[ICOM] R7000 dumb question of the day

[crawfish]

I wouldn't assume that there is a blocking cap. I would install a 2 pF
coupling cap from output of amp to input of radio to keep the DC out for
sure.
                                Joe W4AAB
----- Original Message -----
From: <Bonddaleena at aol.com>
To: <icom at mailman.qth.net>
Sent: Wednesday, November 30, 2005 7:05 PM
Subject: [ICOM] R7000 dumb question of the day


> Hello. I've been having a lot of fun with my 'new' R7000. I use it with an
> RS discone (until I get my towers up) and for 50-900 Mhz, I use a Channel
> Master TV preamp, which works really well.
>
> I was in Lowe's today, and noticed they had a VERY small preamp for 900
Mhz
> to 2 Ghz, for $16. 13 db gain claimed.
>
> My question is this:
>
> It is a 'power through' model. No power connections available. Obviously,
> they send 12 VDC up the coax to power it. I assume it would be easy to put
a "T"
>  connector before the preamp and supply it with 12 VDC via a small choke.
My
> R7000 service manual is on the way, but am I to assume that providing 12
VDC
> to  the input side of the preamp will also place 12 VDC on the ant
connector
> of the  R7000? Am I also correct in assuming that the R7000 will have a DC
> blocking cap  early in the signal path, after the antenna connector? I
sure don't
> want to put  12 VDC into the radio and 'smoke it'. I was going to put a
low
> voltage ohmmeter  on the N connector, but with my luck, I'll take out the
front
> end of the radio!  I have noticed that the IF output, has a DC voltage
> superimposed on the 10.7 Mhz  signal.....
>
>
> thanks in advance!
>
> ron
>
> N4UE
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