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Re: Crystal Searching
Thanks for posting this info Chuck. I want to build a 20M SST so I am thinking of going with your VXO/IF scheme of 10MHz/4.032MHz What are the advantages of using HC-49S, HC-49U or HC-49UX crystal
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Alan N8WQ
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#9651
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Re: Accurate way to measure RF power??
All, I am making my measurements at 14.050 MHz. I recognize this is a QRP site, but I'm trying to measure a wide range of power: mW to 100+W. The measurements I've made so far have all been terminated
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Bill
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#9650
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Re: Is there an easy way to test sa612 smd chips
I found three different types of DIP 602s in my stash.? Signetics SA602N, 1989 date code, 22.3 kohms; Philips SA602AN, can't decipher date, 11.2 kohms; NXP NE602AN, can't decipher date, 11.5 kohms. I
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Steve Ratzlaff
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#9649
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Re: QRP power measurement and AA7FO lab and web report[long]
Hey you were the guy advocating that a vxo offers enough tuning span (-: The pll does add complexity needing microcontroller and display. Enough to warrant getting a qcx mini instead. I recall
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Curt
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#9648
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Crystal Searching
Gang, For those that haven't stocked up over the years on crystal deals or renewing their stock like I am, here is a list for you to go through at your time of choice.? If you are interested, I'd
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chuck adams
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#9647
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QRP power measurement and AA7FO lab and web report[long]
QRP Power: See <https://qrpguys.com/12w-dummy-load-power-meter> manual for how it is done with a dummy load.? Unfortunately QRPGuys are shut down for a month due to traveling on vacation. The power
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chuck adams
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#9646
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Re: Accurate way to measure RF power??
Hello Bill, I almost did not want to respond because I consider myself a "novice" still around all these experts.? But I decided to write anyways.? Just consider what I say with a grain of salt. I
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Daniel KK4MRN
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#9645
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Re: Is there an easy way to test sa612 smd chips
I have a number of SMD Signetics SA602A's. I don't want to remove them from the roll, but I do have one free one and one single solitary 8 pin DIP one. The SMD one measures 11.75K DC resistance across
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Dave AA7EE
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#9644
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Re: Accurate way to measure RF power??
What type of scope do you have? I have a new Hantek and older Tektronik scopes and both are accurate for the HF bands. I like to use a scope because you can measure SSB PEP power. The issue I have
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Mike N2MS
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#9643
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Re: uP40 Transceiver
Nice - - so how's the opposite side-band rejection? KI4IO Jerry W Warrenton, VA
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Gerald Wolczanski
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#9642
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Re: Accurate way to measure RF power??
Hi Bill, You didn't tell us what frequency range you were trying to measure, and what power range.? ?This can make a difference in how you can measure accurately.? ?Also, are you trying to measure
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James Amos
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#9641
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Re: Accurate way to measure RF power??
Bill I am surprised with scope probe inconsistency and don't know them well enough to comment. Maybe they are optimal at different frequencies. I built a diode sensor per W7ZOI instructions. It was
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Curt
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#9640
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Accurate way to measure RF power??
All, Would a simple diode detector be a (relatively) accurate way to measure RF power? I suspect my o'scope is reading RF incorrectly.? I have 4 different x10 probes and with each one I get
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Bill
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#9639
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uP40 Transceiver
Hi Everyone I've been working on a new transceiver project. I was so pleased with the uPDCR (a small phasing receiver with AI voice) that I thought it would be fun to turn it into a transceiver. So
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vk7ian@...
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#9638
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Edited
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2SC2078 again
The Las Vegas seller of the good 2SC2078 I've tested shows 25 available again, if anyone has not yet stocked up on them--and the price is the same $2.10 each.??? :)
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Steve Ratzlaff
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#9637
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Re: Is there an easy way to test sa612 smd chips
Thanks Steve.? Great to know.? ?Simple and easy.? ?I appreciate your knowledge.? ?Doug
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Doug Hendricks
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#9636
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Re: Is there an easy way to test sa612 smd chips
I found this at Adafruit.com as a soic-8 ic socket but i am thinking of using as a tester. but this item only works for a size of 200... who knew there are different sizes of soic-8 ICs?
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Daniel KK4MRN
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#9635
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Re: Is there an easy way to test sa612 smd chips
Steve, Yep, you are correct. I guess I lost that memory somewhere. Sorry for the misinformation. Mike M. KU4QO [email protected]> wrote:
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Michael Maiorana
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#9634
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Re: Is there an easy way to test sa612 smd chips
I tested 7 SMD "NXP" marked 612's just now (old Fluke DMM set to 200 kohm scale): ohmmeter reading across pins 1 and 2:? 11.1k; 11.6k; 11.4k; 11.0k; 11.3k; 11.3k; 11.5k ohms. Steve
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Steve Ratzlaff
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#9633
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Re: Is there an easy way to test sa612 smd chips
Sorry, Mike, that is not correct. That's the input impedance at RF, not the DC ohmmage. The info I gave is correct. Steve
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Steve Ratzlaff
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#9632
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