Search results

This is great. So many ideas Here is a quote from Antenna -- Feed line Matching Simplified ByDonald Sanders W4BWS "Impedance The use of a half wave, or multiple thereof, coax or parallel conductor feed line connected to the antenna will allow the antenna to be raised to its operating...

100% Agree!! Cheers CBPhreaker

I think it rather obvious that the VSWR would be reported as less than it really is at the end of a long length of coax...it's kinda common knowledge..don't you think? My theories aren't really theories unless you consider my references as nonfactual. You didn't really add anything to this...

This is exactly how misconceptions are started. It's ALWAYS best and prudent to verify any and all information from respected sources before committing them as fact in your head. No, the length doesn't matter. But for perfection sake I should note that good quality coax should be used for...

Nice. Ill help you with what ever I can. Best CBPhreaker

Your not kidding about common mode current! A quote from one of my "bibles", The ARRL Antenna Handbook From the sub title "SWR Change with Common Mode Current" "In theory at least, we have a situation where a change in the length of the unbalanced coaxial cable feeding a balanced dipole will...

Is exactly the same thing as Your right the SWR doesn't really change just the apparent SWR and a simple diode type meter doesn't understand complex X but a more simple measurement of Z. As in I should have defined apparent swr.

He should show a screen shot of the paypal transaction not the sold sign. I love the status of the radio "For parts or not working" on the ad. A futile attempt using artificial bidding to drive the price up.

Wow, lots of information on this post. Perhaps this may answer your question with a more practical application than theory of X's. If you have a 1/4 wave length of coax the it's exhibits a Hi to Low conversion. In other words it's an impedance inverter. If you have 1/2 wave length piece...

Audiophiles consider the D.A. and ESR when choosing to use Tant. over Elec. The claim is some amount of audio will cause the resistance of the cap. to modulate which in turn will cause the plates of the cap to vibrate at an audio rate. The theory is the vibration of the plates colors the...

You will be happy with the performance of the loop once you get the line issues straightened out. You already have the right idea with the 450 Ohm balanced line. I always wondered why more CB operators don't use this stuff. The loss per hundred feet is around 4 times less than LMR400 and...

I'm looking for broken, not working almost complete Cobra 29LTD Classic, or ST and a broken or non-working Cobra 148. It doesn't matter whats wrong as long as its mostly complete. Please send me a couple pics and your price and I get back to you asap. cbphreaker@gmailc.om Cheers CBPhreaker

If you use 50 ohms unbalanced into a 4:1 balun you'll end up at 200 Ohms balanced "on the other side. 450/200 = 2.25. So you'll have a line with an swr 2.25. While this swr isnt that bad for ladder line you can get an easy transformation to 450 by using a 1/4 wave length of 300 ohm twin...

http://www.radiomods.co.nz/galaxyfc347_texasrangerfc390mods.html This should give more light to the situation. I believe the the jumper is for a 10.695 IF or 7.8 IF selection. Those type of freq counters don't take into account the IF hence the jumper. So there is a chance the counter would...

Translation from Japanese D104-M6B Video I've never translated technical stuff from Japanese to English so forgive me if Im not 100% correct. I will write the literal first then the translated meaning to English below the sentence. Report from Yamanashi Hello from where I live in...

I love all the personalities coming out, yes? This is really and truly a great thread indeed.I hope to hear the passion on the air and not written on a forum. Cheers, CBPhreaker

@LeapFrog It may be prudent to use some kind of buffer circuit between your audio source and the high level audio amp. I mean more than just a cap. The MPF102 is a cost friendly and very warm sounding FET. Cheers CBPhreaker

Hey Technicoloco!!! How the heck are you? I read the page (your link to AM window) in reference to the 440 and the heart of it's AM generation is exactly the same as the Low-Level mod. Using the AN612 as an AM modulator. The caps, resistors, and the filter designations are not compatible...

Hello 222dbfl!! The basic reason I , personally, started down this road is simply audio bandwidth vs. cost vs. hack factor. I'm sure Alessb has his or hers own reasons. 1. Audio bandwidth of 1-20khz+ is not something a cb or export radio will do out of the box. 2. It may seem like the...

Greetings, I've successfully pulled this off with a Cobra 2000 and 148, going around the high level modulator and using the AN612 as a low level modulator and running the drive and final in linear mode. Although I only glanced at your schematic, I didn't see where in AM mode you go around...