For TX I would only use toroids or air wound coils. For RX you could use radial or SMD. The Q might be better with toroids, although.

Indeed, if the AM station is on mediumwave a BCI filter (just a highpass filter) is the solution. I have had a similar issue with a religious FM channel I heard spread over the 144mhz band. A highpass

I in my opinion the carrier is within the passband, you should move the BFO to have a crystal clear modulation.

I can understand that the multiband ubitx would have become a killer of the bitx40 or other monoband qrps. In any case, in my opinion, monoband qrps at V or UHF would be still very well welcomed by th

Hi folks, so far I have been impressed by Antuino! It is really a cool tool! I could tune some filters much better than before, FM broadcasts notches, a 2m mag loop, and even a helical filter on 432Mh

Thanks Raj for pointing out that the output in the SNA mode is a safe -20dbm. What are the outputs in the SWR or PWR modes (I haven't used the PWR mode so far)? -20dbm would not deliver enough drive f

I would add the same question for ceramic filters and resonators.

Great advices and explanation Allison! What about testing SAW filters, is there a so stringent limit to - 10dbm (like crystal filters) to test them safely?

I am a proud owner of Antuino. I think it delivers around +10dbm in SNA plot function (correct me if I am wrong) at the RF out and at RF in on SWR plot function. Even if it shows - 20db on the plot. I

Thanks Raj for the great hint! I feel lucky I haven't waited 40 years for Antuino. It's really cleverly designed!!!

I see. I get - 17db rf out. So I added a non inductive -6db 2ghz attenuator and I get - 20db. Now I see insertion losses.

Hi Raj, yesterday when I tried to join the Antuino group I got the answer that my email was already added. But apparently I am not receiving the emails. The version I have was built in late August and

I mean the loss in db within the passband of the filter. Or a loss in a cable.

Hello Folks, finally Antuino knocked to my door! I have played with it plotting bandpass and notch filters. Nice and practical, however how do I determine the loss of my filters in terms of db using A

There are some improvements over the version 3 and 4. If there is no written indication on the board, look at the differences on the board and the schematics. You should see an LC filter between the 1

About the 12mhz spur, the trap I believe is not that simple. Please let me know a good design without affecting the 30 and 20m bands. Checking it on my SDR receiver is really very low.

The KL203 senses the RF and less than 1w average power is needed. That is why it works as is with a softrock in AM FM and likely in CW. In SSB the average power is far less as in most transceivers unl

The KL203 is a tabu in the ham community. Don't even think to add in parallel or replace C14 with a 500V 1000pf.

The AN762-140 should be a good amplifier, I think it was described so in the ARRL 2010 Handbook. It needs lowpass filters like those Communication Concepts sells. It seems not overly complex to build.

Rechargeable AA batteries are nominally around 1.2-1.25v, 6 of them would provide 7.2-7.5vdc. Would it be too low?