Ham Radio

Thursday, November 29, 2007
CQ100

CQ100 is a program for use exclusively by licenced radio amateurs and is a simple and effective
way to keep in touch with hams all over the globe 24 hours a day without any propagation.
If you are interested you can download a 3 month free trial if you follow this link
I have already heard many CQ calls through the CQ100 virtual radio and I will be listening out
for you all, and monitoring all the other bands at the same time on my real rigs!
73 C u agn
Simon
posted by Simon Davison @ 7:08 pm   11 comments
Saturday, November 24, 2007
Homebrew 40/80 Trap Dipole Design


This Antenna design was one that I used about 4 years ago, it worked exceptionally well on 80m and 40m. The size of the antenna makes a Half wave length on 80 meters, and with the traps a half wave on 40m with a SWR (standing wave ratio) of 1:1-1.5 across both bands.

It worked well also on 20m with the use of an A.T.U (antenna tuning unit).

I made my version of this antenna using 3mm multi strand copper cable which I left covered by the PVC insulation.

The traps can either be home brewed using some 40mm diameter plastic drain pipe and winding wire around the pipe approximately 10 turns, then connected in line after the 10 metre lengths. Or the alternative is to purchase some commercially made 7.1 MHz traps, and fit them in line the same way.

The antenna can be fed with 50 ohm coax with a home brew balan or again a commercially purchased balan.

The wire lengths of the dipole are 2x 10 metres and 2x 6.7 metres as shown on the diagram above.

This antenna can be mounted quite low to the ground if you wish to produce a high angle of radiated signal which is good for distances of 0-1500 km.

For DX work a lower angle of radiated signal can be obtained by mounting the antenna 10 metres or more above the ground. The higher the better!

If you get chance to try this simple design, I am sure you will not be disappointed.

Good luck and hope to hear you on the bands.

de 2E0HTS 73

posted by Simon Davison @ 5:21 pm   4 comments
Tuesday, November 06, 2007
Heil Goldline Studio Mic

Greetings to all, I recently acquired the Heil mic and had planned to use it in the mobile with the ft-100, but after trying it out I decided to stick with the original fist mic from Yaesu. The Goldline from Heil had struggled to pick up my voice from the dashboard mounting bracket, and with the whole idea of making mobile operations more inconspicuous by not drawing attention to myself, fitting a hands free mic seemed to be out of the window. I was having to shout that loud to hit the alc level, most peoples heads were turning and wondering what I was shouting at. So back to basics and the fist mic wins!


I then decided to try the Heil microphone in the shack on the ft-767. This was the beginning of a potentially beautiful relationship as the rig and mic compatibility seemed good with some good reports from experienced G-Stations on 80 meters. I have been using the microphone for the last couple of days and I am finding it OK with the wired PTT switch in my hand and ready to engage. The switch reminds me of a missile detonator, so you can imagine the pressure every time I transmit. h.i.


I am impressed so far with the new microphone so I decided to make a miniature tower style mic stand to mount the Heil Goldline. You can see the finished installation on the picture, I hope to make some more noise soon. 73 good DX


posted by Simon Davison @ 6:13 pm   8 comments
Thursday, November 01, 2007
Q-CODES
I have recently had the pleasure of assisting a fellow member of Staff at work by helping him train to become a radio amateur. Chris is an electrical lecturer at the college where we both work, I was extremely happy when Chris asked me to help him get into the hobby and with his electrical/electronic knowledge it will be fairly simple to pass the foundation examination and obtain the licence which will allow him to operate his recently purchased yaesu ft-847.
Good luck with the exam Chris and welcome to the world of Ham radio.

Chris asked me about Q-codes so I decided to post the list of Q-codes which are used by radio amateurs around the world. The Q-codes were originally invented for use with telegraphy and then Morse code allowing messages to be transmitted quickly without having to rattle out long and difficult sentences. These days they are still used as a way of sending voice messages as well as Morse, whilst communicating with another station. The Q-codes can be very useful especially when two stations in communication with each other may not speak the same language as the Q-codes are a universal language.

QRG Exact frequency
QRI Tone (T in the RST code) UR QRI IS 9
QRK Intelligibility (R in the RST code) UR QRK IS 5
QRL This frequency is busy. Used almost exclusively with Morse code, usually before transmitting on a new frequency
QRM Man-made interference ANOTHER QSO UP 2 kHz CAUSING LOT OF QRM
QRN Natural interference, e.g. static crashes BAND NOISY TODAY LOT OF QRN
QRO Increase power NEED QRO WHEN PROP POOR
QRP decrease power QRP TO 5 W
QRQ Send faster TIME SHORT PSE QRQ
QRR temporarily unavailable/away, please wait WILL BE QRR 30 MIN = THAT STN IS QRR NW
QRRR Distress Distress call recommended by ARRL
QRS Send slower PSE QRS NEW TO CW
QRT Stop sending ENJOYED TALKING 2 U = MUST QRT FER DINNER NW
QRU Have you anything for me? QRU? ABOUT TO QRT
QRV I am ready WL U BE QRV IN UPCOMING CONTEST?
QRX will call you again QRX @ 1500H
QRZ You are being called by ________. QRZ? UR VY WEAK (Only someone who has previously called should reply)
QSA Signal strength UR QSA IS 5
QSB Fading of signal THERE IS QSB ON UR SIG
QSD Your keying is defective QSD CK YR TX
QSK Break-in I CAN HR U DURING MY SIGS PSE QSK
QSL I Acknowledge receipt QSL UR LAST TX = PSE QSL VIA BURO (i.e. please send me a card confirming this contact).
QSM Repeat last message QRM DROWNED UR LAST MSG OUT = PSE QSM
QSN I heard you QSN YESTERDAY ON 7055 kHz
QSO A conversation TNX QSO 73
QSP Relay PSE QSP THIS MSG TO MY FRIEND
QST General call to all stations QST: QRG ALLOCS HV CHGD
QSX I am listening on ... frequency QSX 14200 TO 14210 kHz
QSY Shift to transmit on ... LETS QSY UP 5 kHz
QTA Disregard last message QTA, DID NOT MEAN THAT
QTC Traffic STN WID EMRG QTC PSE GA
QTH Location QTH IS Baildon in Yorkshire U.K
QTR Exact time QTR IS 20.00 utc
posted by Simon Davison @ 8:51 pm   0 comments
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