[TowerTalk] ICE devices for Beverages

[Roger]

Hi TowerTalkians,

I am building a Beverage. I visited http://personal.isla.net/ice/ and I 
read the specifications of the devices that ICE offers. I could not decide 
between ICE Models 180A, 181A and 184A. I already understood the basic 
differences but I still have some questions. I sent several E-Mails to ICE 
but never got an answer. So I am posting here some Questions. Perhaps some 
of you can give an insight.
TIA
73 Roger - PY1OL
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Notes
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#1: I read that Model 180A accepts both 50 and 75 Ohms feedlines. I could 
not find this information about Model 181A.
#2: From what I read, Model 181A allows one to apply a DC voltage into the 
Beverage for remote switching. This part is not clearly explained in the 
texts so I could not fully understand this feature. I want to evaluate this 
feature and decide whether I should buy 180A or 181A. I can think of 
something to change the main lobe of the antenna by using relays, but I 
can't see how a single 181A takes part in such a system.
#3: Model 184A is a Model 180A (which is a DC blocking unit) plus a filter 
plus a preamp. So, 184A is clearly more useful than both 180A and 181A, BUT 
it is DC blocking!

Questions
---------
#1: Does Model 181A (DC passive unit) accept both 50 and 75 Ohms feedlines too?

#2: Could anybody suggest a practical example, mentioning wires, devices 
and components, where advantage is taken from the fact that 181A is DC passive?

#3: Supposing that I may ever need the DC passive feature, I shall not buy 
Model 184A. Does ICE offers another version of 184A which is not DC blocking?

#4: It is strange that ICE does not reply to E-Mails. Is ICE out of business?
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