Simplex VHF Communication Test
New Delhi NCR

HAM Radio Station Location New Delhi NCR on Google Map

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On 20/12/2009 at 21:00 Hrs New Delhi witnessed a Simplex VHF communication Test exercise, In which 25 local HAMs ,1 long Distance HAM and 1 HAM on Echolink had taken part.
This type of communication test was due for quite some time and HAM Radio operators in Delhi were thinking of conducting this exercise to generate interest in VHF activity and also to test the communication possibility between HAM Radio station located in and around Delhi considering the fact that in case of emergency / disaster the local VHF repeater may not work or will be overloaded. VU2OEC om Rajesh from Gurgoan called on the local HAMs in Delhi NCR and 20th of December was finally decided for this test.

Simplex VHF Communication Test

• Date: 20.12.2009
• Time: 21:00Hrs to 21:30Hrs IST
• Frequency: 145.200MHz simplex
• Area: New Delhi NCR
• NET Control Stations: VU2OB om Shree and VU2XLZ om Frank
• Objective: To see and check the simplex VHF communication between HAMs in and around Delhi NCR with signal and working condition reports exchanged and logging by all stations.

The test started little before 21:00Hrs and the alternate NET control Station, VU2XLZ om Frank initiated the exercise by taking a roll call of the stations who were present on frequency at that time.

The Stations who took part in the exercise are: 1.VU2XLZ,2.VU2ANM,3.VU2KD,4.VU2LAS,5.VU2OB,6.VU2YEP,7.VU2OEC,8.VU2XD,9.VU2ORO, 10.VU3FUN,11.VU2ATN,12.VU2GTI.,VU2GHT??(MYSTERY STATION),13.VU2DED, 14.VU2VTH,15.VU2LRL,16.VU3ORN,17.VU3DJQ,18.VU2RAK, 19.VU3CAV,20.VU2BDX,21.VU2EXX,22.VU2UKR,23.VU2YAP,24.VU2MUE,25.VU3BSE,26.VU2YK.

VU2OB om Shree was designated the main NET control station and he started the process of calling stations and exchanging reports in terms of signal received and the working conditions.The test exercise lasted for almost 40 mins and once the testing on simplex 145.200 MHz was over, all stations QSYed to Delhi VHF repeater VU2DLR frequency i.e.(145.600MHz with -ve shift) for the evenings VHF NET.In all the simplex VHF communication test was a great success and thanks to all the participating stations.

Some highlights of the test were:

• Mystery Station GTH. Can any one identify this station?
• Majority of the stations copied each other with a reasonable signal strength report.
• VU2MUE om Sandeep who was operating a mobile setup from Mussorrie, more 250 KM, was copied only by VU2RAK om Rakesh(59) , VU2YK om Rahul and VU3DJQ om Raman(51).
• VU2KD(West Delhi) om Sofi tried with LOW power 0.5W copied by VU2EXX(59),VU2YK(51)
• VU2YEP om Karan(West Delhi) tried with a Handy talkie 1.5W and a telescopic Whip antenna on top of the QTH roof. He was copied by VU2XLZ(53),VU2OB(Noisy),VU2EXX(59),VU2ANM(55),VU2ORO(51),VU2YK(52),VU2ORN(51).
• VU3DJQ om Raman (North Delhi) on low power was received by VU2XLZ(51),VU2YEP(58),VU3CAV(42),VU2GTI(Breaking SQL).
• VU2ORO om RON (Indirapuram, East of Delhi) and VU2EXX om Pradeep(West Delhi)were the stations who have received maximum no. of 59-59+ reports of other stations at their respective QTHs.
• VU2BDX om Bharat(Gurgaon) had the maximum no. of "No Copy" of other stations in Delhi NCR.
• VU2YK om Rahul was the station with maximun no. of 59-59+ signal copy reports from other station in Delhi NCR.
• VU2OB om Shree (Central Delhi) was the station that copied maximum no. of other station with noise.
• It was very interesting to know that VU3CAV om Rajni was in his mobile setup of his car, using 5/8 antenna and Alinco DR130 rig and was copying station from that mobile setup.

Recommendations / Suggestions for next exercise:

• The NET control station should be the one who can receive maximum station all around Delhi NCR.
• The transmitted power from all station should be same i.e. 5 Watts for the test to be uniform.
• The test should be conducted in morning as well as evening time on same day to check the propagation conditions.
• The technical analysis of the next test should include HAM Station's Radio "foot print" with reports exchanged on trying different power levels and see how far the signal on various power level is received.
• This type of simplex communication test should be conducted atleast once in every three months time.

Given below is the compiled Excel sheet Grid of all the station. Only the stations who have submitted the reports till 25.12.2009 of the other station as they were received at their respective ends have been included. Top to bottom are the Main list of stations and from left to right, across is the respective signal reports received by the main list stations at their QTH.Click On the image below to view the file.

Download the above file  - Download (49.0 kb).pdf format

Given below is the table of signal reports as in terms of No. of stations received with a particular signal strength.

Listen to the Live Recordings for the Simplex VHF communication Test exercise on 20.12.2009 as received at VU3FUN / VU2YEP Stations, location: Janakpuri, West Delhi. : By IndiaHamS.com

Please Note: That the following recordings are representation of a simulated Simplex VHF Communication Test in a event when the VHF repeater fails or is not available for use. The objective of this Test was for making awareness among HAM community and to check the communication between various HAM Radio stations located in different area of Delhi NCR.The communication test do not serve the purpose of education or training on emergency traffic handling, therefore these recording should not be used as representation of actual emergency traffic handling by HAMS.

Click on the Green Colored Play Button below to listen to the files (In mp3 format)

File-1   File-2

File-3   File-4

File-5   File-6

File-7    File-8

File-9   File-10

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Please Note : The contents on this article are copyrighted by their respective owners. No reproduction or modification without written permission from VU3FUN : This e-mail address is being protected from spambots. You need JavaScript enabled to view it