[Lowfer] Lowfer KE
jrusgrove at comcast.net
jrusgrove at comcast.net
Tue Nov 24 10:33:31 EST 2020
Kasey
Package going out today includes 27 pF and all parts to make a 0-200 mA rf ammeter. Do you need
anything else before I pack it up?
Jay
----- Original Message -----
From: "KA4SEY" <ka4sey at gmail.com>
To: "Discussion of the Lowfer (US, European, & UK) and MedFer bands" <lowfer at mailman.qth.net>
Sent: Tuesday, November 24, 2020 9:22 AM
Subject: Re: [Lowfer] Lowfer KE
> Yes, the PO box is good.KaseySent from my Verizon, Samsung Galaxy smartphone
> -------- Original message --------From: jrusgrove at comcast.net Date: 11/24/20 9:17 AM (GMT-05:00)
> To: "Discussion of the Lowfer (US, European, & UK) and MedFer bands" <lowfer at mailman.qth.net>
> Subject: Re: [Lowfer] Lowfer KE KaseyIs your address good on QRZ.com? Jay W1VD----- Original
> Message -----From: KA4SEY <ka4sey at gmail.com>Reply-To: Discussion of the Lowfer (US, European, &
> UK) and MedFer bands <lowfer at mailman.qth.net>To: Discussion of the Lowfer (US, European, & UK) and
> MedFer bands <lowfer at mailman.qth.net>Sent: 11/23/2020 8:13:23 AMSubject: Re: [Lowfer] Lowfer
> KE________________________________________________________________________________Jay,If you would
> mind, I think all the trouble I've got with the transmitter it would definitely help to have those
> parts. I'm sure I can build that meter no problem. KE will be off the air for a few days because
> I'm having issues with the chips so I can be working in that while the parts ship. Thanks
> againKaseySent from my Verizon, Samsung Galaxy smartphone-------- Original message --------From:
> jrusgrove at comcast.net Date: 11/23/20 6:03 AM (GMT-05:00) To: "Discussion of the Lowfer (US,
> European, & UK) and MedFer bands" <lowfer at mailman.qth.net> Subject: Re: [Lowfer] Lowfer KE
> KaseyUnfortunately, the low range RF ammeter is no longer in the meter box ... I must have already
> given it away. The next bigger one I have is 1.5 amp full scale ... which wouldn't be suitable.
> These meters are highly non linear ... the first mark up on the scale is 0.5 amp so there's no
> chance you could see enough of an indication to work with.I do have the 27 pF silver mica caps and
> some parts for a homebrew rf ammeter if you need them.Jay W1VD ----- Original Message -----From:
> KA4SEY <ka4sey at gmail.com>Reply-To: Discussion of the Lowfer (US, European, & UK) and MedFer bands
> <lowfer at mailman.qth.net>To: Discussion of the Lowfer (US, European, & UK) and MedFer bands
> <lowfer at mailman.qth.net>Sent: 11/22/2020 9:33:30 AMSubject: Re: [Lowfer] Lowfer KE_______
> _________________________________________________________________________Yea if you wouldn't mind,
> I really appreciate that. I believe you said you had the ammeter as well? If you dont mind I think
> it could use it now that I've thought about it. It should really help me the most. For any other
> information please let me know. Thanks againKaseySent from my Verizon, Samsung Galaxy
> smartphone-------- Original message --------From: jrusgrove at comcast.net Date: 11/22/20 7:13 AM
> (GMT-05:00) To: "Discussion of the Lowfer (US, European, & UK) and MedFer bands"
> <lowfer at mailman.qth.net> Subject: Re: [Lowfer] Lowfer KE KaseyCan drop a couple 27 pF silver mica
> caps in the mail ... along with the resistors. Just say the word.Jay W1VD----- Original
> Message -----From: J D <listread at lwca.org>Reply-To: Discussion of the Lowfer (US, European, & UK)
> and MedFer bands <lowfer at mailman.qth.net>To: <lowfer at mailman.qth.net>Sent: 11/22/2020 2:26:24
> AMSubject: Re: [Lowfer] Lowfer KE___________________
> _____________________________________________________________Kasey, it would appear from your
> schematic that a few components may be missing, thereby preventing your oscillator from being as
> stable as it needs to be. This same situation is found in a commercially made sorta-kit rig for 22
> meters, and beacons using it there can often be identified by their tendency to wander or even
> outright jump around in frequency from day to day.A Pierce oscillator needs capacitance from both
> legs of the crystal to ground as part of a phase shift network. There is stray capacitance
> present, of course, without which it would not oscillate at all; but that is neither of sufficient
> magnitude nor stability to ensure reliable oscillation at the design frequency of the crystal. A
> good starting value for capacitors for a typical 3 MHz parallel resonant crystal would be 27 pF
> each.In addition, there needs to be a series resistor between pin 10 and the crystal. It serves
> three functions that each a ffect frequency stability to a certain extent: it isolates the crystal
> somewhat from the complex impedance of the gate output, it limits current and thereby power
> dissipation in the crystal, and it is part of the phase delay network. As a rough first
> approximation, I'd suggest 1 K, maybe as high as 2.2 K.Finally, the shunt resistance across the
> crystal could be a little higher in value for 3 MHz operation, such as 3.3 M to 4.7 M. It's not
> terribly critical, but it is preferable to operate it with as high a value as will allow for
> reliable startup. Lowering the operating Q of the crystal with a low parallel resistance could
> allow a crystal to jump too easily between primary resonance and any secondary resonance modes it
> may have.These comments are some basic rule of thumb guidance. For more detailed treatment of
> Pierce oscillators implemented with logic gates, I believe Crystek still offers this
> article:https://www.crystek.com/documents/appnotes/pierce-gateintroduction.pdfJo hn
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