Tim,
I have a two meter repeater that outputs 250 watts (approximately +54
dBm) into the duplexer. After the 93 dB of rejection that the duplexer
provides for shear power reduction toward the receiver port, -39 dBm of
transmitter power leaves the duplexer receiver port - headed toward the
Hi Kevin,
Thanks for the info. I've used the PLL MastrII exciter on a couple of
systems also.
Now, since this duplexer is of the 'notch' variety, I already have about
100db of notch (on the TX side) that is tuned to the RX freq. Shouldn't
this be enough?
Tim
With 250mW (+24dBm) into the transmit port... antenna port is
a quality 50 ohm load, I see -72dBM at the receiver port. (pretty
much what I expect.. 1.8dB loss through the xmit side, 100dB
notch through the RX side.
Those numbers are fine.
With it all hooked up receiving an input signal
AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Repeater transmit levels at the receiver?
Tim,
I have a two meter repeater that outputs 250 watts (approximately +54 dBm) into
the duplexer. After the 93 dB of rejection that the duplexer provides for
shear power
Hi Jeff,
Thanks for the reality check... loved the real-world example of
the mobile unit.
At this point, I'm leaning towards the bad mojo/karma phase
of the moon!
Got a 'spare' set of low-band cans that need to be stored somewhere
it's warm? :-)
Thanks,
Tim
feet
tall.
73, Eric Lemmon WB6FLY
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Jeff DePolo
Sent: Friday, July 30, 2010 7:30 AM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Repeater transmit
Tim wrote:
Hi Kevin,
Thanks for the info. I've used the PLL MastrII exciter on a couple of
systems also.
Now, since this duplexer is of the 'notch' variety, I already have about
100db of notch (on the TX side) that is tuned to the RX freq. Shouldn't
this be enough?
Yes, 100 dB of
On 7/30/2010 10:15 AM, Kevin Custer wrote:
Tim wrote:
Hi Kevin,
Thanks for the info. I've used the PLL MastrII exciter on a couple of
systems also.
Now, since this duplexer is of the 'notch' variety, I already have about
100db of notch (on the TX side) that is tuned to the RX
Larry - I didn't.
The 250 watts is produced by a GE MASTR Pro/II 4EF5A1 capable of 330
watts continuous. The MICOR high-band tube amplifier, IMHO, is junk
compared to the GE 4CX250R based VHF power amplifier. The 4EF5A1 is
designed to operate from 144 to 174 MHz. without modification.
Hi
as do most european 6mtr repeaters, 500Kc split
73
Steve
- Original Message -
From: Eric Lemmon wb6...@verizon.net
To: Repeater-Builder@yahoogroups.com
Sent: Friday, July 30, 2010 3:57 PM
Subject: RE: [Repeater-Builder] Repeater transmit levels at the receiver?
Jeff,
You did
Hi Tim
it should be plenty, what about the notch on,the rx side, which
I assume is tuned to reject the tx freq.
Steve
- Original Message -
From: Tim tahr...@swtexas.net
To: Repeater-Builder@yahoogroups.com
Sent: Friday, July 30, 2010 4:42 PM
Subject: Re: [Repeater-Builder] Repeater
Hi Steve,
Both sides are exhibiting pretty much the same specs - about a 100dB
notch (each side tuned to the opposite freq), and about 1.5dB attenuation
at the desired freq.
All cables are new RG142.
Something's gotta be bad wrong if a 250mW input on the TX side will
make noise.
Using the
@yahoogroups.com
Subject: Re: [Repeater-Builder] Repeater transmit levels at the receiver?
Larry - I didn't.
The 250 watts is produced by a GE MASTR Pro/II 4EF5A1 capable of 330
watts continuous. The MICOR high-band tube amplifier, IMHO, is junk
compared to the GE 4CX250R based VHF power amplifier
Hi Tim
that should work fine, very strange. As a matter of interest how far
apart are the tx and rx units and I take it all the covers and screening
cans are fitted..
Steve
Tim wrote:
Using the Micor's exciter - about 270mW. Cannot see any spurs/noise
within 80dB of the main carrier.
I wonder Most of the MICOR exciters I have converted to 6M
result in more than 270 mW of power - in fact, 400 to 600 mW is
common. I wonder if something is amiss at the
Actually, the output is about +26dBm, so it's closer to 400mW.
I've also tried a VX-5 on low power, and got the same result.
Tim
On 7/30/2010 9:52 AM, Kevin Custer wrote:
Tim wrote:
Using the Micor's exciter - about 270mW. Cannot see any spurs/noise
within 80dB of the main carrier.
I
Hi Kev
would it be feasable to use a sig gen cranked right up ?
Steve
- Original Message -
From: Kevin Custer kug...@kuggie.com
To: Repeater-Builder@yahoogroups.com
Sent: Friday, July 30, 2010 5:52 PM
Subject: Re: [Repeater-Builder] Repeater transmit levels at the receiver?
Tim wrote
Agree on the MSTR PRO 4EF5A1. Had one in service on the amateur band (VHF HI)
and it ran withoout a burp for 8 years. Would like to find another one to use
with the MASTR II.
David
Jul 30, 2010 03:39:08 PM, Repeater-Builder@yahoogroups.com wrote:
Larry - I didn't.
The 250 watts is
You did an excellent job of explaining the complex
interrelationships among
2m repeaters. However, not all 6m repeaters have a 1 MHz split; my 6m
repeater on Tranquillon Peak follows the California band plan
and has a 500
kHz split. The duplexer has four cans about 12 in diameter
and
At this point, I'm leaning towards the bad mojo/karma phase
of the moon!
Let's start out with the basics:
1. How much desense do you have?
2. How are you injecting the Rx signal, and what are you using for the
signal source?
3. What are you using for a dummy load when doing the desense
Steve wrote:
Hi Kev
would it be feasable to use a sig gen cranked right up ?
Depends on how clean the signal generator is. I'd think it doesn't have
enough smoke (output capability) to really be beneficial
Many generators have a strong carrier (here we go again) adjacent from
the desired
Tim wrote:
Actually, the output is about +26dBm, so it's closer to 400mW.
Good - that's more like it.
I've also tried a VX-5 on low power, and got the same result.
Obviously, something is wrong with the operation of your duplexer or
interconnecting cabling. I really don't think it's
: [Repeater-Builder] Repeater transmit levels at the receiver?
Steve wrote:
Hi Kev
would it be feasable to use a sig gen cranked right up ?
Depends on how clean the signal generator is. I'd think it doesn't have
enough smoke (output capability) to really be beneficial
Many generators have
] Repeater transmit levels at the receiver?
Steve wrote:
Hi Kev
would it be feasable to use a sig gen cranked right up ?
Depends on how clean the signal generator is. I'd think it doesn't have
enough smoke (output capability) to really be beneficial
Many generators have a strong carrier
I wonder how many of the -53 naysayers have or have used a Cushman
CE-3? LOL! The folks that have looked at the output of one of
these on
a spectrum analyzer will get it.
K
Where I come from, we call that a comb generator, not a signal generator...
Ya gotta know the limitations of your
Sounds like someone has been watching The EnforcerMr
Eastwood.every man has got to know his limitations?
Soory could not resist!!
D
On 30/07/2010 22:35:35, Jeff DePolo (j...@broadsci.com) wrote:
I wonder how many of the -53 naysayers have or have used a Cushman
CE-3? LOL! The
Hi Kevin,
Yes, the original used RG-58.. couldn't see using it. Figured
it would give me desense!
As far as the amount of notch, I was surprised that the total
was more than each one added, but with 50 watts
coming out of the antenna port, I see -55dBm at the RX
port. - kinda made me think the
Tim wrote:
Hi Kevin,
Yes, the original used RG-58.. couldn't see using it. Figured
it would give me desense!
As far as the amount of notch, I was surprised that the total
was more than each one added,
Don't be - it's common for the apparent notch to be deeper than the
measured addition
Hi guys,
Took some time away from the project... loosing too many hairs.
Ok, I've gotten another receiver strip, and it has the specified
sensitivity per Mot.
Guess I want to bounce some ideas around with those of you
who are more learned in the arts!
With 250mW (+24dBm) into the transmit
On 7/23/2010 10:34 AM, tahrens301 wrote:
Hi folks,
Still working on the hardline duplexer for 6 meters, and have some
data I'd like to run by you guys.
Running 80 watts out of a Micor tx into the TX bank of cavities. With
test equipment, get about 100dB notch. (shows 50 watts into
Ok, now I hook the spectrum analyzer up to the receiver port,
and I see
about -55dBm. 50 watts = +47dBm, minus the 100dB notch =
-53dBm that is pretty close to what I'm seeing at the rx antenna port.
Question is: Should this good enough for a low band micor receiver?
Thanks,
Tim
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