OK on RS amp. That is why it has laid on the shelf for so long. A
preselecter is Motorola's term for their internal preamp. It has 3 to 9 db
of gain and they have tunable pass notch in them to narrow it to freq. your
on. They are usually not very good for broadband window.
I have never heard mini circuit company, I'll have to check them out. Alot
of people on here refer to them.
Thanks, Bruce KD4BOH.
----- Original Message -----
From: "Al Wolfe" <[EMAIL PROTECTED]>
To: <Repeater-Builder@yahoogroups.com>
Sent: Thursday, August 04, 2005 9:23 AM
Subject: [Repeater-Builder] Re: receiver combining
> Bruce,
> I don't think you will be happy with an amplified splitter from Radio
> Shack. Your concept is valid but the RS amp will probably have much too
> high
> a noise figure to be useful for off the air use in repeater service.
> I would be leary of any Radio Shack device hooked to an outside
> antenna,
> especially around a repeater site where you have frequent lightning
> currents
> to deal with.
> Not sure what you mean by preselectors in front of the Micors. Why do
> you need them? Are you talking about a duplexer? Micors are generally
> pretty
> bullet proof by themselves. You probably will want some sort of
> pre-selection between the antenna and any preamp. The DCI Bandpass filters
> work well for this.
> I have had good luck with the AAR preamps. Others swear by Angle
> Linear.
> As far as jumpers from the splitter to the receivers, it probably makes
> little diference as to what impedence to use. If you are using a TV type
> splitter then it is probably easier to use a quality 75 ohms cable with
> the
> "F" connectors. Since this is a receive set up and you won't be
> transmitting
> through them, you can and should use the 100% shielded coax for the
> jumpers,
> the most common being foil shielded. You should be able to use any
> practical
> length for them. Please don't use the foil shielded coax for any duplex
> operations, though.
>
> 73,
> Al, K9SI
>
>
>> Date: Thu, 4 Aug 2005 02:06:45 -0500
>> From: "Bruce Nanney" <[EMAIL PROTECTED]>
>> Subject: Re: Re: receiver combining (Was Digest Number 3263)
>>
>> OK Al, I am using 75 ohm split on two Micors with a preselecter on each.
>> Seems to work rather well. I bought a CATV 10 db adjustable gain splitter
>> from Radio Shack several years back and converted it to 12 volt to run on
>> battery back-up, but never had the need to use it till now. Sounds like
>> we're along the same thinking on this.
>> So we take the preselecters off the Micors, put on the RS 4-way splitter,
>> gain set to over come loss. What about jumpers, 75 or 50 ohm ? Does it
>> really matter, and do they need to be 1/4 wave length of the freq. they
>> are
>> hooked to ? Thanks, Bruce KD4BOH.
> <snip>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/Repeater-Builder/
<*> To unsubscribe from this group, send an email to:
[EMAIL PROTECTED]
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
