Messages

1

The RF Workbench / Help with an FM Jammer

« on: December 23, 2016, 0356 UTC »

I need a bit of guidance with my latest RF project and it's something I cant really ask my Ham buddies about.

I built this VHF Jammer as a gift for my sister, she works in a small office with a colleague who likes to play the radio too loud.
Long story short; the guy is a jerk and wont turn it down and the HR officer is the guys buddy and isn't really doing anything about it.
As a caring brother this situation makes my blood boil so I've decided to help her.

I prototyped the circuit on perfboard, it worked but with a lot of frequency drift.
Next I designedand etched a simple PCB and soldered it all together.



Problem is it still has really bad drift.
This is the first PCB i have designed for an RF project so I am wondering if I did something obviously wrong.
I would appreciate any input I can get here.
   

2

General Radio Discussion / Re: Setting up my first Beverage, looking for input

« on: October 04, 2010, 0736 UTC »

It took me entirely to long to realize what you were talking about.

3

General Radio Discussion / Re: Setting up my first Beverage, looking for input

« on: October 03, 2010, 0644 UTC »

A half wave Beverage just is not a Beverage

Agreed, I cut my Bevy to be 2λ at 6.925 (86.6 meters to be exact).
I was on the ball in that regard, however comically futile my precision was.

4

General Radio Discussion / Re: Setting up my first Beverage, looking for input

« on: October 01, 2010, 0659 UTC »

Do you detect any significant directivity?

Yes, there is significant directivity with proper termination.
I used a potentiometer for my terminating resistor because I have no way of
measuring the feed point impedance. The get the proper setting I did the following.
On 80 meters I found a Ham behind me in Alaska talking to someone in the lower 48.
I hooked the output from my rig into a CB, walked down to the end of the beverage,
tuned in the CB on a handheld and then I adjusted the termination resistance to whatever
made the Alaskan's signal fade the most.

Interesting note, the Zo of my Beverage is around 800 Ohms.
Does that seem high?

5

General Radio Discussion / Re: Setting up my first Beverage, looking for input

« on: September 30, 2010, 0623 UTC »

So ... numerical result data wasn't convincing?

Sorry SW-J, nothing personal against you old bean, I just cant bring myself to trust numbers.
You see, they killed my father...

6

General Radio Discussion / Re: Setting up my first Beverage, looking for input

« on: September 29, 2010, 0503 UTC »

So the Beverage is up, about 1 Meter above ground and 80 Meters Long.
Even at that short a length it is working wonderfully .  On 160 and 80 meters
signals are around S2 quieter then my G5RV at 40 Feet, but they are much easier
to hear as the antenna is much quieter. 
On the funny bands it works just like Tube Shortwave said, in fact I have not been able
to hear anything above 5 megs on it aside from local CW .

I had never really considered a Loop or a Rhombic, but I have been convinced.
I've decided on a terminated Rhombic as my next antenna project.

I'll keep you all informed, and thanks again for all the tips and information.

7

General Radio Discussion / Re: Setting up my first Beverage, looking for input

« on: September 09, 2010, 0629 UTC »

Thanks for the replys guys.
I just moved onto a nice big property in the middle of the Yukon Wilderness.
There is little to know RFI neer me and everything I want to hear is to the South
so the beverage's directivity is a big plus. 

8

General Radio Discussion / Setting up my first Beverage, looking for input

« on: September 08, 2010, 0338 UTC »

Hey folks,

I'll be setting up my first Beverage sometime this week (when the wire spool finally arrives).
I've read through many resources, Including W8JI's construction manual and the ARRL Low Band DXing book.

However, these books are written by Hams for Hams.
I am not interested in listening to bored retires talk about their grand kids
and their glaucoma medications , I want to use it to listen to Pirates.
Does anyone in the Pirate community have any piraty tips for me?

Would a jolly roger help?

Should I use discarded peg legs for supports?

Thanks in advance.

9

General Radio Discussion / Re: HERE COMES THE SUN - (WITH A Vengeance)

« on: August 07, 2010, 1331 UTC »

So the first big solar flair in recent memory is going to hit on Tuesday
and I'll be stuck in a bush-camp miles away from my radios.

Thanks Sun, you've screwed me again. 

10

General Radio Discussion / Re: Islands of Resistance

« on: August 06, 2010, 1247 UTC »

HA!!!! Love these replies.

cm, could the Yukon secede with you guys?  NWT is always late with the rent and
Nunavut just mumbles in the corner.
Al, maybe we're just overcompensating because on the maps we are always pink.
I'm not sure why, I mean, I always thought of Canada as blue... for half of the year anyways.

11

General Radio Discussion / Islands of Resistance

« on: August 04, 2010, 1332 UTC »

Islands of Resistance, a good read about pirate radio in Canada,
is now available as a free PDF at http://www.newstarbooks.com/pdfs/books/9781554200504-Resistance-web.pdf.

If your not to sure where Canada is take a look at your map.
We're the slightly larger one that's on top of you. If this were prison we'd be the butch. 
Alaska is just there so we can give the reach around, Canadians are polite like that. 

12

General Radio Discussion / Re: Spain Planning a Pirate Radio Crackdown

« on: April 30, 2010, 2302 UTC »

It's Newton's 3rd, "For every action there is an equal and opposite reaction".
I feel that this applies to all systems, from elementary physics to sociology and economics.
   

13

General Radio Discussion / Re: Spain Planning a Pirate Radio Crackdown

« on: April 30, 2010, 0027 UTC »

Spanish Pirates didn't expect it.


No one ever does.

14

General Radio Discussion / Re: I knew it, I knew it, I knew it!!!

« on: April 28, 2010, 1953 UTC »

The other twenty percent of the events are likely
fabricated to make the movie more entertaining to the audience.

Hilarious!

15

North American Shortwave Pirate / Re: 6930u Outhouse

« on: April 28, 2010, 1010 UTC »

Wonderful...  I lost my virginity to some fookin slob in an outhouse.
All my dreams are coming true