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Dave, Just tried (4:03pm EDT) and OK. You might have to clear out your cookies. The new privacy rules are making it difficult to access sites you may have visited before. Don't know. best, j

Must be something local this side of the pond as nslookup does not give me a valid reply for their address Will try another ISP and see what happens Dave G8PGO

?Thanks for confirming that idea of how they work. I have one sitting at home that I flat could NOT understand how it works, but the circuit is identical to what we're seeing here --- two coupled

try just this: http://gapantenna.com/

It works in southern California. Kevin Sent: Wednesday, August 1, 2018 12:27 PM To: [email protected] Subject: Re: [BITX20] Off Topic: Gap Antennas Just tried again and still get 'can't reach this

I wanted to keep that separate. There are several reasons one is tuned means any parasitic elements like lead lengths, circuit capacitance are absorbed in the tuning and inductor.? ? ?The only

Just tried again and still get 'can't reach this page' Must be something local Dave G8PGO

Gordon, The coupled coils approach is so old school I'd suspect is had origins in the late 20s or 30s if not before with spark. It persists because it is easy to understand, build and?does indeed

It's warranted as new, so it is new.

GAP Antenna Products | Revolutionary Antenna Technology worked fine for me. | | | | | | | | | | | GAP Antenna Products | Revolutionary Antenna Technology | | | Jack, W8TEE

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