[amsat-bb] Re: Adding a Pre-amp to a standard tranciever

[Michael Tondee]

My ARR preamp uses RF sensing circuitry and a  relay to switch itself 
out of the line when transmitting. It's good to 160 watts. I know that 
this isn't what you want but it seems to me that there is still a way to 
employ a sequencer with it for other applications. I got literature with 
it that stated as much, although I can't place my hands on it now. One 
thing I will mention is that if you wish to power an ARR preamp through 
the coax, you have specify this to them when you order it. They then 
install the necessary parts at the amp end. Otherwise it's designed to 
be powered seperately through a military spec. connector which they 
supply. Don't know if this helps but since I have your example brand of 
pre-amp I thought I'd chime in.
73,
Michael, W4HIJ

> At 11:35 PM 2/3/2007 +0000, sraas at optonline.net wrote:
>   
>> I am considering my next station upgrade to be mast mounted preamp(s). I
>>     
> prefer the NON R.F. switching type due to their general better
> performance/cost and leaving me the ability to run QRO is need be in the
> future. 
>   
>> My only experience is using a preamp with a transverter where there are
>>     
> seperate RX and TX lines. Now I do fully understand that you cannot TX
> threw these devices. My radio DOES have the ability to send DC voltage
> threw the coax while recieving ( IC 820H ). Even tho the radio can do this,
> I just dont understand how it works or if I would still need to use a
> sequencer. And even at all that... how an ARR preamp ( example ) can pass
> any sort of RF. The only way I can see how it would work is if some sort of
> switch is inplace @ the antennas as well, the DC from the radio or
> sequencer switches the preamp IN place when RX'ing and OUT of place when
> TX'ing. 
>   
>> Now if this is indeed the case.. and im going to assume it is.. where
>>     
> would I begin to look for a Coaxial Relay that can pass 1kw @ 432 / 144
> mhz? Now I know your thinking HU? 1KW!!! This is not my intended power
> level for the sats.. dont worry.. its for ( in the future ) possibly trying
> some single or dual yagi EME. 
>   
>> -Steve Raas
>> N2JDQ
>> FN20vg
>>     
>
>