RF

AM TRANSMITER (31) AM POWER MODULATION (10) AMATEUR RADIO (25) FM RF CIRQUIT (31) HAM RADIO (21)
Εμφάνιση αναρτήσεων με ετικέτα HAM RADIO. Εμφάνιση όλων των αναρτήσεων
Εμφάνιση αναρτήσεων με ετικέτα HAM RADIO. Εμφάνιση όλων των αναρτήσεων

ΕΤΣΙ ΦΤΙΑΧΝΟΥΜΕ ΜΙΑ jpol_antenna

ΕΤΣΙ ΦΤΙΑΧΝΟΥΜΕ ΜΙΑ jpol_antenna

I've had many requests for a ready-made J-pole design that will enable the
Packet Radio user to print the image from a web page and go directly to the
construction table and build a J-Pole antenna for their Packet Radio station.

The object is to eliminate the need to go through all the calculations on
another page of this website.  These requests are valid and understood!
With your requests in mind, here are "the real world" designs that I've
personally constructed and use at many of my Packet Radio node locations.
 
 A VARIATION ON A THEME:

Let's look first at FIGURE 1a;  This is the overview and profile of the
J-Pole we will be working with.  There are two different bands we will be
building the J-Pole antennas for.  NO, we will not build a two band antenna
on one mast.  I've been there, done that.. and it is an excercise in futility.

For openers, I would like to show you that all J-poles are not created equal.
By that statement I mean, we will modify our construction techniques a bit
and apply a variation to the theme.

Notice in the exploded view at FIGURE 1b, I've deviated from the usual RF feed
technique that we normally use to attach our coaxial cable to the J-pole.

Where we usually attach the shield and center conductor to the tuning stub and
the driven element with aeroseal (hose) clamps, here we've made a slight change
in the design by exchanging the elbow for a tee.  Below the short (1/4 wave
tuning stub) section, we (carefully) soldered an SO-239 (Chassi-mount) coax

ΑΠΙΣΤΕΥΤΗ ΠΑΤΕΝΤΑ ΠΥΛΩΝΑ ΓΙΑ ΟΠΟΙΑΔΗΠΟΤΕ ΕΚΠΟΜΠΗ

ΑΠΙΣΤΕΥΤΗ ΠΑΤΕΝΤΑ ΠΥΛΩΝΑ  ΓΙΑ ΟΠΟΙΑΔΗΠΟΤΕ ΕΚΠΟΜΠΗ

ΜΕ ΤΕΤΟΙΟ ΤΡΟΠΟ ΠΟΥ Ο ΕΝΑΣ ΕΙΝΑΙ ΜΕΣΑ ΣΤΟΝ ΑΛΛΟ ΚΑΙ  ΤΟΝ ΤΡΑΒΑΕΙ ΠΡΟΣ ΤΑ ΠΑΝΩ...ΟΤΑΝ ΘΕΛΟΥΜΕ ΝΑ ΚΑΤΕΒΑΣΟΥΣΟΥΜΕ  ΚΑΤΕΒΑΙΝΕΙ ΑΠΙΣΤΕΥΤΑ ΕΥΚΟΛΑ...

ΕΤΣΙ ΑΠΛΑ ΚΑΝΟΥΜΕ ΑΠΟΧΑΛΚΩΣΗ


ΕΤΣΙ ΑΠΛΑ ΚΑΝΟΥΜΕ ΑΠΟΧΑΛΚΩΣΗ!! 
ΑΚΟΛΟΥΘΗΣΤΕ  ΤΗΝ ΕΥΚΟΛΗ ΚΑΙ ΑΞΙΟΠΙΣΤΗ  ΛΥΣΗ !!


ΑΠΟΧΑΛΚΩΣΗ ΤΥΠΩΜΕΝΟΥ  
        

  
Η αποχάλκωση γίνεται με διάφορα υγρά αποχάλκωσης και διάφορους τρόπους.    
Εγώ χρησιμοποιώ τα ακόλουθα υγρά και τον εξής τρόπο:            
Σε μια μικρή πλαστική λεκάνη βάζω κάποια χημικά υγρά σε διάφορες αναλογίες.    
Πρώτα βάζω 50 gr υδροχλωρικό οξύ(HCL) ΑΚΟΥΑ ΦΟΡΤΕ που το αγοράζω από το σούπερ μάρκετ. ....

100W Transmitter Amplifier for 2MHZ

100W Transmitter Amplifier for 2MHZ ΑΚΟΛΟΥΘΗΣΤΕ ΠΙΣΤΑ ΤΟ ΣΧΕΔΙΟ 
100W Transmitter Amplifier for 2200m
100W Transmitter Amplifier for 2200m


100W Transmitter Amplifier for 2200m




This particular transmitter was later shipped up to VY1JA in the Yukon where, thanks to Jay's excellent antenna system, it was heard in Europe as well as in New Zealand during one of the Trans-Pacific Tests! Running 24 volts on the final will produce 100 watts into a 50 ohm load. The transmitter utilizes a 4060 binary counter IC chip as both the crystal oscillator and frequency divider. I used a 2200 kHz crystal along with the 'divide-by' sixteen output to produce a signal at 137.5 kHz. Other combinations of crystal frequencies and 'divide-by' combinations may also be used since the 4060 features divided outputs for f/32 (pin 5) and f/64 (pin 4), among others. You may have a 4MHz crystal or an 8MHz crystal in your junk box that will put you in the band using these output pins.