Several years ago while making inductors for tuning a class E amplifier we end up with a 4-1/2 turn inductor. The inductor used a 3F3 potcore, gapped I think, but it has been awhile. The inductor was driven hard but below saturation. The problem; the 1/2 turn got HOT. Four turns or five turns...

The reason we have Gravity? A correct theory of gravity will show us these four (4) things: 1. It will show us why gravity also acts like acceleration (principle of equvalence). 2. It will show us the actual cause of gravity. 3. It will show us why gravitational mass and inertial mass...

Recently I've build several FM broadcast band superheterodyne receivers using e.g. NE602, SO42, A223D, uA3089PC ICs, ceramic filters and few coils. Now I am looking for similar project for AM broadcasting band. By "AM band" I mean both: Long Waves and Medium Waves. I prefer projects with stages...

In particular looking for dia/pcb layout, or the dimensions of, the sense head...ie of the strip lines, so that i can make swr meter..looking for compact design, to take about 200w max. someone must have some/point me to some plans..(save me having to think..)the rest is made, going to use it...

I'm about to embark on a "vintage" valve (tube) receiver but have a question (probably more questions later!!!) about the IF transformers. Years ago I was able to purchase the transformers for 455 KHz but the ones I want are for 9 MHz. I think I'll have to wind them. I don't have any 10.7 MHz...

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Would anyone happen to know what frequency synthesizer and PLL IC the Grundig Ocean boy 400 uses? I want to change the tuning step on SW to 1 kHz as the 5kHz step is a bit coarse.

On 8/15/2010 3:45 AM, John W wrote: Hi folks, Thank you for all your replies. Some very interesting ideas there. Certainly food for thought. Regards, JOHN

Does anyone know where I can get a circuit diagram for a Grundig Oceanboy 400? Thanks

Are all the fundamental forces nothing but simple PHASE relationships? "in phase attract" Type those three words - above - into Google (Include quote marks) to learn not only the basics of electricity but how all the fundamental forces work. Or click the following link that will give you the...

ok..i know the width of track for 50r pcb stripline using standard 1/16in fibreglass pcb is 2.8mm but howabout 1/8in pcb??? or does anyone have programe that works this out? (for dos/windows .) reason for asking making high power swr meter and i have a large sheet of 1/8 in pcb i need to...

In particular looking for dia/pcb layout, or the dimensions of, the sense head...ie of the strip lines, so that i can make swr meter..looking for compact design, to take about 200w max. someone must have some/point me to some plans..(save me having to think..)the rest is made, going to use it...

On Aug 4, 9:41*pm, raypsi wrote: On Aug 3, 5:30*pm, Gary wrote: On Aug 2, 9:30*pm, Fred McKenzie wrote: In article ,

Does have a link for an evaluation kit with free software for freescale MPC5675K or MPC5643L? Regard; Leland C. Scott KC8LDO "We are not anti-immigrant, we are pro-immigrant. The government is more

hello all, does anyone know if my icom 7400 txvr., bought new in jan. 2004, circuit boards were assembled using `lead free` solder,or leaded solder,and can leaded solder be used to repair or replace parts even if original assembly was `lead free` The sevice manual doesn`t mention this, and tried...

I will probably get some flames from this but here it goes. I have been into CB radio for a number of years but don't agree with most of what I hear. That's just one of the reasons I'm looking to amateur radio. One of the things I often hear in CB circles is that one should turn a 4 watt AM...

In a direct conversion receiver, does the osc. run at exactly the same frequency as the received signal? Assuming the answer is yes; Is it possible to have a high Q LC front end at the output from the antenna, split the signal and feed one output to the rf input of the mixer and feed the other...

I was given a used HP54100A scope. It seems to work, but I'm still trying to figure out how to use it. Seems to be able to display and measure frequency output of my grid dip meter up to 200MHz, I think this unit is good to 300-500MHz? Anybody ever use one of these before? Also I only have...

Hi all As titled. I have just got one out of my stock of parts and have no data. It was bought 15 odd years ago and, sadly, any data with it seems to have gone with the wind. There appears to be no online reference or data for the item in the SBL-1-X series, so no doubt it's obsolete. I am...

Greetings everyone! I have been living in UK the last 8 years, since having to leave my home country Zimbabwe (the Z21GQ c/s). My primary job most of my life was the design and construction of power electronics - things like 25kA rectifiers and railway traction systems, though I started out as an...