Re: [Elecraft] A dumb question about lightning

2023-07-31 Thread Geoffrey Feldman
First thing and foremost - switches are mostly not relevant to protection. Energy that can travel 1000' through the sky is likely to continue across most switches. So, the utmost of safety is what you indicated you did - disconnect. By disconnect, I mean either disconnect outside the

[Elecraft] Calibration of KX3 may not be necessary

2023-06-20 Thread Geoffrey Feldman
Send email to supp...@elecraft.com with the serial number of your rig (either the sticker on the back or displayed in the rigs parameters) and request the original configuration file. Whether your kX3 was a kit build or assembled, it was calibrated with the original configuration file kept by

[Elecraft] Mag loops and KX3 tuning

2023-02-07 Thread Geoffrey Feldman
Do not use the KX3 tuner when using a mag loop. Set the tuner to bypass. A mag loop is the tuner. In order to gain resonance, adjust the mag loop's capacitor to hear maximum noise at the frequency you want to start working. Mag loops are high Q, resonant in a very narrow range of frequencies.

Re: [Elecraft] Elecraft Digest, Vol 225, Issue 9

2023-01-24 Thread Geoffrey Feldman
Correction - could be 3R3 - that's an inductor. W1GCF Geoff -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of elecraft-requ...@mailman.qth.net Sent: Tuesday, January 24, 2023 12:42 PM To: elecraft@mailman.qth.net Subject:

Re: [Elecraft] Elecraft Digest, Vol 225, Issue 9

2023-01-24 Thread Geoffrey Feldman
There are very few reasons to have 3.3 Ohm resistor anywhere. It's much more likely to have a 3.3 K Ohm resistor. This it is likely labeled 3K3 not 3R3. There is a saying that if you hear hoof beats, think horses not zebras. Going with horses, you are looking in the schematics for a 3.3 K ohm

Re: [Elecraft] KX3 and its "TUNE" selection. (With mag loop)

2022-08-24 Thread Geoffrey Feldman
to? That could operationally be simpler than having to hit it with low-power RF so it can tune itself... - Jerry, KF6VB On 2022-08-23 14:28, Geoffrey Feldman wrote: > If your antenna is a magloop - DO NOT USE the tune button. In fact, > clear > the tuner

[Elecraft] KX3 and its "TUNE" selection. (With mag loop)

2022-08-23 Thread Geoffrey Feldman
If your antenna is a magloop - DO NOT USE the tune button. In fact, clear the tuner memory for your band per instructions. The tuner feature (assuming you have the option) is great with other antennas, especially random wire but it doesn't go well with mag loops. The xmit button is simply

Re: [Elecraft] COM port problems

2022-07-01 Thread Geoffrey Feldman
These is nothing unique about the Elecraft serial cable except possibly the radio side connector. Basically it's a USB to RS232 Ground/transmit/Receive cable. Anyone who understands USB com ports can help you. They don't need to know radio. They should understand what I wrote here. For USB COM

[Elecraft] KX3 Really works and made me happy

2022-05-15 Thread Geoffrey Feldman
I made a confirmed contact 1:52Z April 15 with LZ2A0 in northeastern Bulgaria 4607 miles from my QTH using my KX3, a Bioenno battery, and an Alexloop antenna. All this inside my house in Lowell MA USA, not even by a window. The contact was so good we had a brief conversation about my rig and

[Elecraft] KX3 Option advice wanted.

2022-05-02 Thread Geoffrey Feldman
The really short answer is "all of them" and even more so if you are buying it factory assembled and tested. This is such a versatile rig, you will find something to do with every option. I got mine fully loaded except for the 2M transverter. The reason I didn't was that I already had an HT at

[Elecraft] Elecraft is so awesome all we got is RPN to talk about

2022-02-04 Thread Geoffrey Feldman
I love RPN calculators and even better faithful emulation of them. Those of us who like to compare their favorite smart phone apps for a 50 year old calculator architecture area fellowship of wise and good people. Love it. What is even better is the obvious lack of issues with Elecraft products

[Elecraft] RPN Calc App For Android

2022-01-28 Thread Geoffrey Feldman
I almost hesitate to weigh in since so many others have. The HP41 app is actually an emulator which runs the actual firmware from the original calculator. If you have HP41 programs you like and don't feel like porting them, this is the best going. However, I like "Free42" which is a complete

[Elecraft] Regarding KX3 power

2021-10-10 Thread Geoffrey Feldman
Understand you don't want an amplifier, go QRP. Nothing wrong with the switcher or with the Pro Audio. What I am happy with is the BioEnno is the BioEnno 123AH battery. It's small enough to fit into the "shack in the pack" or something similar in size. LiFePo batteries such as this one can

Re: [Elecraft] KX-3 won't turn on with batteries

2021-09-23 Thread Geoffrey Feldman
Send a picture of the batteries installed. With regard to the charging the Eneloop's, they come fully charged and thus setting up to charge them might deliver an error. One other possibility, what is the minimum operating voltage (Bat min) in the menu is set to? Try something like 9v.

[Elecraft] SDR Technology

2021-07-03 Thread Geoffrey Feldman
Hi Walter, In response to your comments on my post, the terminology you use and that I used both appear in various texts to describe the same thing. Not surprising, we both know what one another mean. I prefer incident because quadrature is in relationship to that. An AM signal would appear on

[Elecraft] SDR Filter improvement

2021-07-03 Thread Geoffrey Feldman
My career has been in software/hardware systems including some with signal processing. Digital filters ultimately embody mathematical equations which operate on a matrix of samples represented as complex numbers. IQ stands for incident and quadrature, sine and cosine, real and imaginary or x and

[Elecraft] Generic words on temperature

2021-06-30 Thread Geoffrey Feldman
My rule of thumb is that if you can keep your finger on it for a second or so without pain, it's not too hot. The ambient temperature is really not the issue as much as whether heat is carried off. I know it's hot in the pacific northwest but I think you can still enjoy your gear. The

[Elecraft] Are there any "bad radios"?

2021-06-13 Thread Geoffrey Feldman
Having worked retailing amateur radios, people often ask which is best. Also often they are absolutely convinced they know the answer because their Elmer said so. When I review what someone actually wants to do with the hobby and get a sense of their budget, I can advise them. A new Ham often

[Elecraft] Absurd remarks about FCC and ARRL notices.

2021-01-18 Thread Geoffrey Feldman
. Interesting to know the false sympathies of some of you though. I encourage you to spend the reasonable efforts of citizens to go and learn what you didn't. Geoffrey Feldman W1GCF __ Elecraft mailing list Home: http://mailman.qth.net

[Elecraft] KX2 External battery question:

2020-11-06 Thread Geoffrey Feldman
No - the KXBC2 is not suitable for the Bioenno BLF-1203W, you should use the charger sold by Bioenno for this purpose. Bioenno products are LiFePo, a different kind of LiOn Chemistry than the Elecraft ones. The Bioenno charger will work for all the higher AH batteries they sell that have the DC

[Elecraft] Smoke Detectors

2020-10-28 Thread Geoffrey Feldman
Radio waves are non-Ionizing. I hope we all know that and know one another know that. However the near field is an electrical field. The smoke detector compares the ionization between two chambers, both with the same radioactive source. One is exposed to the environment (smoke) and the other is

[Elecraft] Smoke detectors

2020-10-25 Thread Geoffrey Feldman
The reason to keep smoke detectors from Amateur Radios is that they detect smoke by ionization from a radioactive source. A strong near field will set them off. The good news is that this is your indication that all is not right at the feed line (Or the antenna is unhealthy close). I have had