Maybe my "Zoom" model is different from yours but I opened up my AA-55 Zoom and
found the connector to be rather securely mounted. So much so that I
reconsidered my idea of replacing the SO239 with a type N. Not that it isn't
doable, just that it was more trouble than I wanted to bother with
Terry,
I wasn't going to say anything, but now that I hear this I have to tell you
all that my (wonderful!) AA-230Pro came this way to me from the factory a
few yrs ago. I spent big Canadian bux on it and was pretty disappointed
when most things didn't work on it. I cracked the case and
Rick is correct. There is room in my AA-55 Zoom for a blocking cap. However, I
only connect it to DC grounded antennas. My 160-meter inverted-L has a 20Kohm,
10W wirewound resistor connecting the vertical to ground on the antenna side of
the coax connector as a static bleed. Without it, I
On 6/11/2018 9:50 AM, Jim Thomson wrote:
## Is there room inside those rig experts units to install a .01 uf disc
ceramic cap ??
A 50-100 volt cap would be smaller diameter than a 1 kv cap. There is
your DC
On my 160 meter vertical I have been able to pull 1/2 inch long
arcs
Thomson wrote:
Date: Mon, 11 Jun 2018 07:29:39 -0700
From: "Richard (Rick) Karlquist"
To: terry burge , topband@contesting.com
Subject: Re: Topband: cutting coax stubs for 80 meter 4-square
On 6/10/2018 8:01 PM, terry burge wrote:
All's well that ends well I'm happy to report.
could be a problem.
Terry
KI7M
> On June 11, 2018 at 9:50 AM Jim Thomson wrote:
>
>
> Date: Mon, 11 Jun 2018 07:29:39 -0700
> From: "Richard (Rick) Karlquist"
> To: terry burge , topband@contesting.com
> Subject: Re: Topband: cutting coax stubs for 80 meter 4-s
On 6/10/2018 8:01 PM, terry burge wrote:
All's well that ends well I'm happy to report. K2AV, Guy suggested I check the
SO-239 on the Rig Experts AA-170 and I found an open solder joint between the
back of the connector and the circuit board. Even with my close in glasses and
a magnifying
Richard,
You are so right about that static issue. I even seem to remember the Rig
Experts manual says to short the antenna leads together to remove any static
build up before connecting the analyzer. I think that was why I wasn't too
impressed with my MFJ-259b. Probably my own fail when I
All's well that ends well I'm happy to report. K2AV, Guy suggested I check the
SO-239 on the Rig Experts AA-170 and I found an open solder joint between the
back of the connector and the circuit board. Even with my close in glasses and
a magnifying glass it was hard to be certain. So a little
On 6/10/2018 10:27 AM, Jim Thomson wrote:
## Seems to me MFJ supplied a HP filter when using the MFJ-259B, to kill
anything < 1.8 mhz.
Jim VE7RF
IIRC, what MFJ supplied was a tunable NOTCH filter, which might work OK
in situations where there is only one station that is strong
enough
AM Jim Thomson wrote:
>
>
> Date: Sun, 10 Jun 2018 22:28:11 +0800
> From: Jeff Blaine
> To: topband@contesting.com
> Subject: Re: Topband: cutting coax stubs for 80 meter 4-square
>
> it's going to be problems.? In fact I discovered the hard way that even
> up
Hi Jeff,
Same story here and that is one reason why I am so disappointed my Rig Experts
AA-170 failed me. It's really a nice instrument to use in so many ways. Now I
thought the explanation of doing stubs was not nearly as good as using the
MFJ-259b. The MFJ had just been sitting out in my
The MFJ259 is a fine box but when you get to 80m with anything near a BC
it's going to be problems. In fact I discovered the hard way that even
up on 20m the box can read funky if your antenna is big enough or high
enough. I have a Rig Expert now as well and really love that thing -
plus
Hi All,
I was discussing this thread with a microwave engineer on 75 meters this
morning and he reminded me that I had AM RF in my RX antennas at my
previous QTH. So much that I used Hi-Pass filters on my beverages and
pennants.
Terry, Do you have an AM radio station near by that could be
Hi guys and gals,
Well, to make a long story short my Rig Experts AA-170 has quite working. Looks
normal but a 56 ohm resistor at the end of the 75 ohm coax reads infinite. On
the MFJ-259b it reads 56 ohms. Check SWR and the MFJ reads 7.499.2 Mhz 1.1:1
SWR R=56/57 ohms X=0. Coax is 55' 4 3/8"
I used a return loss bridge and measured a TEE fitting with a good 50
ohm load on one port the length of cable on the other side. The antenna
analyzer will read a perfect 50 ohm match when the cable is 1/2
wavelength long. If the cable is an open quarter wave, your analyzer
will show high VSWR
Good point Wes. I will see if I can find a decent value of resistor. My Rig
Experts AA-170 was purchased because I did not trust the readings my MFJ-259b
was giving me while working on my hytower. Pretty penny for these antenna
analyzers. But I will bet if it won't do the stub frequency checks
Since he said the coax was 75-ohm, a 75-ohm termination would be better.
On 6/9/2018 5:07 PM, Richard (Rick) Karlquist wrote:
As a sanity check, terminate the coax with a 50 ohm resistor and verify
that you have good coax. Flat line at 1:1 SWR, etc.
Rick N6RK
On 6/9/2018 4:57 PM, terry
As a sanity check, terminate the coax with a 50 ohm resistor and verify
that you have good coax. Flat line at 1:1 SWR, etc.
Rick N6RK
On 6/9/2018 4:57 PM, terry burge wrote:
I don't know what is wrong here but I keep getting in this situation where my
typing starts running back over my
I don't know what is wrong here but I keep getting in this situation where my
typing starts running back over my writing. I will try again to reply.
Joel,
I have tried all that the manual says without success. All I see is the
horizontal solid and dashed lines of R and X. No indication of a
Hi Terry,
I replaced the 1/4 lines on my 80 meter 4 square this past fall and used
my AA-170 to set the length with no problem.
Just select "all" for the mode and set the freq you're aiming for and then
trim the line until X equals zero with the far end open. Should work fine.
I always calculate
Ok Terry, well 1/2 wave at 7234kc will = 1/4 wave at 3617kc, so trim
until u get near 7500kc
and cut all lines that length and u should be ok. Back in the 1980s when
I built my 4 square, I used a noise bridge
to build my lines.
Ed
KG4W
On 6/9/2018 5:19 PM, terry burge wrote:
Hi Ed,
Hi Ed,
Unfortunately I don't get any indication per the Rig Experts manual with an
open. The R/X just does not get any indication from 1982Khz all the way to
10,500+ KHz. On my MFJ-259B (old one) with a short I get at 7.234 Mhz (or
about) R=1 and X=0. Suspect the R indicates the short of
Hi Terry, see page 16 of this site
https://www.rigexpert.com/files/manuals/aa170/aa-170-manual.pdf
when looking for a 1/4 wave, leave the far end of the coax under test open.
when looking for a 1/2 wave, short the far end of the coax under test.
Your 57'7" pc of would be 1/4 wave at 3750 if
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