ગૂફતગૂમાં રાત ઓગળતી રહી;
ને શમાઓ સ્પર્શની બળતી રહી.
સ્વપ્નમાં એકાંતનો પગરવ હતો;
રાતરાણી ગીત સાંભળતી રહી....

Pulser, Criket

        Sometime during the testing phase of tx it is requied that it be keyed on and off to tune it. If we key with one hand try to tune the prototype it become impossible. So, some sort of cheap repetating keying device is needed.

       An Astable multivibrator comes to the help. A transistor can switch on the relay and relay can control the PTT or CW tx.

     The tx during the experimental  build stage should  not be connected to the radiating antenna. Tx should be connected to the dummy load and if signal is required a small  1 foot wire may be connected to dummy load and hope that will produce the sufficient signals in near by radio.

1. Cricket:-

cricket, produces pulsed audio train

This is oscillator circuit which produces the af tone. q3-q4 is a AF osicllator. q3 is switch which provides the power supply to audio oscillator according to the low frequency multivibrator based on q1 and q2. 

audio output is taken from c5.

It does not key the transmitter. i use it on test bed to inject the audio to the dsb modulators and monitor the rf on comm. rx. so i dont have to say "hello test hello test". it produces the tick tick sound like a cricket so thats name. q1-q2 are bc547, q3,q4,q5 are bc557. c1,c2 are 10mfd,25volts. c3,c4,c5 are o.1mfd. it can be powered from 12 vdc. Please not that due to pnp,npn power supply needs to be reversed.

Morse Code & Morse Key

                   My computers window operating systems become out of date and i was tired of constant upload/download of the windows operating system . It was using up my nets meagure bandwidth. There was also issue of non-compatibility of various local softwares.

To solve this head-ache i was running various OS system on 386 system and found that debian was the perfect choice for my needs. My old dot-matric printer also works on this. Only problem is that my scanner is not working with this due to some in-compatility issue.

I was missing the koch morse program. But i found out that there are few programs in debian repository ie. Koch Morse Train, Morse, Aldo, CW, Cwtoebook, cwtoebookgui etc.

CW is our legacy and we should be able to work, however we are needed for day to day work.

I had two morse keys out of Alang junk yard and one from Jamanagar during my days with AVPT, Rajkot's Radio Operators course. When i started learning the morse the buble was burst and new gdmss system came on the ship. so dropped the course but retained the morse key. From all my changing jobs and transfer of cities i finally have one morse key as shown above and it works fine.

vhf frequency

I am listening on VHF 2 meter, 145.500 Mhz. FM. If you pass by the city of Junagadh, Gujarat on National High way towards Somanath or Gir Forest, Girnar please give me a call. 09033695503.

Tiny 2, VHF Antenna

To receive something i made a dirty monopole. Cut out the braid of 1/4 (wavelength) portion wire and presto my monopole is ready to receive. I dare not to transmit. VHF receiver working. Set to low power mode.5 watt. My power supply does not permit me to operate more power.

GP from one source is 1200/- and from another friendly source it is 500/- . At present i dont have that much money to invest and for 100km straight there is no one to reply my cq call.

To my salvation comes the tiny2 and tiny3 antenna. I saw it on the website of www.qsl.net/w4sat/index.html. My friend vu2spf also reported that 3 elements may solve my requirement.

Withing 3 hours i built it. Actually i had everything available with me. Plastic boom, al tubes. machines etc. I bought one drillbeat and few 1.5 inch long steel nut-bolts. It is ready to fire.

VHF base station

I hope to procure one VHF base station and one mobile station. It will create a thing to showoff with local peoples. If i show something which according to them look nice and work may be they will be attracted toward the hobby.

If i show them my CW rigs it is just a jingle of tones and means nothing to their ears.

Few friends came for  eyeball qso but i did not have any working VHF on which i can give channel. I thought i need one vhf to work my nearest hams 100Kms in all directions i.e Rajkot, Bhavnagar, Jamnagar, Una and one at Somewhere in Gir forest. As being a single ham in city it will be a DX for me all these city.

I got one VHF. ALNICO DR-130 with 50w VHF single band only. Wow, i will be able to be touched. Welcome friends. Frequency, antenna not decided. I will be on a standard calling freq only.

DDS VFO

I am in the process of procuring the dds vfo based on AD8950.

i have copy cut paste the foto of vu3elr to see what my dds probably would look like.