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Re: Help aligning VFO (Ozark Patrol regen)
Yes, that's what mine does, as I wrote (not swapped). Steve
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Steve Ratzlaff
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#9226
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Re: Help aligning VFO (Ozark Patrol regen)
Are you sure the 5.24 and 5.46 aren't swapped? I calculated that the minimum capacitance of the circuit is -78 pF... [email protected]> wrote:
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Ross Tucker (NS7F)
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#9225
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Re: Adding to the KN5L ft test fixture.
https://techlib.com/newprojects.htm???? (And I misspelled his name, it's Wenzel.)?? You need an RF source such as the popular function generators/AWGs, some go past 30 MHz. His tester takes the
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Steve Ratzlaff
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#9224
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Re: Help aligning VFO
QSL I was merely addressing your earlier stated requirements. Obvious to reduce the upper range a smaller range variable cap is needed. Then as you or others describe, a band switch with different
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Curt
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#9223
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Re: Adding to the KN5L ft test fixture.
Ok, I give up. It is easy to do a relative measurement of Ft, i.e. compare 2 transistors. But I can not yet achieve the absolute accuracy using my setup. First, the diode detector is non-linear at low
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vbifyz
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#9222
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Re: Help aligning VFO (Ozark Patrol regen)
Fascinating! I guess build-and-measure really is the way to go. I'll try watching the oscillator on our scope this week. [email protected]> wrote:
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Ross Tucker (NS7F)
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#9221
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Re: Help aligning VFO
The OP has one particular advantage. My university bought three kits for student projects, so they are effectively free. My ham radio mentees are generally not able to spend $125 for a Bayou Jumper at
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Ross Tucker (NS7F)
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#9220
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Re: Help aligning VFO
Ross Build and see what you get. My own experience with the OP is that it's an exceptional AM signal receiver. At least one builder has added medium wave broadcast band reception. I imagine the
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Curt
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#9219
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Re: Help aligning VFO (Ozark Patrol regen)
I picked a random? T50-2 toroid out of the bag and wound 20 turns #26 with about 3/16" spacing on the ends. On the DE-5000 at 100 kHz test it measures even higher than toroids.info predicts--2.175
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Steve Ratzlaff
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#9218
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Re: Solder expring
For a business, sure makes perfect sense. I agree. For us hobbyist, does not matter. Can't tell the difference between what I recently bought new or the stuff that is many decades old. You think my
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Richard AG5M
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#9217
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Re: Help aligning VFO (Ozark Patrol regen)
Hi Ross, My experience with all iron powder toroids is there are always variations from toroid batch to batch, and actual? inductance can vary quite a bit--one measures the final inductance and
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Steve Ratzlaff
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#9216
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Re: Solder expring
I think it would be for liability reasons. A company that experiences a catastrophic disaster will endure investigations and inquires on their practices. Even if there's no evidence solder is degraded
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Jon Edwards
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#9215
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Re: Help aligning VFO (Ozark Patrol regen)
Thanks for the feedback! Also, btw: the schematic says L1 is 1.5 uH but 20 turns on a T50-2 is supposed to be 1.96 uH. Any thoughts on that? [email protected]> wrote:
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Ross Tucker (NS7F)
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#9214
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Re: The end of inexpensive printed circuit boards and parts
For those who consider just about any conversation as "political" -- I wasn't giving any political views. I was keeping it politically neutral. Not that I have to ask anyone's permission, however. We
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Matthew McDevitt N3AZ
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#9213
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Re: QSL cards
Haha, that's great Hamilton! Yes, I remember that QSO. Got you in the log here. I had been wanting to work you for a while, ever since I read about the Toucans project (on the Soldersmoke blog, at
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Dave AA7EE
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#9212
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Re: Help aligning VFO (Ozark Patrol regen)
Hi Ross, On mine, the Low band tunes 3.90-5.24 MHz; High band tunes 5.46-- ~19 MHz, as you note at least the High band is very wide tuning. Your scheme would probably work but I predict it will take a
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Steve Ratzlaff
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#9211
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Re: Solder expring
Well... I have been licensed for 62 years now, and have lots of old rolls of 60/40 solder going back many decades. As far as I can tell none of it has gone bad, it all still works just fine. Just used
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Richard AG5M
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#9210
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Re: The end of inexpensive printed circuit boards and parts
I would like to add a couple of thoughts: 1. Yes, this is pretty horrible. We can't buy critical equipment, parts, tools, etc. which (let's face it) are made in China. Such is the reality in 2025. A
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Matthew McDevitt N3AZ
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#9209
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Re: QSL cards
Here's what I was talking about re the tradition of QSLing.. https://youtu.be/rYNPBiaTh2Y?feature=shared -- William, k6whp -------------------- "Cheer up, things could get worse. So I cheered up and
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k6whp
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#9208
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Re: QSL cards
General info... The Avery 5689 110# laser cut postcard stock is available on Amazon at $17 for 200 cards. (50 8x11 sheets.) Also, Avery has downloadable templates for Word and those are usable by
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k6whp
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#9207
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