At 7/30/2010 12:31, you wrote:
>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
This IS with a dummy load on the duplexer & not your antenna, right?
Also what kind of antenna T is on the duplexer (SO-239 or N
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 addi
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 o
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!
Tim wrote:
Hi Kevin,
On the notch depth, using Wavetek 2410 for signal source,
HP 8590B spectrum analyzer.
Start @ 0dBm on sig gen.
1st 'can'. hook input to sig gen, output to SA. Using RG-142
with PL259s. Using a T at the can. Tune for minimum signal
display on SA. Hook up 2nd in series,
> 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
] 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
Hi
was just a thought, I use a Marconi 2015 with the synth unit and that
is pretty clean, be interesting to see what Tim,s problem is
Steve
- Original Message -
From: "Kevin Custer"
To:
Sent: Friday, July 30, 2010 9:50 PM
Subject: Re: [Repeater-Builder] Repeater transmit lev
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 prov
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 c
> 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
> 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
>
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
Hi Kev
would it be feasable to use a sig gen cranked right up ?
Steve
- Original Message -
From: "Kevin Custer"
To:
Sent: Friday, July 30, 2010 5:52 PM
Subject: Re: [Repeater-Builder] Repeater transmit levels at the receiver?
> Tim wrote:
>>
>> Using the Mico
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
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 th
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
ilder@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
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 Micor
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"
To:
Sent: Friday, July 30, 2010 4:42 PM
Subject: Re: [Repeater-Builder] Repeater transmit levels at the receiver?
Hi
as do most european 6mtr repeaters, 500Kc split
73
Steve
- Original Message -
From: "Eric Lemmon"
To:
Sent: Friday, July 30, 2010 3:57 PM
Subject: RE: [Repeater-Builder] Repeater transmit levels at the receiver?
> Jeff,
>
> You did an excellent job of exp
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.
Obta
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
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 o
nsmit levels at the receiver?
How many thousands of 2m repeaters are out there running 100 watts at 600
kHz offset without desense? Let's be generous and say they have 100 dB of
isolation in the duplexer. +50 dBm TPO - 100 dB = -50 dBm transmit carrier
hitting the receiver. No big deal. And th
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
l 30, 2010 6:25 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 f
> 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 sig
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
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
re
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 port.
> 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,
>
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
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 dummy load as
well).. have about 1.5 - 2dB loss throu
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