Fri, 19 Mar 1999 19:01:51 -0500
Hello Tacos gang,
Roland W4WOI , the person who wrote the below message, will be joining us at
Tacos this Saturday, and then will come to Paul Rinaldo's office afterwards
to give us the benefit of his experience.
This promises to be mighty interesting
Please join us and welcome him
ROLAND N RICHARDSON wrote:
> I am one of the few with experience with the design, building and
> operations of The NSS, the NPM, the NAA when they were aprox 500 KW and
> instrumantal in upgrading some of those to 2 MW,
> I also built LCU in Norway a 100 KW transmitter serving as NATO north,
> ran POP test on I2RO in Italy, NWC in Australia. LCU could be retuned
> from any freq between 30 and 140 KHz to any other freq within 30 to 140
> KHz, within 30 seconds. We were under specs from NATO to do it in 2
> minutes, sometimes things go right.
> Used a lot of vacuum capacitors and vacuum switches.
> I have suitable vlf receiving equipment to definitively compare received
> vlf signals. The equipment has served with me in making POP (Proof of
> Performance) measurements on ELF, VLF and LF stations. It is a well known
> piece of equipment and with it I use the shield injection method of
> determining the actual microvolts per meter signal level of received
> signals. The equipment is the NM-6 system with 31 inch (1 Meter) enclosed
> loop. The loop has 11 turns and with it is antenna factor which I can use
> but I find the loop shield injection method much easier to use,
> understand and get repeatable data with.
> I would like to view your program and participate within if I can. I
> would need such information as; Freqs, times of operations, type of
> signal, and could use the tangential measurement system if AFSK, FSK,
> RTTY and other types of digital data is to be used. Much more accurate
> data can be obtained with ON-OFF CW transmissions. By operation the test
> transmitters ON-OFF allows the measurement of the NOISE while the
> transmitter is OFF. The amount of noise of these frequencies is important
> to the S+N/N. The noise part of received signals can only be evaluated
> using tangential measurements.
> As I am an 81 year old VLF engineer my movements are somewhat limited.
> The equipment I have is old but has been maintained in excellent
> condition, it has been calibrated many times but not recently. Since all
> signals are gained from the shield injection signal generator which is a
> AN\URN-25 calibrated last in 1992 by Westinghouse
> Cal Lab. I have confident is my Systems. I retired in 1992 at age 74 and
> am still mentelly active.
> 73s de Roland N. Richardson
> 9502 Sweet Grass Ridge
> Columbia, MD. 21046-2008