No, that black coax is plugged into the normal connection when no preamp is installed, the preamp would be in the hole/area to the left of that RCA termination you have now, you do NOT have a preamp in that mobile.
73 Don W5DK From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Thursday, October 18, 2007 7:50 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] MASTR II I guess it would be helpful if I gave more detail on the repeater. It's VHF and its built on a mobile MASTR II. Here is a picture of it. http://www.highwayusa.com/mastrII/mastrII.jpg Is the block that the recv port is pluged into a preamp or is that the normal place for it to plug in? Thanks, Vern On Thu, 18 Oct 2007 03:03:27 -0600 Nate Duehr <[EMAIL PROTECTED] <mailto:nate%40natetech.com> > wrote: > > On Oct 17, 2007, at 7:26 PM, [EMAIL PROTECTED] <mailto:no6b%40no6b.com> wrote: > >> The P1dB point on the UHF UHS preamp I measured was only >>+1.5 >> dBm. However, it's much narrower than any standalone >>preamp you >> can buy >> off the shelf, so it has some inherent out-of-band >>rejection. I >> measured a >> noise figure of 4.6 dB, which sounds a bit high but it's >>a LOT >> lower than >> the noise figure of a stock UHF GE MVP/Mastr II/Exec II >>RX. I just >> installed a VHF UHS preamp in my latest 2 meter >>portapeater & am >> very happy >> with its performance so far. > > By the way, for a photo of a UHF UHS pre-amp, or if >you're looking to > buy one -- assuming this one is working -- there's one >on eBay right > now... > > <http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem <http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=300160564470> &item=300160564470> > > It's a UHF "88-split" version. > > As you can see, it's just a little square-shaped board >that installs > in the "hole" to the right of the receiver's RCA input >connector, if > you're looking at the receiver with the helical casting >and coils to > your left. > > The RCA connector on it is your new "receiver/antenna >input", and the > little cable and male RCA goes over to the receiver >input. The > little red wire in the photo is to get power into it. > > -- > Nate Duehr, WY0X > [EMAIL PROTECTED] <mailto:nate%40natetech.com> > > >
