Bob Dengler wrote:
At 2/23/2007 12:50 PM, you wrote:
With respect to using the GE MII mobile frame for repeater applications:
1. Can you say categorically that there is sufficient TX/RX shielding
to prevent any desense at any power level the conversion is capable of
operating?
In my
At 2/25/2007 12:04, you wrote:
Has anyone narrowbanded a Mitrek, MastrII, or Johnson PPL6060 with
Com-Spec's narrowband filter kits? Is it really worth doing?
I retrofitted a VHF HB Mastr II with the ComSpec filters a while
back. They definitely work. However, if your goal is to provide
Of course keeping in mind that most of the Ham Tranceivers being
sold have the Tx-Deviation cranked way up... Makes them sound
louder.
cheers,
s.
--- In Repeater-Builder@yahoogroups.com, [EMAIL PROTECTED] wrote:
I retrofitted a VHF HB Mastr II with the ComSpec filters a while
back.
[EMAIL PROTECTED] wrote:
You laugh, but with the use of Time Division Multiplex it may be
possible to transmit and receive on the same frequency in different
time slots. It may not be that far fetched.
73, Joe, k1ike
Technically, it's not full duplex when you do that. You transmit a
skipp025 wrote:
So would/should we actually call the below problem desense, blocking
or capture of the repeater receiver?
s.
Years ago an upside down repeater in New Mexico on the intertie using
PL access would regularly be de-sensed by one in Texas 300 miles away
in the spring with
Re: Icom IC-RP2210 Repeater Service Manual Available (pdf format)
[220 MHz Band]
I've scanned the entire Icom IC-RP2210 Repeater Service Manual
into pdf format and it's now available (free). I've emailed
Mike a copy and I suppose you can get a copy emailed from me
if it doesn't become
I raised this issue on this forum a number of months ago and got a variety
of responses from members aboard. The response below is from a design engineer
at Weinschel. I assume that Bird engineers would agree. It appears that,
unlike load termination ratings, there is no such thing as a
I am building a 440 portable repeater out of a pair of GM300 radios and
a Harris Alpha mobile duplexer.
I believe that I tuned the duplexer properly and it notches the xmit
signal by about 55db on the receive side.
Using my signal generator as a source, it takes about 10db more signal
to key
If your radio's FM dev is now +/- 2.5 KHz, it's already set up for current
narrowband standards.
Dick
- Original Message -
From: Coy Hilton [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: 25 February, 2007 17:50
Subject: [Repeater-Builder] Re: Narrowbanding
I THINK IT'S
At 10:34 AM 2/26/2007, you wrote:
I am building a 440 portable repeater out of a pair of GM300 radios and
a Harris Alpha mobile duplexer.
I believe that I tuned the duplexer properly and it notches the xmit
signal by about 55db on the receive side.
Using my signal generator as a source, it
Does anyone on the list know anything about GE TMX8712
I am told that it is a 800 mhz unit.
Will it convert to the 902-928 band
Thanks in advance.
Ralph, W7HSG
---BeginMessage---
I am building a 440 portable repeater out of a pair of GM300 radios and
a Harris
--- In Repeater-Builder@yahoogroups.com, Jim B. [EMAIL PROTECTED] wrote:
... Blocking-definitely
---
No.
What we are really talking about here is simply called co-channel
interference, not blocking which has an entirely different
On 2/26/07, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote:
Does anyone on the list know anything about GE TMX8712
I am told that it is a 800 mhz unit.
Will it convert to the 902-928 band
You will want to sign up for the AR902MHZ group here on YahooGroups.
Lots of information (and experts) there in
Re: GM300 Repeater with Harris Duplexer
Depends on which Harris Mobile Duplexer you're using. One version
is almost plug and play into the ham bands while another is not
such a great performer when used below say... 452MHz.
Are you using the Black Celwave Flat-pack or the more square grey
That's good info. However I would be a little cautious (unless it says so on
the attenuator) they may use a different wattage resistor in the front end
of some attenuators. Example: a 100 watt 20 db attenuator may have a 100
watt load in it. But a 3 db 100 watt attenuator may have a 100 watt load
skipp025 wrote:
Re: GM300 Repeater with Harris Duplexer
Depends on which Harris Mobile Duplexer you're using. One version
is almost plug and play into the ham bands while another is not
such a great performer when used below say... 452MHz.
Are you using the Black Celwave Flat-pack or
In a message dated 2/26/2007 12:48:00 P.M. Pacific Standard Time,
[EMAIL PROTECTED] writes:
That’s good info. However I would be a little cautious (unless it says so on
the attenuator) they may use a different wattage resistor in the front end
of some attenuators. Example: a 100 watt 20
At 2/26/2007 08:27 AM, you wrote:
Bob Dengler wrote:
At 2/23/2007 12:50 PM, you wrote:
With respect to using the GE MII mobile frame for repeater applications:
1. Can you say categorically that there is sufficient TX/RX shielding
to prevent any desense at any power level the conversion
Bypassing the relay shouldn't have an effect on the TX output
Z when not
TXing, as the final RF output transistor is going to look
like an open too.
Bob NO6B
But the open transistors would be at a different electrical distance away
from the duplexer than the open T/R relay was.
The duplexer is flat and black. I've found no references to the part
number on the web. It seems to tune ok to 444.3/449.3. Seems to have
about 2db insertion loss and 55db notch. I used a Tek 7L12 spectrum
analyzer, a Boonton 42 power meter, a HP 8640B as the signal source.
Seems as though
Cable is RG-142
No shield between the radios yet.
--- In Repeater-Builder@yahoogroups.com, Jim B. [EMAIL PROTECTED] wrote:
skipp025 wrote:
Re: GM300 Repeater with Harris Duplexer
Depends on which Harris Mobile Duplexer you're using. One
version
is almost plug and play into the ham
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