Re: Cricket 40
Frank:toggle quoted messageShow quoted text
I powered my KX3 this morning first with an Astron linear supply. I turned off the AGC, set the radio to 7040 kHz, and cranked up the audio gain to max. There was no antenna on the radio, so all I heard was background noise. Personally, the hum from the Astron sitting a foot away was about as loud as the noise coming from the radio. Next, I removed the Astron supply and attached my 18 volt string trimmer battery running a buck converter that I bought online. The voltage was set to 13.2 volts. I can't remember where I bought the converter or what brand it is. If you'd like, I can look at the converter PCB and see if there are any identifiable markings on it. I think I paid $3 or $4 for it when I bought it a couple of years ago. Anyway, I honestly couldn't tell any difference in noise level when using the two different supplies. I'm sure if you put a scope on it, you could see a difference. According to that informative video we were pointed to a few days ago, the noise gets worse as the load increases. The KX3 current drain on receive isn't very much but I suspect it's a whole lot more than that of a Cricket 40. Otherwise you couldn't power it long with a 9 volt battery. Furthermore, I suspect a Cricket 40 on transmit doesn't draw much more current than the KX3 on receive does. So without having a Cricket 40 (or an antenna), I would think you'd be OK. You aren't risking much money in either case, about the price of a high quality 9 volt battery.
I hope this data point helps. If you need further information, let me know.
On 1/2/20 5:40 AM, John Lonigro via Groups.Io wrote: