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160 metres and the uBITX

barry underwood #61933 Looking at the output of my uBITX on 160m on a spectrum analyser, you don't want to go there! However, a simple external low pass filter makes all the difference. Attached is the circuit of a LPF that I built, along with before and after analyser screen shots of the output of my uBITX. 73 de Barry, G4BUD With Low pass filter.jpg Without low pass filter.jpg 160m external LPF.png
John All Messages By This Member #61938 This was my scope capture with the CW key pressed. ? John, K5GT
Jerry Gaffke All Messages By This Member #61950 Yup, you need an external low pass filter if you want to operate on 160 meters. That should not be a surprise. See post? ??/g/BITX20/message/48125 toggle quoted message Show quoted text On Sat, Nov 24, 2018 at 08:24 AM, John wrote: This was my scope capture with the CW key pressed. ? John, K5GT
barry underwood #61951 I didn't look on a scope, but could well believe that waveform given the harmonics seen on the spectrum analyser. Certainly needs some good filtering. No one should be using the uBITX on 160 as is. -- Sent from my Android device with K-9 Mail. Please excuse my brevity.
Vince Vielhaber #61954 The uBitx isn't designed to be used on 160. The LPFs are for 80 and up. Vince. toggle quoted message Show quoted text On 11/24/2018 02:01 PM, barry underwood via Groups.Io wrote: I didn't look on a scope, but could well believe that waveform given the harmonics seen on the spectrum analyser. Certainly needs some good filtering. No one should be using the uBITX on 160 as is. -- Sent from my Android device with K-9 Mail. Please excuse my brevity. -- K8ZW

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