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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
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Elia DL1YE
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#9565
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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
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Dave AA7EE
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#9564
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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
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Steve Ratzlaff
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#9563
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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
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Curt
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#9562
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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
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Pete WB9FLW
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#9561
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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
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ajparent1/kb1gmx
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#9560
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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
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Daniel KK4MRN
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#9559
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Re: RF Power Transistors (2SC2078 used by Rick Choy in Midway Electronics kits)
Hi Rick, OK, I'll call your bluff.?? :)???? I have your ME20? I built but it has a 2SC2166 in it which I won't pull and test (which you didn't mention using), but your ME40? I built has the
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Steve Ratzlaff
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#9558
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Re: RF Power Transistors (2SC2078)
I use the 2078 in my QRP kits I sell at Midway Electronics. The ME40, ME80, ME30, and ME20. I get all mine from ebay sellers. They are name branded but that doesn't mean anything. I individually test
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R. Choy
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#9557
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Re: RF Power Transistors (2SC2078)
As of a few minutes before 10pm Pacific Time, he has now sold 55 and has 45 left. I wonder how many of those sales were as a result of Steve's posts in this group? I wouldn't be surprised if it was
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Dave AA7EE
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#9556
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Re: Benchtop DMM Recommendation
Thanks for the recommendations. It looks like either of those would be a great instrument to have on the bench. I have been watching some reviews and will likely make my choice in a day or two. 73 ,
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W0PWE
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#9555
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Re: RF Power Transistors (2SC2078)
The seller of the good 2SC2078's I tested shows 80 of them now available--his new shipment of them must have arrived. He's raised the price slightly to $2.10/each.
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Steve Ratzlaff
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#9554
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60 meter homebrew rig: TX amplification demo
I made a video short on youtube for a part of of my? proposed 60 meter transceiver. The video shows the TX power amplifier and small signal amplifier boards working together under test. Please note,
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hwstar
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#9553
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Re: RF Power Transistors
Curt, I have been a ham since 1960 and recently met and friended an 86 year old gentleman who became a ham just 3 years ago. We are having a ball. He just discovered the Morserino and convinced his
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David Wilcox K8WPE
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#9552
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Re: RF Power Transistors
Dave A ham license is indeed a life-long learners permit. Glad for all your learning and extensive sharing with us. Our community is so strong because of so many folk sharing their experience. Of
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Curt
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#9551
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Re: Benchtop DMM Recommendation
If you are ok with 50MHz scope bandwidth (more like 30MHz in reality), you can go even lower in price: https://www.amazon.com/s?k=zoyi+zt-703s It works fine as a DMM. I have an HP34401A to compare it
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vbifyz
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#9550
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Re: Benchtop DMM Recommendation
Wow. Didn't know these devices existed. Nifty! --Kirk, NT0Z My book, "Stealth Amateur Radio," is now available from www.stealthamateur.com and on the Amazon Kindle (soon)
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Kirk Kleinschmidt, NT0Z
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#9549
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Re: Benchtop DMM Recommendation
I am using this. It¡¯s a 3 in 1 device, scope, dvm and signal generator. For the price it is plenty. https://a.co/d/aZFcppF -- 73 Barb WB2CBA
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Barb WB2CBA
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#9548
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Re: Which frequency governs the Si5351 initial phase offset calculation?
Let's try to analyze the clock path to find the answer. Assuming 2 outputs (CLK0 and CLK1) use the same VCO. The first block after the VCO (not really, but this makes the analysis easier) is the phase
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vbifyz
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#9547
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Edited
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Which frequency governs the Si5351 initial phase offset calculation?
Hello fellow QRP enthusiasts, I know this topic has been discussed here before? but I'm still a little confused as to which frequency / timebase is used to compute the value of the initial phase
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Elia DL1YE
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#9546
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