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Re: 7 MHz Oscillator Ideas
Thanks Jerry, that helps quite a bit. I may change out t a different BPF design as I have no strong signals of any kind near me. I live out in the middle of the woods and don't have any neighbors.
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JT Croteau <jt.tobit@...>
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#355
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Re: 7 MHz Oscillator Ideas
Correction: freq = 1/(2*pi*sqrt(L*C)) So doubling both L and C with cut the frequency in half. Not to a quarter of the original frequency.
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Jerry Gaffke
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#354
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Re: 7 MHz Oscillator Ideas
The HiPerMite has no volume control: http://www.4sqrp.com/hipermite.php And this radio has no AGC. So AA7EE's 1k pot is also your only volume control. Jerry
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Jerry Gaffke
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#353
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Re: 7 MHz Oscillator Ideas
That AA7EE front end is fairly straightforward. The 1k pot is for RF gain in case you are dealing with very strong in-band signal, the SA612 doesn't have a whole lot of dynamic range. The tuned
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Jerry Gaffke
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#352
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Re: 7 MHz Oscillator Ideas
I've been thinking of taking AA7EE's approach at using NM0S's HiPerMite as the audio chain. I don't fully understand his use of a tuned BPF, my lack of experience is showing here. AA7EE Rugster:
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JT Croteau <jt.tobit@...>
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#351
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Re: 7 MHz Oscillator Ideas
I used a 7.16 mHz ceramic resonator with great success. http://www.learnmorsecode.com/DC/index.html I had those resonators left over from the VK3YE regen projects.
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Rob <roomberg@...>
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#350
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Re: 7 MHz Oscillator Ideas - good enough
JT, This is exactly how I used my old Ramsey kit back in the early '90s.? Had it next to my bed. It was the same NE602/LM386 design. An LC osc using the NE602 internal should work fine. A varicap
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wb6ogd
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#349
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Re: 7 MHz Oscillator Ideas
I like the receiver section of the SST xcvr for an application like this. It even has a simple AGC that works pretty well. You will probably need another stage of audio amplification if you want to
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W0PWE
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#348
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Re: K1SWL has done it again, the Phaser!
Dave has posted on the CWTD Group his thoughts on using a DC Receiver with the Phaser Transceiver: "We considered interoperability between Phaser users to be an important design goal.?? That drove
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Pete WB9FLW
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#347
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Re: 7 MHz Oscillator Ideas - good enough
Hi Bill, CW only. I just want something to monitor 7030 and 7040 while I am smoking a pipe and reading in my single room cabin or drifting off to sleep. 73
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JT Croteau <jt.tobit@...>
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#346
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Re: 7 MHz Oscillator Ideas - good enough
Hi JT, What modes do you have in mind? CW and most of the digital modes are not particularly fussy about a little drift. A free running, L-C VFO should give you what you *need*. The ones I have that
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Bill Cromwell
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#345
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7 MHz Oscillator Ideas
Hi folks, I'd like to build a simple NE612/LM386 receiver to cover from roughly 7.028 to 7.042. I'm wondering what I should use for the oscillator. I've been poking around on google but it is making
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JT Croteau <jt.tobit@...>
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#344
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Using Re-Purposing those Flat Mobile Phone Cells
From old mobile phones, I've saved several sizes of various AHr capacity cells. If you don't have a way to make compression contact to the terminals on the top, you can solder to them. The terminals
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Chuck Carpenter
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#343
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Re: K1SWL has done it again, the Phaser!
Very similar to the PSKs. When I first worked JT65, I considered converting my PSK-20 to JT65. In the end, I couldn't bear to cut up such neat little rig. I'm glad I didn't. JT modes remind me of
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Eric KE6US <eric.csuf@...>
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#342
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Re: K1SWL has done it again, the Phaser!
Thanks Ryan, I missed your write up. I'm hoping it will not be too difficult to modify one for 160M.
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JT Croteau <jt.tobit@...>
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#341
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Re: K1SWL has done it again, the Phaser!
I wrote this transceiver up on my website if anyone cares for an analysis: https://miscdotgeek.com/the-phaser-a-digital-only-qrp-radio-kit/ TL;DR: It's SSB transmit, DSB receive. -- Ryan Flowers W7RLF
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Ryan Flowers
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#340
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K1SWL has done it again, the Phaser!
Just like the Warbler and PSK series of days long ago, K1SWL has done it again by teaming up with N2APB to produce a phasing SSB QRP transceiver for FT8 and other digital modes. With two frequencies
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JT Croteau <jt.tobit@...>
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#339
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Re: NP0 Capacitors for QRP homebrew
Easy enough. Let's expand that range to all values from 0.0000001 F to 100000 pF. What more could you want?? ?;-) Jerry, KE7ER
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Jerry Gaffke
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#338
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Re: NP0 Capacitors for QRP homebrew
Heh yeah, they are just listing then numerically rather than by capacitance. Kind of silly, but there's a good variance in the capacitors themselves. Ryan Flowers
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Ryan Flowers
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#337
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Re: NP0 Capacitors for QRP homebrew
I got an email from Amazon a couple days ago offering a capacitor assortment from 0.1 uF to 100 nF. Could we expand that range a little? 73- Nick, WA5BDU [email protected]> wrote:
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Nick Kennedy
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#336
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