Saturday, February 20, 2016

Beginers Amateur Radio notes-1

An article by OM Sathyapal, a patron of Indian Institute of Ham, as published iin facebook. They are doing very fine job its reported that around 10k hams been made by IIH over the decades. Thank you IIH for doing this great service to ham radio. Please read on.....

Brief Note for beginners:

 What Amateur Radio Equipment Is Best For A Beginner?
There is so much radio equipment available...

 When you're getting started in Amateur Radio you'll need to pass an exam and get a license from the WPC before you can transmit anything at all, unless another licensed amateur radio operator is there to oversee your transmissions.

Years ago if you wanted an Amateur Radio operator's license, you needed to learn and pass a test in Morse Code, but not any more (Resticted grade). You can get 'On The Air' with a minimum of fuss and find out how large the worldwide community of licensed Ham Radio operators is.Incidentally, the Morse Code (often referred to as just 'CW' or Charlie Whisky) is still used because it has some advantages, but hams use it by choice. Apart from voice modes (usually FM or SSB) there are numerous Digital Modes available to Hams as well. Most of them involve the use of a computer and./or a radio modem.

What To Buy Once You Get Your Ham License?

 HF, VHF or UHF radios are all used by Amateur Radio operators -
A 2 meter band VHF FM transceiver or walkie talkie will probably be your best bet, because it will allow to to chit chat with other licensed ham radio operators in your town or city and get to know them. And with luck, you will find an senior ham who will "take you under their wing" and tutor you.
Having a 2 meter radio will give you access to the 144-146 MHz vhf band that is assigned to Ham Radio operators in India and 144-148 in most other countries of the world. The vhf signals are mostly good for line-of-sight contacts, not for working overseas "DX" stations. A handheld 2m radio will usually transmit an FM signal at about 1 to 5 watts power output, whereas a mobile or base station 2m rig may have an output of 20 watts, 50 watts or higher.

 But as long as you are within range of your ham radio club's local 2m FM repeater tower, you should be able to set up your 2m two way radio to work through the repeater to talk to anyone in or around town who can hear it.

 Transmitting out through a repeater is known as working duplex (technically Semi-duplex). Your 2 way radio transmits on one frequency or channel and receives on a different frequency... and everyone else using the repeater does the same. So while your little handheld radio might only be good for half-a-mile of distance while working simplex (same channel for both TX and RX), when you work duplex you have the added power of the repeater station to help you, plus you have the considerable extra distance courtesy of the great antenna location.

 Most repeater stations have towers for their VHF or UHF antennas, and many are on the top of hills or tall buildings. So your modest walkie-talkie may well be able to talk out to everyone in the whole town or city who uses that channel.

 Since repeaters cost money to set up and maintain, they usually belong to the local ham radio club. Even you can attend meetings and making friends with your fellow ham radio (amateur radio) operators.

 It is those guys (and ladies) at those meetings who can best advise you on what ham radio gear you will need. But do contact them because they'd love to help you. And they can probably help you find good deals in second-hand two way radio equipment, and they can steer you to getting your ham radio license as well.

 Just remember, you may listen to ham radio frequencies before you have a license, but you cannot transmit. In that case, he (or she) will announce their callsign, and introduce you as their guest or "Second Operator".
73

Sunday, December 13, 2015

Fying Pig

Sometimes there are peoples despite their efforts not able to be on air. I have done research. Put this picture and you will be able to be on air ssb-fone.




So, enjoy and follow the HAM cult with full faith. Enjoy Beacons and Rag-chew...

NB:-

After passing the hurdle, I am feeling little boring. My signal is low, vfo not stable, it moves down the freq, On air peoples are very nice gives first times but I am trying to figure  who will allow me break-in second time, who will just ignore, who will talk, who will be friendly, etc etc.... hope to blend in soon. so keeping my over short, interested only in signal reports & c u down the log.

name :- Indrajit,
qth:- Junagadh, near Rajkot, Gujarat state
callsign:- VU3INJ
bands of operations:- 20 meter and 40 meter qrp, vfo
dsb tx on 14194kc, few dc receiver.....

Thursday, December 10, 2015

ITR40-20

I said lets do something different, a basic level thing. We have commercial rigs, we have some homebrew rigs and some homebrew rigs are as par with commercial rigs.

But there is a gap between something called pixie to R7 Dayton receiver. Even simple than a dc receiver, which a novice or a new entrant in ham radio can build without any problem and experience some RF and learn to use cw-tx , cw-rx , antenna, etc  But there is a penalty to simplicity. Only a single frequency. You are tied to a single freq, I have a dream to make a small portable full working airworthy cw transceiver using xtal. Similar to MUZO.

I am making two receivers using cheap and easily found 3.579mhz, 7.159mhz, 14.318mhz xtals for band 40meter and 20 meter.

cw tx using 7.159mhz for 40 meter and 14.318mhz for 20 meter. I have made a pcb pattern. No hole. You place the components on pcb and its done.

have a look






Parts list

ITR40-ITR20

Sr No
Item No.
Value
Note
1
Q1
BC549C


2
R1
2K2


3
R2
1K


4
R3
220


5
R4
100


6
R5
10


7
R6
10


8
C1
0.1


9
C2
0.1


10
C3
100,25V


11
C4
33P


12
C5
33P


13
C6
33P


14
Q2
BF494


15
Q3
BC549C


16
R7
10K


17
R8
47K


18
R9
470


19
R10
4K7


20
R11
10


21
C8
0.1


22
R15
470


23
R20
470 Preset


24
D1
1N4148


25
D2
1N4148


26
C13
100p


27
Q4
BC547


28
R12
100K


29
R13
2K2


30
R14
100


31
C9
100p


32
C10
100p


33
C11
33p


34
C12
0.1


35
Q5




36
R16
2K2


37
C14
0.1


38
C15
10, 25


39
C16
100p


40
R17
1M


41
R18
4K7


42
C17
10,25


43
R19
10




That's it folks.

Wednesday, December 9, 2015

Linear Amplifier Problem- 3

A friend experienced a problem and solved it. first image depeicts the problem and second image depicts the solutions.

Question :---
My friend Vadivel requested in the Indian Homebrewer forum ::  " Help Needed on MOSFET Linear amplifier. I'm using Linear amp used with Minima TRX. Its working very fine. But the low pass filter is getting too hot / smoke after TX of 10~20 secs. I used 2x TV balun glue together and 3 turns of 28 SWG. SWR is corrected with the use of Pi network ATU. Any suggestions welcome. "

 The problem:---

The RF theory :---

The low pass filter was made with the pig nose baluns. But, IMHO opinion it can not handle the passing of 15watt rf.  If  core gets burned or becoming hot, its probably got damaged due to the heat. Please do not use it further. discard that piece and never use this baluns as filter eliment. they can handle just 1watt.

In my experiments I have found that, You need atleast minimum 4 big pignose baluns stacked for linear amplifier transformer.

The solutions :---


The coil is made over the felt pen body. The sketch pen body is the beast material to make the coil for low pass filter. Its diameter is uniform, widely available and most of the time they are in standard size.

A friend suggested  to use air core. And our great elmer shri  Dev Rama Prabhu say's, let me reproduce in his own word ::
Dear sir, if any inductor core is becoming hot it means it is very lossy! Just replace with one more core as these cores are not repeatable! Otherwise as Mr Rajesh has suggested use aircore and I always use aircore with Teflon formers. 73

Saturday, December 5, 2015

Madras Disaster, december 2015

I was seeing the human tragedy at Madras(Chennai, India),due to the natures fury. Even if nature's one element increases Air, Fire, Water,Earth all becomes cause for the disaster. If we are lucky the disaster is small, but there is still loss to the humane and infrastrutcture and in long-run to economy. First thing, we wish in this situation is water, food, hygine, warmth blanket and message from our family they are ok, we are trapped here, save us. In this last thing related to the communications, as a ham we can help them a little.

I look around, am i disaster ready ? Yep, my antenna is up. i have light(electricity), what If ? my light goes out,,, for 5 hours i can use a 40 meter analogue receiver on car battery. After that nothing. sorry, i do not have transceiver...

What ? i can not afford commercial set up, not able to build one, and great ham not able to provide the pre-build air worthy transceiver. But, there are many designs, bitx, vu3gcm,rm96,nr60,vu2atn,various dc receiver,r7, gr7, jota,HF1 etc etc.... there is a gap of simple tech. We have very hi-quality tech,sofisticated, digital, software but not a simplest one.

In the early years of 60-70 our maritime mobile were able to accurately transmit the distres signal in morce ? they were right on frequency ? how did they do it.

Answere is simple 2182kc, 6725kc , 455 to 465, 500kc etc were maritime frequency. I have seen the emergency set powered by a crank shaft, CW, DSB with portable vertical antenna and they all were xtal controlled transmitter. I have seen fixed frequency receiver also to receive 2182kc the local oscillator was 2682kc xtal, IF was 500kc. So, you got two frequency receiver. Damn ! the tech is there.

Our, need of the day is small powered cw or fone transmitter with portable antenna so that atleast they are able to radiate some effective signals around say 50km from the locations and if power is there and antenna is high then full range with big linear. We should go with new tech, that is progress but at the end of the days the morce code will come handy. When power is out, there will be less QRM.

There are many xtal cheaply available i.e 14.166mhz, 14.318mhz, 7.159mhz, 3.597mhz, 1843kc, and 10.000+(4.000 / 4194 / 4433/4286) for twenty meter, 11059-4.000 for forty meter. All our problem of hams not on air can be solved. VU2FI sir, if we import some xtals in bulk from dx or specially made say 14194kc. Let us make some simple design of one to two watt transmitter, simple transistors as active device, less dependance on special ferrite, and simple receiver (DC or Superhet )with sensitive enough to work another local qrp. If person is on air, we can depend on it. our air wave will be busy and no one has the chace to grab it up. Guys, think over it. otherwize as you have seen the everage age of hams at hfi2015 was more than 45 plus. Farhan we expect & request you to help as you can think out of the box, it is out of your league or not intune with what you are doing but we seek you to help. VU2RBI, VU2FI this is answere to your quest what will help ham not to dry up.


***
I put this ideas to the indian and foreign hams. From the response/comments I can say, may be we are not realizing the potential of this old technology. May be electricity and civilization stays with us forever ... BEWARE  there will be few black days also.........
***
My one friend put this on net. I liked the content, as it is useful.

Most Chennaites and people in rest of TN have only WhatsApp connectivity, so please copy this
story and spread through Whatsapp.

As the rescue operations are underway in Chennai, the focus should now shift to how best people can ensure public health and combat the outbreak of water-borne diseases as it is often difficult to maintain hygiene during clean-up operations.
The News Minute has compiled a list of dos and don'ts based on our conversations with doctors. Most of these... are home remedies that you can execute even without power and medical supply. Spread the word and stay safe.

> Using sari as a filter can reduce the chance of cholera and the water-borne diseases. This has proved to be an effective method of filtration in flood-ravaged countries like Bangladesh, with researchers from the US establishing. While boiling water and then filtering it would be more effective but in cases where people have no access to gas or heating mechanisms, filtering water using the folds of a sari is better than no filtration at all.

> If you have no access to drinking water, collect rain water in containers placed on your terrace. This can then be boiled and filtered for use.

> Do not stand in stagnant water. With sewage water getting mixed with all water sources, standing in these stagnant pools can lead to leptospirosis.

> If your food stock is running low at home, take a litre of boiled water and add 5-6 spoons of sugar and 1 spoon of salt. Drinking this at regular intervals will help in keeping the hydration levels high.

> In areas where the water is knee-deep, add bleaching powder or salt to it. It works as an effective disinfectant and also prevent bacterial diseases from getting transmitted.

> For those with access to medicines, stock up on ORS packets to prevent diarrhoea and antiemetic drugs to prevent vomiting.

> Have freshly cooked food that's been heated to boiling point. For those with power, avoid refrigerated food to the maximum extent possible
***
It seems our senior ham VU2FI had set-up a emergency communication room at Banglore and handled 3000 messages and helped in disaster relief in 4 days. Hats off to those hams. Freq was 7070kc, and ecolink , VHF etc were used. Hope to hear and learn from their experience for disaster preparations.
***
It seems the SIARS-Chennai , also have its own view. Will collate it after they speak it loud.
***
Personally I have no bias, I welcome all the voices pro-con and others. Life is multi-dimensional, if we have different views, viewpoints then better we understand the situation.

 IMHO we need hams who can interface with giant multi head  government on whom we depend for our joy. There are who really wants to work in field and shy away from all limelight. There are those who comes on air, there are those who just  tinkers.

It is a very expensive hobby. I have seen many persons who also developed other hobbies, numismatics, photo, tracking, mountaineering etc and survived the harshness of ham hobby.

So, ultimate aim should be enjoyment. Whichever way you find joy enjoy it.

Monday, October 19, 2015

Mobile Expedition

Here is write-up for my short expedtion on HF 14.315kc.
The following "image" inspired me to make my own experiments, which I was post-poning for sometimes.
vu2mau_7388_Small_Emergency Mobile
After hearing from the GJ1-CD-7388 mobile of VU2MAU. I was inspired. Why I also don't put the receiver on my bike.

As I did not want to be big eye-catcher and explain to the public and police what and why I have put antenna on my bike ??? he he. But, first time I took my original license with me to make them understood in case I find some idiots.....

So I took a 1 meter telescoping antenna, put it onto the small direct conversion receiver. See my blog for xtal controlled ra3aae poliakov 20 meter receiver. I used three 4.4 volt battery to arrive at 12 volt. So receiver was ready,concealed into a cloths carry bag I checked signal upto 6 km. It clearly gives me the beep beep on 14.315kc. Wow ! tx was pumping 20 watts, antenna was dipole, I did not care for SWR. It should be around 2.7 to 3.0 a very high but okey for me. It was a very nice experience. Almost at all places the signal report I gave was 55 to increasing into 59 at one heigh place and near my qth... So, good experience. I will make proper quarter wave antenna and another direct conversion receiver with good gain.... will see how far my ground wave goes. This auto-beep for testing is the penalty for being lonely and only hams....

If I make the 40 meter transmitter 7059kc and test them, its possible that I might reach my friend at 100km with 20 watts.. Waiting to hear from other friends what is their experience with vertical antennas for mobile use.....

10 December 2015
I find this article very useful... have a look for portable antenna.... http://www.zerobeat.net/g3ycc/yccwhip.htm 

Saturday, October 17, 2015

HFI2015_part2

My QSL card
for the eye-ball QSO. I will be just making a stamp.... EYE-BALL QSO, HFI2015 @ Rajkot, VU3INJ  and that's it.

FOR SALE
I will be selling few damaged gears please ask me about it.

1. Marine receiver ---5500/- (call up in advance as its a big and heavy item)
2. DR139 VHF bases station 50watt ----5500/-
3. LRR-40   receiver---- 2350/-
4. Few miscelenious items.

All items as it is. Working / Non working, inspect then buy.

GIFT
For gift one is pending at HFI2015, one ham needs to be given cw tx i.e 7.159/14.318 MHz 5watt CW linear... Making it hope to finish it soon.

ON AIR
If my 20 meter transceiver after repair comes I will be on air with it soon. Otherwize, it will be xtal controlled only.

I have been cheated. My original exciter board is given to others and inferior board is given me back. It lacks quality. Linear does not produce enough power. So, finally end of being on air dream.

OFF AIR & CLUB
Sayonara

Facebook
I will be closing the facebook account after HFI2015. So, if you want to download any pictures etc from my facebook profile please copy/download.