Home |
Search |
Today's Posts |
#1
![]() |
|||
|
|||
![]()
Hello:
I am looking words of advice on conducting an informal exercise to evaluate performance of 75m mobile systems. I have done much reading of rec.radio.amateur.antenna threads and have learned much from Cecil, Reg, Keith, Roy, et al. The msg threads addressing how measurements were taken during past shootouts have been very helpful but equipment used in those events seem to be beyond my capabilities. I am part of an ARES/RACES HF Mobile team. We are in the early stages of assembling our team and have conducted a couple of field exercises. I believe I adequately understand many of the issues related to operating 75m mobile and have concluded (from assessing our mobile configurations) that our systems are VERY compromised. As we conduct our EmComm field exercises we take the opportunity to experiment and make system adjustments that clearly improve performance. Primarily we are using 100w mobile hf rigs with 75m Hamsticks or Hustler resonators. We understand that the vehicle, the antenna, the ground, etc comprise the "System". One important note is that we are not focused on achieving DX communications. Our field of operations is primarily Groundwave within a tri-county area in Eastern Pa (many 600-700 ft ridges and valleys, heavily forrested), perhaps 100 miles max. We do use and experiment with NVIS (using restricted space configurations: tilted whip, Hamstick dipoles, etc) however, this query is relative to Groundwave. I would like to add an occassional field exercise expressly for the purpose of measuring the performance of our systems (for improvement and detecting problems). We currently have no equipment for this purpose. One device I see advertised and would like some feedback on, is the MFJ-802 Field Strength Meter. - Would the MFJ-802 be an adequate measuring device for our use ? Any caveats ? - What test FIELD environment should we try to arrange (e.g. large empty parking lot, or a rural open field) ? - When testing each vehicle, what space should separate it from other vehicles waiting to be tested ? - Should the vehicle sit stationery, or be moving in a circle ? Any suggestions offerred to assist with this effort will be sincerely appreciated. regards, Dennis, K1DRW |
Thread Tools | Search this Thread |
Display Modes | |
|
|
![]() |
||||
Thread | Forum | |||
Advice on 2 Meter Mobile | Equipment | |||
FCC: Broadband Power Line Systems | Policy | |||
Calibratable Field Strength Meter? | Homebrew | |||
Calibratable Field Strength Meter? | Homebrew | |||
a page of motorola 2way 2 way portable and mobile radio history | Policy |