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Can't get to Gap Antennas web site. Is it just me or something else that I have missed 73 Dave G8PGO

Hi -- I read the suggested pages, including: https://m0ukd.com/homebrew/baluns-and-ununs/end-fed-half-wave-antenna-tuned-coupler-efhw/? Those are indeed quite simple and apparently effective tuners

I'm trying to buy 7" , can somebody tell me if it's ok to buy this .. English Version Nextion 7.0" HMI Intelligent LCD Tough Screen Module Display for Arduino LCD TFT Raspberry Pi ESP8266

The combined effect of the rely mod and? the audio switch mod do help greatly. If the DC switching scheme also used a pair of contacts to pull the floating TX+/RX+ to ground it would help as well.?

ABSOLUTELY! This is a no-no and needs to be corrected on all v3 PWBs. I noticed in the new design (v4) he does not use this T/R relay audio switching scheme.I suspect it was done in part to deal with

Gordon, There is no need to do the testing at high power. I simply terminated the transformer in a 2470 ohm load made up of a 2K and a 470, 1/8th watt resistors in series. My testing is done at a

If you buy it, it's "new" to you. Vince - K8ZW. -- Michigan VHF Corp. http://www.nobucks.net/ http://www.CDupe.com/ http://www.metalworkingfun.com

One has been sold and shipped, still have the other one. W0EB

Wow. Perfectly satisfied with mine. I did remove paint a couple places to insure the case was grounded. No biggie. A LOT of effort and material for a tiny price in my opinion. 73, Bo W4GHV since '54

for the parallel resonant see: http://www.aa5tb.com/efha.html Also: https://m0ukd.com/homebrew/baluns-and-ununs/end-fed-half-wave-antenna-tuned-coupler-efhw/ As to what toroid for tuned usually iron

omitting the word "new" is more accurate. I have purchased several refurbished Dell box PC's with great success. $300 is a great price to pay for this PC.

Chuck, Alyson, and others: could I get a schematic of your parallel resonant tuning system? And could I get Alyson and or Warren to come yet on what permeability toroid is optimal? Warren, I’m not

I don't accept their .2db.? Also their process is only workable if they do the math to back out the? mismatch loss. Do I think their procedure is a good way to do it.? No.? Did that do the math to

Tim, I did see that.? I appreciate that but I do have stock here thank you. Allison

Chuck, I haven't yet built two 49:1 (one is not enough for the back to back test hi hi ), but I would use ferrites with permeability close to 800, not the powdered iron toroids like the red and the

Mine took about 6 weeks to get to Arizona, but it was worth the wait.? Good looking cabinet.? I agree with others that paint in the openings was heavy, but a little sanding with a Dremel tool took

Dexter On further examination the problem seems more insidious than just the single capacitor in the audio section.? Each bidlrectional amplifier has its owm small capacitor and apparently

BTW: in the original BITX20 these diodes were in eacht RX and TX path leading to the individual amplifiers. Henning Weddig DK5LV Am 31.07.2018 um 11:25 schrieb n1kw@...:

So for BITX40 a diode in series with R111 blocks C11 from supplying Q16 as well. Now supply that diode direct from +12, no on/off of U1 and less current through K1 pin 3. R111 can then be either

I've gone this route also, Gordon.? I bought 4 uBitX units, with the intent that I will have several HF rigs for operating activities such as Field Day, and as HF rigs to loan to new hams.? For both