Feel free to add information to the wiki or make edits as needed. Please respect the work of others by adding your own content rather than editing or removing someone else's content unless doing things like updating URL's etc.?
|
Re: NorCal40A ferrite on Q6
Hi Roy, My experiences building several buffer, driver and PA sections for tests indicate no FB is needed; none of mine used a FB, and worked fine. I would suggest though that -43 or -31 FB is too
By
Steve Ratzlaff
·
#9578
·
|
|
NorCal40A ferrite on Q6
The original Wilderness Radio manual calls for a ferrite bead Z1 on the base of transistor Q6 in the driver. ?The ferrite is specified as #64 material. I¡¯m having a hard time sourcing a small bead
By
Roy WN3F
·
#9577
·
|
|
Re: Looking for NorCal 40A Rev 2.0 board or two
Dan, I¡¯ll put ¡®em in the mail in next couple of days. I¡¯ll send it to your QRZ address unless you tell me otherwise. Don, K5DW
By
Don K5DW
·
#9576
·
|
|
Re: Looking for NorCal 40A Rev 2.0 board or two
One would be great, two would be outstanding! Reading through the "Reworking the NorCal 40A" story in files section, it wouldn't hurt to have a spare. -Dan W3SLD
By
Dan W3SLD
·
#9575
·
|
|
Re: 2SC2078
I've mentioned this before, but please do not expect quick shipping.? The seller told me he's almost always on business trips M-F and doesn't get home to process orders until the weekend. Steve AA7U
By
Steve Ratzlaff
·
#9574
·
|
|
2SC2078
The Las Vegas seller of good 2SC2078's showed sold out over the weekend, but a check this morning shows 15 available at $2.10 each.?? https://www.ebay.com/itm/286546961462 I've tested ten of them
By
Steve Ratzlaff
·
#9573
·
|
|
Re: Looking for NorCal 40A Rev 2.0 board or two
?Dan, If you still need it, I¡¯ve got one I can send you. Maybe two, I¡¯ll have look. Don, K5DW
By
Don K5DW
·
#9572
·
|
|
Looking for NorCal 40A Rev 2.0 board or two
Hello everyone! I'm looking to build the NorCal 40A, I was wondering if anybody has a couple unpopulated boards they would like to part with. I see the gerbers in the Files section (QRP Tech NC40A
By
Dan W3SLD
·
#9571
·
|
|
Re: Low Band QRP
@KI4IO: For the little guy, contesting seems to be the great equalizer if you can't operate a LOT or you don't already have a powerhouse station. During contests, the other op's super station is
By
Kirk Kleinschmidt, NT0Z
·
#9570
·
|
|
Re: HA8SA All Band CW QRPp DC Transceiver
Thanks for sharing the details Pete. The ESP32 platform is by far my homebrewing favorite these days for price, power and flexibility; from the Xiou -S3, to the D1-Mini and the DevKit like this one.
By
George N2APB
·
#9569
·
|
|
Re: HA8SA All Band CW QRPp DC Transceiver
That's an interesting design. The TX/RX switching is clever. Did you build it, Pete? 73 Mike M. KU4QO [email protected]> wrote:
By
Michael Maiorana
·
#9568
·
|
|
Re: Which frequency governs the Si5351 initial phase offset calculation?
Hi Elia! where is the phase offset added to the signal? Before the R divider or Conceptually, think of the 2nd multisynth dividers as counters that can be initialised with a certain start value that
By
Guido PE1NNZ
·
#9567
·
|
|
RF Power Transistors (2SD882, 2SC5706) more tests
I did more tests with both transistors today, adding 30M and 20M. Same setup as before, switching to the output transformer for the 4 and 5 watt tests, but then I thought why not check at the 3 watt
By
Steve Ratzlaff
·
#9566
·
|
|
Re: Which frequency governs the Si5351 initial phase offset calculation?
Mike, sorry for the late reply, I'm rather busy at work at the moment. Thank you for confirming that it is the combined divider ratio from VCO frequency to output frequency that determines the
By
Elia DL1YE
·
#9565
·
|
|
Re: RF Power Transistors (2SD882, 2SC5706)
Thanks Steve. That's particularly good news about the 2SD882's from Tayda - especially for transistors that only cost 14 cents apiece. I recently received delivery of 10 of them. Will need to add a
By
Dave AA7EE
·
#9564
·
|
|
RF Power Transistors (2SD882, 2SC5706)
Here are some test results I did with the 2SD882 (from Tayda), and the 2SC5706 (from kitsandparts.com) on 40M. I used 12.8 V supply, and the Norcal 40A buffer, driver and power amp circuit with a 40M
By
Steve Ratzlaff
·
#9563
·
|
|
Re: RF Power Transistors
Thanks Allison for explanation. I had heard that small signal characteristics were same, so that explains it. Before the internet I recall an engineer asking a colleague for a PNP complement to a
By
Curt
·
#9562
·
|
|
HA8SA All Band CW QRPp DC Transceiver
"A very simple direct conversion HF CW transceiver. It works on any band just need to replace LPF circuit or use a 30 MHz LPF and external tuner. On 40m I've had 17 DXCC on Europe. I had only 225 mW
By
Pete WB9FLW
·
#9561
·
|
|
Re: RF Power Transistors
note the 2n2219A is the TO5 can version but the same die as 2n2222A. The difference is more power better cooling with heatsink. I use a lot of the 2n2222A (aka the roach) as its one of the oldest
By
ajparent1/kb1gmx <kb1gmx@...>
·
#9560
·
|
|
Re: RF Power Transistors (2SC2078 used by Rick Choy in Midway Electronics kits)
Hello, Looking at my ME40+ kit instructions.? It says it can be either a 2SC2078 or 2SC2166. Mine is a C2078.? I already have a transistor tester, but I have seen some home brew tools posted on here
By
Daniel KK4MRN
·
#9559
·
|