¿ªÔÆÌåÓý

Date
Re: Power supply fuses
Yes it should work fine,? might knock down the power a little. Would be better with 4 Schotky diodes. They are going to HEAT!?? Probably over a watt for each of the 2 conducting diodes.? On
By Michael Hagen · #51559 ·
Re: K5BCQ kits in BITX40 #bitx40
Kees has been updating his list.? Check here... /g/BITX20/files/K5BCQ/K5BCQ%20AGC-Audio%20Kit%20OrdersALPH.ods ? -- www.bitxmap.com ( http://www.bitxmap.com )
By Doug W · #51558 ·
Re: Power supply fuses
I think that bridge rectifier is a bad idea. Leaves your rig antenna port ground a diode drop away from your power supply ground. A single schottky power diode in series with the supply coming into
By Jerry Gaffke · #51557 ·
Re: Power supply fuses
Hello For my uBitx I use a Pacific Antenna kit named VoltTattler. This montage has the following features: - Simple through-hole construction - Draws only around 1 mA in normal use. - Reverse polarity
By F1BFU - Fr - 79 · #51556 ·
Re: K5BCQ kits in BITX40 #bitx40
I was wondering if my 2 AGC boards were sent yet? Thanks VE1BWV joe Basque [email protected]> wrote:
By Joe · #51555 ·
Re: Power supply fuses
I'm a newbie on here and just dipping my toe into the world of BITX's If you're running the radio at 13.8v is there enough wriggle-room to cope with a 1.4v drop using a bridge rectifier? Reverse
By martin@... · #51554 ·
Re: RF power chain mods and improvements..
Jerry, thank you so much for that running start on LT spice.
By Gordon Gibby <ggibby@...> · #51553 ·
Re: Power supply fuses
Speaking of Fusing and Over-Current protection. I am experimenting with an LT6108 for a Real Fast over current limiter. The circuit show is my 2 PCB, the LT part is fussy about getting reset. I have
By Michael Hagen · #51552 ·
Re: CW transmit bandwidth #ubitxcw #ubitx
So it's narrow when the key is down continuously, but a string of dots is 1khz wide? That would be envelope shaping.? Has to do with how quickly the transmitter turns on and off when you key it.
By Jerry Gaffke · #51551 ·
Re: RF power chain mods and improvements..
Here's another shot at embedding my Mouser search, maybe this one will work: ?
By Jerry Gaffke · #51550 ·
CW transmit bandwidth #ubitxcw #ubitx
Just got a v3 board running today.? I was monitoring CW on my IC7300 and noticed that when transmitting, i.e., a string of dots or dashes, the bandwidth would widen to 1Khz then return to very
By K3OS <garysch69@...> · #51549 ·
Re: RF power chain mods and improvements..
Here's a Mouser search for stuff with Vce of 12v+, Ic of 600ma+, Ft of 300+: ?
By Jerry Gaffke · #51548 ·
Re: Power supply fuses
Finals, PA-PWR, output devices... the same. The other is rest of rig. PLEASE, put the fuses before the polarity protect diode.? Example Fuse, reverse polarity protection diode, radio. Allison
By ajparent1/kb1gmx · #51547 ·
Power supply fuses
The "Fix reverse polarity" section on ubitx.net suggests a 0.5A fuse for the "rig" and 2A fuse for the "finals," but does not specify which wire is which.? The schematic says that the brown wire is
By KI7MWA · #51546 ·
Re: RF power chain mods and improvements..
In the old parts box I have Ck722s, 2n107, a few SB100,? 3n35 and 36(tetrodes!) and the first JFETs (GM almost 900uS, modern parts like J310 are about 20,000) also a pot load of the?early computer
By ajparent1/kb1gmx · #51545 ·
Re: RF power chain mods and improvements..
What's absolutely astounding is that it's still a good choice. The 2n2222a has slightly better specs than the original 2n2222, but not by much. Jerry
By Jerry Gaffke · #51544 ·
Re: RF power chain mods and improvements..
I forgot the speaker's name, but at the FDIM conference this year, he referred to the 2N2222 as the "cockroach of transistors". Jack, W8TEE
By Jack Purdum <jjpurdum@...> · #51543 ·
Re: RF power chain mods and improvements..
It was notable as it wasn't germanium and could handle a bit of power too. By then I'd already blown up a few 2n107s, 2n170s and anything else I could scrounge and others trying to get audio gain and
By ajparent1/kb1gmx · #51542 ·
Re: IFshift
yes Tim i am trying to do what your saying
By Eardan · #51541 ·
Re: RF power chain mods and improvements..
Yup, almost as oldie as me. From? ? ??http://semiconductormuseum.com/Museum_Index.htm " Since its initial product launch by Motorola at the 1962 IRE Convention, the 2N2222 has become the most
By Jerry Gaffke · #51540 ·