Keyboard Shortcuts
Likes
Search
DC Power in Bitx-40
|
Pat Anderson
I am almost there, a case of sorts will arrive on Sunday. I understand most of the wire-up directions, but I am now trying to reconcile the wire-up diagram (on 2/11 of the wire-up directions) with the text on? DC Power Connections (on 3/11), as well as how? to connect the Raduino power, both positive and ground, do it is controlled by the off/on switch, which is neither illustrated nor explained in text. Header text for DC Power Connections, the DC power from the socket goes to the board through the off/on switch through the off/on swtch on the volume control. Check. The next sentence is very confusingly worded though: from the OFF/ON switch, route the power a parallel connection also goes to the power amplifier." If this a direction to do something with "route" as a verb, or a description? Does this mean I can remove the separate cable from the board? that says PA Power since power also goes there? I am guessing that is what it means and I do not need to route anything to the power amplifier. Correct? First bullet sentence, use two-wire connector as shown in diagram to supply DC power to the board - check! Clearest direction in the DC power section! Fourth bullet sentence, you may route the positive power line through the ON/OFF switch on the volume control - don't get this, seems inconsistent with the header text. Isn't power already routed there from the PWR1 connector to the off/on switch on the volume control?? Fifth bullet sentence, use another PA POWER line to feed power to the Power Amplifier, this is shown on the top-left of the ow the wiring diagram. Same head scratcher, what is shown is just the wires going off the? left edge of the board, not connected back to where the 12 volt power comes in according to the first bullet sentence. I am assuming the Power Amplifier already has power going to it from the volume control, this is only if I wanted to supply a higher voltage to the PA, so I could remove the cable from the PA Power connector? Correct? Wire up the Raduino (on 4/11), again, the Raduino power wires are just sort of out there hanging in space without referencing connection to where the power comes into the main board. Plus, I want the Raduino power to be controlled by the off/on switch on the volume control as well, don't I? How to do that? My guess is just bring those power wires back to connector where power comes into the board? The patience and helpfulness of the collective has been very much appreciated, once again I am asking for help to cross the finish line! TIA! Pat Anderson KD7OAC |
|
Pat
If this is like the ubitx, the bias to the IRF510 is separate to allow running it at a higher voltage. No this is RF power amplifier,? no connection with the audio volume control, pu intended.? I like to check my work before making connection with the circuit board. Raduino itself operates at 5 volts. Locate the regulator, and you should understand its feed from 12 volts. In ubitx this happens within the circuit board. As you wire up 12 volts, note the negative side goes direct to the circuit board, while the plus side may ge routed through a reverse protection diode, a fuse, and a power switch. I have my main and PA wires connected after the power switch. Curt |
|
Pat Anderson
I don't think it is like the ubitx, hoping to hear from somebody who knows the bitx-40 inside and out! And the bitx-40 wire-up diagram shows? the Raduino having 12 volts?+ and minus! On Fri, Mar 1, 2019 at 12:31 PM Curt via Groups.Io <wb8yyy=[email protected]> wrote: Pat |
|
Pat Anderson
Here is the wiring diagram for the main board and the Raduino, clearly showing 12 volts to the Raduino, but showing no connection for the power back to the main board. On Fri, Mar 1, 2019 at 1:32 PM Pat Anderson via Groups.Io <anderson5420=[email protected]> wrote:
|
|
Pat Anderson
Here is the wire-up diagram clearly showing 12 volts to the Raduino. On Fri, Mar 1, 2019 at 1:32 PM Pat Anderson via Groups.Io <anderson5420=[email protected]> wrote:
|
|
Pat,
Just wire the PA power to the switch in addition to the rest of the radio. It was intended as a means to supply the RF power amplifier with a higher voltage if desired. That also makes it easier to monitor how much current that Power Amplifier is using (great for setting the bias current). Nothing magical. Just wire it so that it is switched and protected like the rest of the transceiver. -Don |
|
Pat Anderson
Thanks! And the same with the Raduino? And which tab on the volume control is the switch? On Fri, Mar 1, 2019 at 2:56 PM Don, ND6T via Groups.Io <nd6t_6=[email protected]> wrote: Pat, |
|
Firstly, Pat: please bear in mind that Farhan's English, while very good and probably the best of the 'team' in India, is a second language. |
|
Pat Anderson
Thanks for your reply, i think I understand it. The PA?+ wire CAN to the lug on the volume control with the red wire, which looking at it from the front is the left hand lug, but it doesn't have to. It could also go back to the + side on the power connector. The PA - wire can go back to the power connector ground side. The Raduino + power wire would go to the left lug on the volume control.? Everything on that lug will be controlled by the off/on switch. The Raduino - wire can go back to the ground on the power connector. Correct? I will wait on the resistor and maybe capacitor in the Raduino?+ wire until I am ready to operate - I am in Arizona, have to obtain all parts via Amazon, and won't be operating for about 6 weeks when I get back to Washington State anyway. No antenna here, and ham antennas are prohibited in the RV park where we are staying. As far as Farhan's English, no complaints, since I don't speak a word of Hindi! On Fri, Mar 1, 2019 at 8:20 PM Dexter N Muir <dexy@...> wrote:
|
Don, ND6T