] Desense has me pulling my hair out! (Was
DB4060 Duplexer Cables
On Wed, 8 Oct 2008, Mike Besemer (WM4B) wrote:
These babies are looking pretty rough, Paul (et al). After one pass
with the synthetic steel wool and a wipe with isopropyl alcohol, I can
see that the copper plating near the open end
Mike,
OK, that makes sense re the 004/005 markings.
And OK on the knobs. That really messed with me at first. I thought
they were glued or something. It was only when I tried heating one
to see if the glue would soften that I found out it was solder!
I didn't have any trouble with the top of
On Wed, 8 Oct 2008, Mike Besemer (WM4B) wrote:
These babies are looking pretty rough, Paul (et al). After one pass
with the synthetic steel wool and a wipe with isopropyl alcohol, I can
see that the copper plating near the open end of the outer tubes is
nearly gone on two of the cans.
] On Behalf Of Paul N1BUG
Sent: Thursday, October 09, 2008 7:20 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Desense has me pulling my hair out! (Was
DB4060 Duplexer Cables
Mike,
OK, that makes sense re the 004/005 markings.
And OK on the knobs. That really messed with me
Yep.
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Gary Schafer
Sent: Tuesday, October 07, 2008 11:35 PM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Desense has me pulling my hair out! (Was
DB4060 Duplexer Cables
Hi Mike,
I am
At 10/7/2008 03:03, you wrote:
With the tee connector split and the TX side going into a dummy load,
there is no desense. If I reconnect the tee and go to the -8920, the
desense is back.
Make sure there's an isolator on the TX. I've seen severe desense using a
perfectly good, tuned duplexer
Just out of curiosity what power supply are you using? I've seen a
fair amount of RFI from the
Astron SS series.
With the tee connector split and the TX side going into a
dummy load, there is no desense. If I reconnect the tee and
go to the -8920, the desense is back.
You lost me on that one. You're saying you're testing for desense by
removing the tee from the antenna port of the duplexer, feeding
-Builder] Desense has me pulling my hair out!
(Was DB4060 Duplexer Cables
With the tee connector split and the TX side going into a
dummy load, there is no desense. If I reconnect the tee and
go to the -8920, the desense is back.
You lost me on that one. You're saying you're testing
It's an analog supply built into the repeater.
Mike
WM4B
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of DCFluX
Sent: Wednesday, October 08, 2008 11:55 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Desense has me pulling my hair out
pulling my hair out! (Was
DB4060 Duplexer Cables
Mike,
I can hear the fingerstock scraping against the inner tube... not a BAD
scraping... just what sounds like good metal-to-metal contact.
That is normal. The reason I asked is mine had stopped making that
noise. It was almost completely silent
Mike,
Thanks for this information. I will make a note of this. The DB4060
and 4062 duplexers I've seen had identical loops (all strap)
throughout. Apparently some were different for whatever reason.
Here's another interesting bit... mine all had 004 penciled on them
but they were built like
: [Repeater-Builder] Desense has me pulling my hair out!
(Was DB4060 Duplexer Cables
Mike,
Thanks for this information. I will make a note of this. The DB4060
and 4062 duplexers I've seen had identical loops (all strap)
throughout. Apparently some were different for whatever reason.
Here's
@yahoogroups.com [mailto:Repeater-
[EMAIL PROTECTED] On Behalf Of Paul N1BUG
Sent: Wednesday, October 08, 2008 6:27 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Desense has me pulling my hair out!
(Was DB4060 Duplexer Cables
Mike,
Thanks for this information. I will make
: Repeater-Builder@yahoogroups.com [mailto:Repeater-
[EMAIL PROTECTED] On Behalf Of Paul N1BUG
Sent: Wednesday, October 08, 2008 6:27 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Desense has me pulling my hair out!
(Was DB4060 Duplexer Cables
Mike,
Thanks
I don't know if you have tried this or not, but do you have desense
with the duplexer into a dummy load? Or does it just show up when you
hook up an antenna?
Switch mode power supplies are famous for putting out noise on 600kHz,
such as found in battery chargers in boats and RVs. We recently had
Mike Besemer (WM4B) wrote:
I have a strange feeling that it’s arching around the fingerstock. The
inner tuning tubes showed definite signs of wear, but I THOUGHT the
fingerstock was making good contact. Is there any ‘approved’ conductive
lubricant for that area?
Your problem sounds a lot
me pulling my hair out! (Was
DB4060 Duplexer Cables
I don't know if you have tried this or not, but do you have desense
with the duplexer into a dummy load? Or does it just show up when you
hook up an antenna?
Switch mode power supplies are famous for putting out noise on 600kHz,
such as found
-Builder] Desense has me pulling my hair out! (Was
DB4060 Duplexer Cables
Mike,
I urge you to avoid jumping to any conclusions, before you determine the
cause of the problem. With all due respect, I think it is premature to
condemn any component of your repeater until you have performed a very
, October 07, 2008 6:58 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Desense has me pulling my hair out!
(Was DB4060 Duplexer Cables
Mike Besemer (WM4B) wrote:
I have a strange feeling that it's arching around the fingerstock.
The
inner tuning tubes showed definite
I've never worked with cans or repeaters, but I've witnessed similar issues
caused by oxidation/corrosion. Have you tried using a conductive grease on
the housing joints and the rods?
It appears silver-based grease is suggested for all applications above 50
mhz.
Good luck!
Jacob
Mike,
I can hear the fingerstock scraping against the inner tube... not a BAD
scraping... just what sounds like good metal-to-metal contact.
That is normal. The reason I asked is mine had stopped making that
noise. It was almost completely silent when I rotated the knobs.
That was one of the
While we are on the subject of the DB4060/62, I've got a couple of dead cans
with a bad tuning cap.
Does anyone have a source I can call to buy some of the Johanson 5602 tuning
caps? Some of the Johanson distributors don't stock it and require a big min
order. I've looked at Nebraska Surplus and
, October 07, 2008 5:03 AM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Desense has me pulling my hair out! (Was
DB4060 Duplexer Cables
With the tee connector split and the TX side going into a dummy load, there
is no desense. If I reconnect the tee and go to the -8920
[mailto:[EMAIL PROTECTED] On Behalf Of Mike Besemer (WM4B)
Sent: Tuesday, October 07, 2008 5:03 AM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Desense has me pulling my hair out! (Was
DB4060 Duplexer Cables
With the tee connector split and the TX side going into a dummy
, October 07, 2008 8:54 PM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Desense has me pulling my hair out! (Was
DB4060 Duplexer Cables
Mike,
How are you measuring the desense?
How are you connecting the signal generator to the receiver?
What are you using
Have you look at your transmitter when the desense starts?
David
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Mike Besemer (WM4B)
Sent: Monday, October 06, 2008 7:39 PM
To: Repeater-Builder@yahoogroups.com
Subject:
@yahoogroups.com
Subject: RE: [Repeater-Builder] Desense has me pulling my hair out! (Was
DB4060 Duplexer Cables
Have you look at your transmitter when the desense starts?
David
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Mike
)
Sent: Monday, October 06, 2008 8:56 PM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Desense has me pulling my hair out! (Was
DB4060 Duplexer Cables
David,
Not sure what youre asking, but if youre asking about spurs, shes a clean
as a whistle. VSWR is fine as well
]
To: Repeater-Builder@yahoogroups.com
Sent: Monday, October 06, 2008 9:04 PM
Subject: RE: [Repeater-Builder] Desense has me pulling my hair out! (Was
DB4060 Duplexer Cables
I neglected to mention in the first post, but I also put the crystals into a
2nd repeater we have and had the same problem.
I may
: Monday, October 06, 2008 9:15 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Desense has me pulling my hair out! (Was
DB4060 Duplexer Cables
Sounds like maybe a bad notch cap or a bad harness cable. At first I thought
maybe a transmitter spur, but you've now ruled that out
-
From: Mike Besemer (WM4B) [EMAIL PROTECTED] mailto:mwbesemer%40cox.net
net
To: Repeater-Builder@ mailto:Repeater-Builder%40yahoogroups.com
yahoogroups.com
Sent: Monday, October 06, 2008 9:04 PM
Subject: RE: [Repeater-Builder] Desense has me pulling my hair out! (Was
DB4060 Duplexer Cables
I
:39 PM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Desense has me pulling my hair out! (Was
DB4060 Duplexer Cables
I've got a club meeting Thursday and need to present something to the club.
Assuming worse case that the cans I have are a total loss, what suggestions
have
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