开云体育

Your circuit and method look Ok to me... how bad is the drift, and what happens if you wait longer than 5 minutes? The drift could also be in your frequency counter (or PC if you are using that as a

Hi Arv, Thanks a lot for the very detailed reply to my query and for offering to advise me on any problems I might face with building the trx. Knowing that I can bank on the group's knowledge and

Paolo In the US, plastic knitting needles are available for an attractive price. These range from 1/8 inch to 1/2 inch diameter. The smaller ones are easily ground to a screwdriver point using

Bharat The discrete component AF Amplifier file is in the FILES and PHOTOS sections of the BITX20 forum on Yahoo.com You should be able to view and copy them from there. If you have problems please

I have found a 'source' of minature binocular balun cores in old UHF TV tuners and computer UHF modulators. there are usually, it appears, one or two per tuner. Not tried them yet though. atb Mike

Dear forum, I try to measure my 12 MHz IF-crystals with method here, for purpose selection within 30 to 50 KHz ( is this value right ? ). But the problem is: Frequency reading is still moving /

Hi Paolo, I cut/filed a piece of PCB to the right size and sanded of the copper. The slight advantage over a toothbrush is that the material is less soft, so it can handle screws that are tight or

Mike W wrote: WOW! Got to ask my mother if she has some spare plastic ones! For those non-native English speakers that might wonder what a "knitting needle" is, see the description here

Whats wrong with the old plastic knitting needle ?. When playing with HV circuits they are a lot longer and therefore safer. Another useful tool is a tuning wand, brass ferrule on one end of a

Hi! I recall reading about the two relay placement being helpful in avoiding RF pickup. I would be obliged if the someone will give me the new configration. 73 Rahul VU3WJM

Hi! I fashion them out of glass epoxy PCB material. Much scrapped double sided PC boards are available.. cut a strip from area without copper traces ie normally the edges . File and shape the strip

Hi, following Arv Evans's useful tips I would like to share with you how I built a non-conductive screwdriver to regulate capacitor trimmers. A quick glance at the BITX20 schematic did not reveal any

Hi Arv, I'm thinking of building a 40m version of the BITX20. As Ashhar mentions in one of his earlier mails, that is the band more popular here in India. Could you please guide me on the

I'd like to remind all that ScotchBrite is a relatively non-reactive abrasive matrix that works well with reasonably non-reactive chemicals. It's worth trying with Tarn-X or other "tarnish-removing"

Brasso is another cleaner that I have used in the past. Does an excellent job! http://www.kilianhardware.com/brasso.html http://www.stanleylondon.com/brasso.htm 73 de Baino wrote: Tarn-X.

Would those be "Blue - blue, blue suede shoes?" Theo

Thanks a million, Monty, Great job. And thanks to Arv Evans for sharing this circuit :-) Regards, John ============================================= email: k5jhf@... photos:

I'd like to suggest the use of a copper/silver cleaner, such as Tarn-X. I don't know what would be similar across the pond or in other parts of the world. I just pour a little bit of Tarn-X on a

Hi Can I also suggest that where the components are to be placed that the PCB pad is tinned and where earth connections are to be made that area too is tinned, as it ensures a good joint and the joint

Hi PC Board material that is stored for some time usually takes on a layer of oxidation that hinders soldering components to its surface. In the past I have routinely used sandpaper to remove this