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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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Re: Low Band QRP
It was the Fort Tuthill 80, known also as the Tut80. It's a nice little rig. I modified mine for varactor tuning with a 10-turn pot (suggested by Cam N6GA) and a KD1JV Digital Dial, as well as modding
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Dave AA7EE
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#9545
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Re: Low Band QRP
Kirk Wow, you've really done well.? My annual forays on 160 can be counted on one hand.? I'm not much of a contester and I don't chase various awards.....but I've found the Stew Perry event much to
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Gerald Wolczanski
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#9544
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Re: Low Band QRP
@ KI4IO:? Yes, agree 100% that on 160, it's all about the antenna. But I think your particular inverted-L is a bit higher up in the ranks than you might think. In 2017/2018, when the ionosphere was
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Kirk Kleinschmidt, NT0Z
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#9543
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Re: NC40A ON 160
Howard, Though the thought of building an "NC160A" would be poo-pooed in some quarters, because I needed an excuse to warm up my iron, I purchased a 160m 1Watter from Diz, and it resulted in a nice
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k6whp
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#9542
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Re: Low Band QRP
The price of admission for 160 is an efficient antenna.? I'm probably at the low end with a 165' inverted-L up 75' with 47 mixed length radials from 15 to 70'.? I use a K2 at 5 Watts. I like the
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Gerald Wolczanski
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#9541
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Low Band QRP
As AA7FO mentioned this matter, here is what I can share. On 160m I have had several CW QSOs with folk operating simple tube transmitters at 5 to 10 watts. ?So it¡¯s definitely viable during the
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Curt
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#9540
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