Ubitx.net provides help for constructors: Preventing catastrophes and providing guides, fixes and modifications for your µBITx.
CAUTION : If you power up the µBITX without the pull-up resistor the µBITX can randomly go into CW transmit. Have you installed the 4.7k pullup to 5v on the CW key pin?
v3 Board? – There are known issues with WX brand TDA2822 chips (U1): Read this. Earlier UCI and socketed TDA2822 are not affected.
v4 Board? – If your audio is distorted see this article. It is too early to determine yet whether this problem is widespread or is limited to just a few kits. Note that audio output is reduced over the v3 board. If you use a low impedance speaker you may need an additional amplifier module (LM386, TDA2822, etc.) to get adequate volume. The pop mod is not required.
Do not overdrive your rig on SSB or digital modes above 18MHz. This may cause spurs exceeding US emission requirements. Read this post for details.
SHIPPING: µBitx orders have been shipping within one or two working days of being ordered. You should receive a shipping notification through PayPal once your product has been shipped. Estimated delivery times to different countries:
EU: IndiaPost: 2-5 days DHL: 2-5 days
US: IndiaPost: 10 days DHL: 2-5 days
Asia: IndiaPost: 2-4 days DHL: 2-4 days
AU/NZ: IndiaPost:10 days DHL: 5-7 days
BITX QSO DAY: Every Sunday – 3PM & 7PM Local Time – 7277 kHz in North America, 7177 kHz elsewhere.