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Raj, Thanks for ur reply. I understand that VFO shaft is 6mm but the volume shaft is 4mm. I will try to find again a knob for 4mm shaft and also the 6mm pot and switch, just in case. Thank you for

Hiro, The Volume control is 4mm with switch. So if you are at Akhiabara tomorrow pick up a 10KA pot with switch (if required) of 6mm type. Raj

If you set semiQSK to ON (in the SETTINGS menu, CW params), then the radio will automatically switch to CW mode as soon as the CW key (or tune button) is pressed. To return to SSB mode, just press the

I got a 12V 5A regulated power supply with ferrite core for noise filter, plus I got 10 pieces of extra ferrite core, just in case. I also got some knobs for VFO and volume which shafts are 6mm. Is

Ordered it and will try. I needed a variable PS for some other purpose. For bitx I use one of the many bench power supplies in my collection. Earlier I modded a laptop charger to make it variable but

Wow!, my uBITX has been shipped!! Many, many thanks for all who advised to me. BR, // hiro, JJ1FXF 2018/06/30 10:38、hirosmb JAZZ <hirosmb@...>のメール:

Looks good, but switch mode supplies can cause a lot of RF interference. Have you tried it? Cheers -- John VK6JAH

Sorry Allard. Figured it out now. I did not have the BitX in CW mode via the Function push button. All works now! Cheers -- John VK6JAH

Hi Allard Went to add a Tune button to my BitX40? Raduino but cannot get it to work. As suggested, added a push button in series with a 1K resistor between pin A1 on connector P1 to ground, as well

<https://www.banggood.com/9-24V-3A-72W-ACDC-Adapter-Switching-Power-Supply-Regulated-Power-Adapter-Supply-Display-p-1237159.html?rmmds=search&cur_warehouse=CN>LINK

I had suggested regulating the voltage, but didn't consider that pot. I agree with the above.

Trying to make it simple. You regulate the voltage. Let the device draw how ever many amps it needs or wants. In the case of the ubitx it will be around 2 to 3 amps depending on the power it is

I tried a mod like this and the gain dropped so I split the feedback resistor by 2 and bypassed to ground with a 10uF at the center. Sounds great now.

Thank you, Tim. That's certainly a better answer than assuming I want to overdrive it, or telling me what I already knew, that I needed to regulate it. I'll check RV1. I'm still a bit confused about

Thanks, Allison...looks interesting. Jack, W8TEE

Another that more closely resembles the V4 circuit with improvements. The two NPN can be 2n3904 and the pnp is 2n3906. I've used this flavor from 5V though 20V.? At 12V it will put 250mW in to a

Tim no. The problem is if the first transistor Q71 is not biased to the half power supply point the output are both unbalanced and the bias is wrong.? IF Q71 collector is not at about 6V (for 12V

It's possible this might work on Linux with the Cheese application. I need to find out if this is so before I drop $200 for it though. Terry - KB8AMZ Brimfield Twp, OH USA EN91hd Linux User# 412308,

I've build SS amps for radios up to 350W and never had RF get into a power supply. I could understand if the antenna was poor and you had high shield currents but? a dummy load?? No. I'd suspect

Understanding the circuit... Both the pre-driver and driver the pairs have their own (per transistor emitter resistors) and? the idea is to have the device operating at a reasonable point that being