have a milliammeter connected to