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Tom, That suggesion to anneal comes from Roy Lewallen, W7EL.

Hi Ashhar, Good points on building stable VFOs. Likely any L/C oscillator would benefit from these points. When I was a kid building and experimenting with L/C oscillators and VFOs for radios this was

The H and P works only with an already stable vfo that has a long term drift under the locking range. It cant fix a badly made VFO. That said, I should repeat that a stable VFO is so not merely by

Patrick, If you cannot work out the Xloader issues, then you can download the source code from the same link as the hex files.? It is a different zip file. If you go that route, then you will need to

Thanks Arv, will let you know.

Frank, As far as I know, there is not an official way to adjust RV1.? It is a drive setting that I have used to set the output of the PA to a value that is about 12 Watts on 80 meters in CW mode with

Hi Evan , Thanks for Your Reply .? Yes , I seem to have uploaded the? wrong? firmware onto the Arduino Nano . I did origionally try the KD8CEC Software but the links on his site didnt work for me .

Tom You got it! analog VFOs used to drift all over the band. Then came the Vackar design which was very stable. Next seems to have been H&P which made even a Vackar design better (cheaper components

It is amazing how inexpensive standard frequency crystals are nowadays. No need to scrimp there. Maybe, for prototyping, just wire the components together with a brand new crystal, unsolder the old

OK Jerry , Thanks for your reply . I think my problem is the wrong software / firmware is on the Chip and it isnt compatible with the Version 4.3 Board . Have learned a lot in the last 24 hours

I think it is fixed, but let me know if the problem persists. Arv _._

Jaytee1 I just now logged in as administrator and found that you have successfully changed your email handling to "no email". Just to be sure I also set it to "no email". That should fix things but if

SO I have searched and searched, what is the adjustment for RV1 please. -- Frank, KG9H

Okay. Hold on for a few minutes and I will log in as administrator and see if I can change this for you. Arv K7HKL _._

Tom That sounds like an excellent idea. Should be able to hold the CPU clock to within 1 Hz of desired frequency. You might also change the ceramic resonator to a real crystal in your Arduino NANO

So in following the part of this thread that is strictly related to Huff and Puff, was the original reason for the Huff and Puff circuit to create a manual VFO that would jump and hold in accurate

Jerry I think we are still talking about two different animals. H&P does not normally flip back and forth between two different frequencies. It tries to hover around one particular frequency. If the

I accidentally deleted my previous email on this, reposted havre reposted again. Arv suggested to change from “ View all” to View Digest.”. I have selected “No emails” and am still getting

After thinking I needed to get an SWR meter for checking my 2M Larson antenna, I suddenly realized I'd be miles ahead and better off with the Antuino. I ornded one on Saturday and hope to get it soon.

Mine came too with the enclosure and perfectly aligned. The Output Port in SNA mode delivered in my unit more than -20dbm so for accurate measurements I use attenuators. Mine was one of the first