Total posts : 45366
i’m convinced there is more going on here than we are being told in the case of mighty1650. Gerry, i just don’t know what to speculate about that (without knowing if he was infact using an unmodded standard TH) and will have to wait for Bill & Dan to complete the investigation. given that i will try to speculate what could cause a reading of 1.8mV @ 175m.
as i stated earlier it will all soon come out and we will have the agent(s) side of things as Radio Systems / Dan is in contact with the FCC about these situations.
It’s just a wait game.
below is speculation (calling rich / Ermi / niel to verify or correct my assumptions)
Gerry was, (so far as we been told), using a standard TH-V with it’s wire antenna. if that is the case regardless of any field readings that inspector got should have passed inspection under 15.219 unless there were appearances of modification or tampering with the unit in question. a reading of 1.8mV @ 175m is (in my opinion) possible if there is capacitive coupling between the 3m monopole and unshielded AC wiring in the building and the building is of wood construction. in short the AC wiring could act like a very large capacitively coupled shunt fed cage monopole and could get some interaction with other nearby buildings AC wiring creating a large directional array. is this scenario likely? possibly, possibly not, but stranger things have happened. at these wavelengths funny things happen that we can’t easily predict with a slide rule and protractor this is why the FCC still requires proof of performance measurements of AM arrays because anything can interact with an AM monopole and throw off it’s pattern. the same goes (probably even more so) for these extremely electrically short monopoles. any nearby metal can reradiate or interact with the antenna system and there is nothing a user can do about it. if the FCC came across a stock un modified TH with a valid FCC certification installed per the manual then said installation should pass. that is my take on things. 1.3mV @ 175m is what a good ground mounted monopole over a grounbd plane can produce so 1.8mV is not that far off if the scenario i laid out here did indeed happen in gerry’s situation. the FCC also requires (under 15.207) condicted limits on the hot and neutral lines for intentional radiators getting their power from the public utiltiy AC grid. as such an inspecting agent should not conisder the AC grid as part of the ground lead under 15.219. these are limits not total isolation making my scenario posed here that much more likely. fact is the FCC OET lab passed the TH system (manual, ATU, and TH) and barring (as i stated previosuly) appearance of modifcation the agent in gerry’s case should have accepted the certification and gave gerry a pass. it does not matter all this will come out in due course. we may even find out that Gerry did in fact modify his TH and that there was outward appearance of modification, who knows, just another bit of speculation on my part, point is till Bill, Dan, RS complete their investigation it is all that speculation
make note: i concentrated on Gerry’s case because from all outward appearances Gerry’s case (if he was in fact using an unmodded standard TH) should have passed and it will be likely that Gerry can return to the air (if he was in fact using an unmodded TH) after all this is completed. mighty1650 on the other hand has admitted to pirating on FM which led to the original inspection and confiscation. that pirate activity on FM tainting his entire operation in my opinion and is likely what led to total confiscation of all his transmitting gear.
this is my take on these situations but the truth will eventually come out.
hopefully sooner rather than later but all we can do is wait it will take however long it takes.
i have sat back and neglected to comment till now but felt i needed to comment and stress this is all speculation and is only two incidents out of thousands with one having the taint of pirate fm activity.
if you are an TH owner (and concerned about these recent events) and wish to be updated but do not wish to be a member of HB.net than i suggest contacting RS Global and politely and calmly stating your concerns and ask that you be updated as info becomes available.
otherwise lets keep all the speculation to a minimum please till RS/Dan complete their investigation. no good can come of speculation.
I personally want to hear the Agent(s) involved side of these two cases before passing judgement on (and condemning) the agent(s) involved.