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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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Re: Is there an easy way to test sa612 smd chips
Measure 1500 ohms across the input pins (1 and 2) 73 Mike M. KU4QO [email protected]> wrote:
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Michael Maiorana
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#9631
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Re: Is there an easy way to test sa612 smd chips
The early NC40B kit 612s had some defective ones. An easy check we found is ohmmeter across pins 1 and 2. Good ones are in the 10-50 kohm range,? bad ones are open or much higher or much lower. Steve
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Steve Ratzlaff
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#9630
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Is there an easy way to test sa612 smd chips
Is there an easy way to test smd soic8 packaged sa612 chips?? Doug
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Doug Hendricks
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#9629
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Re: Size of SST
Kirk, Don't laugh. I used to work the flightline at the annual airshows at Oshkosh, WI. Was there the first time they flew the Concorde SST in and was the one who marshalled it to a stop before it was
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Walter Thomas/K3ASW
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#9628
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Re: Size of SST
Thank you Walt, it's been along time.? Doug
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Doug Hendricks
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#9627
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Re: Size of SST
As I recall, the SST was 202 feet long with a wingspan of 84 feet. Not QRP in any way! Sorry. Couldn't resist.? :) Regards, Kirk, NT0Z My book, "Stealth Amateur Radio," is now available from
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Kirk Kleinschmidt, NT0Z
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#9626
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Re: Size of SST
Doug, SST actual measured dimensions: Board: 3.0" w x 3.5"d Case: 3.415" w x 3.75" d x 1.510" h; case and front and rear thickness = 0.050". excludes rubber bumpers and control and connector
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Walter Thomas/K3ASW
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#9625
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