days, but what isn't. I just ordered a CM500 from Amazon. $60 plus tax and shipping. https://smile.amazon.com/dp/B004NTG06C?psc=1&ref=ppx_yo2ov_dt_b_product_details Alan N1AL

Right. I used to think that, since the AM broadcast channel spacing is 10 kHz, transmitters must limit their audio bandwidth to 5 kHz to keep the sidebands within a 10 kHz channel. However, FCC rules

I wonder if the problem could have to do with the K3 setup? For example, does the K3 frequency display show the correct transverter frequencies? Another possibility is that the P3's "XV Invert" menu i

I knew it! ("72" is the QRP version of "73" :-) Alan N1AL On 7/3/22 09:09, Al N1AL via groups.io wrote: Does that mean this is a K3-10? :-) Alan N1AL

Does that mean this is a K3-10? :-) Alan N1AL

A number of years ago, I made a spreadsheet listing K3 options for various use cases: http://n1al.net/ham/k3_options.xls The prices are out of date and it doesn't include the new synthesizer board, bu

The noise blanker was added in firmware release 01.29, May 21, 2014. Alan N1AL

All good advice. Another tool in the toolbox is the P3 noise blanker, which can be useful if you are experiencing impulse-type noise interference. In addition to averaging, peak hold can be useful in

I forgot to mention, another way to maximize waterfall history is to change its height. "Waterfall" menu item for the internal display. "SVGA WfHt" menu item for the external display. Alan N1AL

You can slow down the waterfall (both internal and external displays) by means of the "Rate" menu item. This also slows down the spectrum display update rate. Because of its increased resolution, the

the net will bring up mods to address that. For example here: http://n1al.net/ham/fan_controller.htm Alan N1AL

I don't know about the K3 but I have successfully repaired non-functioning switches by cleaning the conductive-carbon contacts with rubbing alcohol and a cotton swab. The contacts seem to get coated w

There can be several reasons why people don't read manuals. One is laziness. But another is that so many manuals are so badly written these days that people get out of the habit of trying to read them

Yes, "linear phase" means flat group delay. In other words, all frequencies have the same delay through the filter. Most Finite Impulse Response (FIR) digital filters are perfectly linear phase. The o

The waterfall is updated at the rate of the spectrum display update. So if you slow down the display update using the "Rate" command it will slow down the waterfall speed as well. Alan N1AL

Don't forget that power splitters only have good isolation if terminated with a good 50-ohm, non-reactive load. For example, a 2:1 SWR is less than 10 dB return loss. Alan N1AL

... The IF out signal loss is only 3 dB or so more than that with preamp off and actually has gain with preamp on. I believe the K3 IF bandwidth (pre-crystal filter) is much greater than 200 kHz. I th

Assuming a reasonably late-model K3 or an older one that has the IF out modification, the gain from the K3 antenna to the IF output is approximately -6 to -7 dB with the K3 preamp off and about +4 to

Hi Chuck, Have you tried doing a Parameter Initialization? (Described in the Troubleshooting section of the P3 manual.) Alan N1AL

Yes, what you're seeing is IF leakage, not the RF signal. The level level is uncontrolled and depends on the isolation of the PIN diode switches, etc. Yes, you can see it by transmitting, with the RS-