Re: Topband: Two wire Beverage Question

[Herb Schoenbohm]

On 5/22/2012 12:47 PM, Mike Waters wrote:
> I don't think the length is the reason that you're not hearing any signals
> or noise in the reverse direction. How well does it work on 40 in the
> forward direction?
>
>
I works extremely well on 40 meters in the forward direction in fact I 
was using it to work 706T on 40 SSB and it completely nulled out all the 
rouges and KC cops on the mainland that would have otherwise made copy 
impossible.  So I beleive in using a 900 foot reverse  Beverage on 40 
but wish I could get it to work in the reverse direction as well.  For 
the reverse direction I have constructed a 600 foot single wire Beverage 
about 50 feet away and it works fine.

Herb, KV4FZ
___
UR RST IS ... ... ..9 QSB QSB - hw? BK

Re: Topband: Two wire Beverage Question

[g3pqa]

-Original Message- 
From: ZR
Sent: Tuesday, May 22, 2012 4:28 PM
To: g3...@onetel.com ; TopBand List
Subject: Re: Topband: Two wire Beverage Question

>
>
> I recently measured Gary's 2-way boxes and they are good (virtually flat
> freq response) to over 21 MHz..
> Unfortunately my 200m 2-way is down on 3.5MHz in reverse direction, and
> also
> deaf on 7MHz probably because total transmission line losses are over 20dB
> on that band. Plus earth and transformer losses another few dB.
> (I was thinking of trying a remote preamp).
> 73
> John G3PQA
>
> How was that measured John? On the bench can miss a lot and flat to me
outside usually means excessive loss.
Im using WD-1A, WF-16/U, and 2 wire rural telephone cable which is
copperweld.

Listening on 40 a few minutes ago shows no particular loss but very sharp
directivity. The directivity really knocks local crud right into the noise
floor and the band sounds dead but signals are loud with fantastic SNR..

RG-6 up to about 150' feeds the switching box and then 750' of 1/2" CATV
hardline back to the house. A preamp is available but hasnt been needed
since the rebuild started 2 years ago.

>Transformer cores are all BN73-202 with primaries and secondaries isolated
>in individual Teflon tubing for minimal C coupling.
>Carl
>KM1H


Carl,
Thanks. The 75 ohm feeder loss measured with a home-made dBm meter. I should 
have said, I use 75 ohm twin for the beverage, and I measured the loss of a 
spare drum in the shack on a VNA as just under 4dB per 100m. on 7MHz.
Adding, say 3 dB loss, for plugs, transformers and small mismatch, plus 2 dB 
for earth loss, the total loss in reverse direction comes to approximately 
23dB, perhaps not surprising it does not work.
As my system is 75 ohms, I use home made transformers , feed type 43 binoc, 
refl BN73-202.
I will re-measure over the summer to double check all this, your results are 
encouraging.

Unfortunately it would be a huge job over other property (some of it stealth 
work!) to replace, so the preamp route may be the best in my case.

73's
John 

___
UR RST IS ... ... ..9 QSB QSB - hw? BK

Re: Topband: Two wire Beverage Question

[Mike Waters]

I don't think the length is the reason that you're not hearing any signals
or noise in the reverse direction. How well does it work on 40 in the
forward direction?

I don't know all the details of what you have there (and what you've
tried). But the first thing that came to mind is that the reflection
transformer (and/or other transformers) may not be the correct impedance
ratio, and so the antenna has standing waves (it should be flat and
non-resonant.) What is the ratio of the reflection transformer? For 145 ohm
line 10' high, it should be ~3.3:1.

73, Mike
http://www.w0btu.com/Beverage_antennas.html

On Tue, May 22, 2012 at 7:39 AM, Herb Schoenbohm  wrote:

> ... A possible reason why the two WD1-A does not work in the reverse
> direction on 40 meters, but works well on 160 and 80 could be that it is to
> long for 40.
>
___
UR RST IS ... ... ..9 QSB QSB - hw? BK

Re: Topband: Two wire Beverage Question

[Bob Eldridge]

Hi Herb, Niko:
> could be that it is too long for 40.  This is just a
>gut reaction as I have not come up with any  reason.
Of course it is too long.  Beverage said that when it is too long 
there are so many lobes (and therefore nulls) that it is 50-50 that a 
given direction will not be covered; that velocity factor may 
antiphase a given frequency at the transformer; that the extra lobes 
pick up more QRM/QRN;  that "for amateur purposes" (not 
point-to-point) one wavelength or so is optimum; if you don't know the 
exact direction the signal will come from then with more wavelengths 
of wire you are in the lap of the gods and Murphy, so sometimes it 
will serve your purpose and sometimes it will not.
Bob VE7BS

___
UR RST IS ... ... ..9 QSB QSB - hw? BK

Re: Topband: Two wire Beverage Question

[ZR]

>
>
> I recently measured Gary's 2-way boxes and they are good (virtually flat
> freq response) to over 21 MHz..
> Unfortunately my 200m 2-way is down on 3.5MHz in reverse direction, and 
> also
> deaf on 7MHz probably because total transmission line losses are over 20dB
> on that band. Plus earth and transformer losses another few dB.
> (I was thinking of trying a remote preamp).
> 73
> John G3PQA
>


How was that measured John? On the bench can miss a lot and flat to me 
outside usually means excessive loss.
Im using WD-1A, WF-16/U, and 2 wire rural telephone cable which is 
copperweld.

Listening on 40 a few minutes ago shows no particular loss but very sharp 
directivity. The directivity really knocks local crud right into the noise 
floor and the band sounds dead but signals are loud with fantastic SNR..

RG-6 up to about 150' feeds the switching box and then 750' of 1/2" CATV 
hardline back to the house. A preamp is available but hasnt been needed 
since the rebuild started 2 years ago.

Transformer cores are all BN73-202 with primaries and secondaries isolated 
in individual Teflon tubing for minimal C coupling.

Carl
KM1H


___
UR RST IS ... ... ..9 QSB QSB - hw? BK

Re: Topband: Two wire Beverage Question

[g3pqa]

> -Original Message- 
> From: Herb Schoenbohm
Sent: Tuesday, May 22, 2012 1:39 PM
To: Niko Safaric ; TopBand List
Subject: Topband: Two wire Beverage Question

>Thhanks Niko for sharing your experience with me.  I did not find a
reason why this takes place so I ran a separate 600 foot Beverage about
50 feet away and parallel to the two wire. The single wire works fine on
40 meters to the direction of the termination. A possible reason why the
two WD1-A does not work in the reverse direction on 40 meters, but works
well on 160 and 80 could be that it is to long for 40.  This is just a
gut reaction as I have not come up with any  reason.
I hope someone of the topband list group here has an answer.
> Herb Schoenbohm, KV4FZ
> On 5/22/2012 5:02 AM, Niko Safaric wrote:
>
> Dear Herb,
>
> On topband contesting Ihavefound your question about strange manner of
> your beverage


I recently measured Gary's 2-way boxes and they are good (virtually flat 
freq response) to over 21 MHz..
Unfortunately my 200m 2-way is down on 3.5MHz in reverse direction, and also 
deaf on 7MHz probably because total transmission line losses are over 20dB 
on that band. Plus earth and transformer losses another few dB.
(I was thinking of trying a remote preamp).
73
John G3PQA


___
UR RST IS ... ... ..9 QSB QSB - hw? BK

Re: Topband: Two wire Beverage Question

[Guy Olinger K2AV]

On Tue, May 22, 2012 at 9:28 AM, ZR  wrote:

> It could be possible that the commercial transformers are providing a "suck
> out" . Try tuning well on both sides of 40M and see if this is a gradual or
> sudden thing.
>

Beat me to the punch.  Too long together with transformer particulars can
easily produce an unfortunate resonance effect that only appears in one
direction in this configuration.  Devil in the details.  I'm sure that
there are lesser occurrences of this that go unnoticed because the overall
system is adjusted to deal with significant loss in the first place, and it
simply doesn't matter.

73, Guy.
___
UR RST IS ... ... ..9 QSB QSB - hw? BK

Re: Topband: Two wire Beverage Question

[ZR]

My 2 wire Beverages are in the 500-900' range in the air and as BOG's and 
are used regularly on 30 and 40M with no meaningful degradation.

However I wound all my transformers based upon the high RF ground resistance 
here and subtracted that from the theoretical book values for the antenna.

It could be possible that the commercial transformers are providing a "suck 
out" . Try tuning well on both sides of 40M and see if this is a gradual or 
sudden thing.

Carl
KM1H




- Original Message - 
From: "Herb Schoenbohm" 
To: "Niko Safaric" ; "TopBand List" 

Sent: Tuesday, May 22, 2012 8:39 AM
Subject: Topband: Two wire Beverage Question


Thhanks Niko for sharing your experience with me.  I did not find a
reason why this takes place so I ran a separate 600 foot Beverage about
50 feet away and parallel to the two wire. The single wire works fine on
40 meters to the direction of the termination. A possible reason why the
two WD1-A does not work in the reverse direction on 40 meters, but works
well on 160 and 80 could be that it is to long for 40.  This is just a
gut reaction as I have not come up with any  reason.

I hope someone of the topband list group here has an answer.

Herb Schoenbohm, KV4FZ




On 5/22/2012 5:02 AM, Niko Safaric wrote:
>
> Dear Herb,
>
> On topband contesting Ihavefound your question about strange manner of
> your beverage
>
> »I have a 900 foot WD1-A two wire Beverage that runs east and west
> and
>
> works well and has a great FB ratio on 160 and 80 meters. It is
> fed with
>
> a KD9SV box and reflection transformer for WD1-A telephone wire. I
> have
>
> swept the antenna with an analyzer and the antenna is relatively flat
>
> beyond 10 Mhz.  However I notice that when I try to RX  with it on
> 7Mhz
>
> the reception (noise level) drops to the floor and signals are not
> there
>
> in the West direction (Reverse Direction) but OK in the East.  The
> noise
>
> floor drops a good 30 db and the receiver appears dead on 40 to
> the west
>
> but works well to the East.  I have an identical WD1-A two wire
> Beverage
>
> running NNE and SSW which works fine on 40 meters in both
> directions.  I
>
> have absolutely no idea why this should be the case except that the
>
> cable feeding the Beverage box is RG-6U and could have some water
>
> encroachment which increase the losses at 7MHz greatly.  Before I
> do a
>
> new cable run I plan to just swap the two RG-6 cables and see if the
>
> problem reverses now to the East rather than the West.  I post
> this to
>
> ask if anyone has had a similar experience with a well functioning
>
> Beverage that appears completely dead on 7 Mhz and above.«
>
> I have exactly the same problemas you hadexceptmy beverageis not
> completedeadin one directionon40mand higherbands.F/B ratio
> isalsostrange.With switching directions W/EI cangetup
> to30dBF/B,butonly for signals coming from East.On another
> directionF/Bratio issignificantjust for some signals coming from W,
> but not for allof them.
>
> I havealreadyreplacedtransformers, made a good ground with radials on
> both side, replacecoax RG59 with RG213...butnodifference.
>
> I am interested, how did you solve your problem?
>
> Best regards,
> Niko, S53a, 9J3a
>
>
>
>

___
UR RST IS ... ... ..9 QSB QSB - hw? BK


-
No virus found in this message.
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___
UR RST IS ... ... ..9 QSB QSB - hw? BK

Re: Topband: Two wire beverage question

[Guido Tedeschi]

With that trick, you can switch four directions using only one single 
coax cable, two RBS-1P and another relay that is switched with +12Vdc 
and 9Vac.
With 0V and -12V you control one RBS1-P, with 9Vac and +12V you select 
and control the other RBS1-P
73 de Guido, ik2bcp

Il 24/03/2012 13:03, Kenneth Grimm ha scritto:
> Thanks very much Guido!  That is the answer I was looking for.  I had 
> forgotten about the use of AC in switching.  Now that you have told 
> me, it is obvious!   Thanks again OM.
>
> 73,
>
> Ken - K4XL
>
> On Fri, Mar 23, 2012 at 6:46 PM, Guido Tedeschi  > wrote:
>
> Il 23/03/2012 16:10, Kenneth Grimm ha scritto:
> > Both of these boards appear to have an electrolytic capacitor
> > installed.  On both boards the electrolytic appears to be
> associated with
> > the direction switching relay.  None of the two wire beverage
> diagrams that
> > I have seen have such a cap and I wonder what its function is
> and how it is
> > connected in the circuit.  I am told that the value is 100 mfd @
> 50 volts.
> >
> > Apparently the cap isn't necessary, but since I have a few in my
> junk box,
> > this might be an opportunity to put one of them to use!
> >
> If you are talking about the RBS-1P, the electrolytic  capacitor is
> connected in parallel with the relay coil (positive terminal of
> capacitor connected to ground), after the diode with anode
> connected to
> the relay, and it is needed because you can switch the direction also
> with an AC voltage (about 8-9Vac).
> If you will never use an AC voltage but only -12Vdc, the capacitor is
> not needed...
> 73 de Guido, ik2bcp
>
> ___
> UR RST IS ... ... ..9 QSB QSB - hw? BK
>
>
>
>
> -- 
> Ken - K4XL
> BoatAnchor Manual Archive
> BAMA - http://bama.edebris.com
>

___
UR RST IS ... ... ..9 QSB QSB - hw? BK

Re: Topband: Two wire beverage question

[Mike Waters]

I believe that capacitor might be to help prevent a loud click in the
receiver when the direction is switched. When the voltage is suddenly
removed from a relay coil, there can be quite a pulse from back EMF as the
magnetic field on the coil collapses. Maybe it is to control the rate of
collapse, thus preventing a big RF spike.

On Fri, Mar 23, 2012 at 11:40 AM, Herb Schoenbohm wrote:

> I would avoid any attempts to do relay switching by supplying voltage down
> a coax cable but rather use two coax runs.


I do it both ways here. And both have proven very reliable, after taking
certain preventative measures (both electrical and mechanical).



>  Another disadvantage of having a blocking cap in the signal line is that
> you can not determine the coax run continuity through the windings of
> toroid back to the shack with a common VOM.
>

The way I check coax continuity --and whether the relay is operating--  is
with a super bright LED than can be seen from the house at night, several
hundred feet away. It's connected to a contact on the relay.
 It could also be done by applying the normal switching voltage to the coax
in series with a milliammeter (just use your VOM) and measuring the current
at the shack; if there's no (or very low or very high) current, then you
have a problem.

I gar-run-tee you that no ants will get inside the remote control boxes
here. And with those completely sealed enclosures, no water has entered,
and nothing inside has deteriorated after several years outdoors, either.

I think DXE would have done their customers a favor by putting that little
DIP relay in a good socket and using GDTs, etc. to give the relay and
transformers a better chance of surviving at least some surges induced in
the antenna by nearby lightning strikes. But that's just my opinion; maybe
the spark gaps that I've heard they have built into the circuit board work
better than I think.

If anyone wants to build their own reliable remote Beverage switch, take a
look at the schematics, photos, etc. of the two different types at
http://www.w0btu.com/Beverage_antennas.html.

73, Mike
www.w0btu.com
___
UR RST IS ... ... ..9 QSB QSB - hw? BK

Re: Topband: Two wire beverage question

[Guido Tedeschi]

Il 23/03/2012 16:10, Kenneth Grimm ha scritto:
> Both of these boards appear to have an electrolytic capacitor
> installed.  On both boards the electrolytic appears to be associated with
> the direction switching relay.  None of the two wire beverage diagrams that
> I have seen have such a cap and I wonder what its function is and how it is
> connected in the circuit.  I am told that the value is 100 mfd @ 50 volts.
>
> Apparently the cap isn't necessary, but since I have a few in my junk box,
> this might be an opportunity to put one of them to use!
>
If you are talking about the RBS-1P, the electrolytic  capacitor is 
connected in parallel with the relay coil (positive terminal of 
capacitor connected to ground), after the diode with anode connected to 
the relay, and it is needed because you can switch the direction also 
with an AC voltage (about 8-9Vac).
If you will never use an AC voltage but only -12Vdc, the capacitor is 
not needed...
73 de Guido, ik2bcp

___
UR RST IS ... ... ..9 QSB QSB - hw? BK

Re: Topband: Two wire beverage question

[ZR]

While I would never buy anything from DXE that I can do a whole lot cheaper 
Ive been running voltage down runs of CATV hardline up to 750' for Beverage 
switching for up to 22 years with no such problems.

Send those useless DXE boxes to me, I'll even pay postage..

Carl
KM1H


- Original Message - 
From: "Herb Schoenbohm" 
To: 
Sent: Friday, March 23, 2012 12:40 PM
Subject: Re: Topband: Two wire beverage question


> Ken,
>
> I would avoid any attempts to do relay switching by supplying voltage
> down a coax cable but rather use two coax runs.  The relay, blocking
> cap, diode and associated circuit in my case with two DXE boxes have
> deteriorate within less than a year to be useless, mostly due to
> electrolysis and zillions of ants attracted apparantly by the voltage or
> relay coil vibration when pulled in. (Yes I covered all the edges with
> silicon sealant)   DXE refuses to send me a print to repair the board
> for what reason I don't know, thus  making repair very difficult.   They
> worked well when I got them but are useless today.Another
> disadvantage of having a blocking cap in the signal line is that you can
> not determine the coax run continuity through the windings of toroid
> back to the shack with a common VOM. This is an easy troubleshooting
> tool that is not possible via the DXE system.
>
> Herb, KV4FZ
>
>
>
>
>
> On 3/23/2012 11:10 AM, Kenneth Grimm wrote:
>> I'm in the process of building a new two wire beverage control box to
>> replace the one that Thor destroyed the other day.  Fortunately the coax
>> lead in was disconnected at the time!  The top of the box has not been
>> recovered and much of the contents vaporized.  The inside of the box has
>> lots of scorch marks...and not much else.  The reflection transformer, 
>> some
>> 580 feet away, appears to be unaffected as does the 450 ohm twin lead.
>>
>> I plan to do a PC board for the new control box and so I had a look at 
>> how
>> the DX Engineering box was laid out.  I also had a look at the board made
>> by RA6LBS.  Both of these boards appear to have an electrolytic capacitor
>> installed.  On both boards the electrolytic appears to be associated with
>> the direction switching relay.  None of the two wire beverage diagrams 
>> that
>> I have seen have such a cap and I wonder what its function is and how it 
>> is
>> connected in the circuit.  I am told that the value is 100 mfd @ 50 
>> volts.
>>
>> Apparently the cap isn't necessary, but since I have a few in my junk 
>> box,
>> this might be an opportunity to put one of them to use!
>>
>> 73,
>>
>
> ___
> UR RST IS ... ... ..9 QSB QSB - hw? BK
>
>
> -
> No virus found in this message.
> Checked by AVG - www.avg.com
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> 

___
UR RST IS ... ... ..9 QSB QSB - hw? BK

Re: Topband: Two wire beverage question

[Andrey Fedorishchev]

Feel free to check http://www.ra6lbs.ru/Papers/Bv_RA6LBS.ppt p. 10 and 13
to see the diagram, which is by the way a bit different of the  DXE box.
And there is no electrolitics of cource, the only similar part on my PCB is
inductance in reality.

2012/3/23 Kenneth Grimm 

> I'm in the process of building a new two wire beverage control box to
> replace the one that Thor destroyed the other day.  Fortunately the coax
> lead in was disconnected at the time!  The top of the box has not been
> recovered and much of the contents vaporized.  The inside of the box has
> lots of scorch marks...and not much else.  The reflection transformer, some
> 580 feet away, appears to be unaffected as does the 450 ohm twin lead.
>
> I plan to do a PC board for the new control box and so I had a look at how
> the DX Engineering box was laid out.  I also had a look at the board made
> by RA6LBS.  Both of these boards appear to have an electrolytic capacitor
> installed.  On both boards the electrolytic appears to be associated with
> the direction switching relay.  None of the two wire beverage diagrams that
> I have seen have such a cap and I wonder what its function is and how it is
> connected in the circuit.  I am told that the value is 100 mfd @ 50 volts.
>
> Apparently the cap isn't necessary, but since I have a few in my junk box,
> this might be an opportunity to put one of them to use!
>
> 73,
>
> --
> Ken - K4XL
> BoatAnchor Manual Archive
> BAMA - http://bama.edebris.com
> ___
> UR RST IS ... ... ..9 QSB QSB - hw? BK
>



-- 
Andrey Fedorishchev,
RA6LBS


www.RA6LBS.ru
___
UR RST IS ... ... ..9 QSB QSB - hw? BK

Re: Topband: Two wire beverage question

[Bill Wichers]

Did the DXE board have a conformal coating applied? If it did not (which
is poor design considering it is intended to operate outdoors), you can
get small cans of the stuff made by Techni-Spray. I've use the silicone
conformal coating on some boards I've made for outdoor use and it holds
up well IF you prep the board properly first (they make a cleaner for
this purpose). I found if you cheap out and skip the cleaning part the
coating doesn't adhere well and tends water can get under the coating
and damage the board.

Neither the conformal coating nor the "Blue Shower" cleaner that the
recommend are cheap, but they do work well. If you use the coating make
sure to mask off things like contact strips and contact surfaces. I
found that most common tape doesn't stay stuck when you apply the
conformal coating so you have to use the fancier tapes made for use in
the PC board manufacturing process (the kapton tapes seem to work OK).

  -Bill


> I would avoid any attempts to do relay switching by supplying voltage
down
> a
> coax cable but rather use two coax runs.  The relay, blocking cap,
diode
> and
> associated circuit in my case with two DXE boxes have deteriorate
within
> less than a year to be useless, mostly due to electrolysis and
zillions of
> ants attracted apparantly by the voltage or relay coil vibration when
> pulled
> in. (Yes I covered all the edges with
> silicon sealant)   DXE refuses to send me a print to repair the board
[snip]
> Herb, KV4FZ
___
UR RST IS ... ... ..9 QSB QSB - hw? BK

Re: Topband: Two wire beverage question

[Lennart M]

 
Like Herb is pointing out, one of the problems with stuff bought off the
shelf (from DXE or others) is the lack of documentation.
I have been waiting more than 3 years - so far without luck - for a real
documentaione of the DXE NCC-1 which is a very good phasing unit but int the
end one sertainly needs a good schematic if somthing goes wrong. So far they
have failed to deliver.
Len
SM7BIC

I would avoid any attempts to do relay switching by supplying voltage down a
coax cable but rather use two coax runs.  The relay, blocking cap, diode and
associated circuit in my case with two DXE boxes have deteriorate within
less than a year to be useless, mostly due to electrolysis and zillions of
ants attracted apparantly by the voltage or relay coil vibration when pulled
in. (Yes I covered all the edges with 
silicon sealant)   DXE refuses to send me a print to repair the board 
for what reason I don't know, thus  making repair very difficult.   They 
worked well when I got them but are useless today.Another 
disadvantage of having a blocking cap in the signal line is that you can not
determine the coax run continuity through the windings of toroid back to the
shack with a common VOM. This is an easy troubleshooting tool that is not
possible via the DXE system.

Herb, KV4FZ





___
UR RST IS ... ... ..9 QSB QSB - hw? BK

___
UR RST IS ... ... ..9 QSB QSB - hw? BK

Re: Topband: Two wire beverage question

[Herb Schoenbohm]

Ken,

I would avoid any attempts to do relay switching by supplying voltage 
down a coax cable but rather use two coax runs.  The relay, blocking 
cap, diode and associated circuit in my case with two DXE boxes have 
deteriorate within less than a year to be useless, mostly due to 
electrolysis and zillions of ants attracted apparantly by the voltage or 
relay coil vibration when pulled in. (Yes I covered all the edges with 
silicon sealant)   DXE refuses to send me a print to repair the board 
for what reason I don't know, thus  making repair very difficult.   They 
worked well when I got them but are useless today.Another 
disadvantage of having a blocking cap in the signal line is that you can 
not determine the coax run continuity through the windings of toroid 
back to the shack with a common VOM. This is an easy troubleshooting  
tool that is not possible via the DXE system.

Herb, KV4FZ





On 3/23/2012 11:10 AM, Kenneth Grimm wrote:
> I'm in the process of building a new two wire beverage control box to
> replace the one that Thor destroyed the other day.  Fortunately the coax
> lead in was disconnected at the time!  The top of the box has not been
> recovered and much of the contents vaporized.  The inside of the box has
> lots of scorch marks...and not much else.  The reflection transformer, some
> 580 feet away, appears to be unaffected as does the 450 ohm twin lead.
>
> I plan to do a PC board for the new control box and so I had a look at how
> the DX Engineering box was laid out.  I also had a look at the board made
> by RA6LBS.  Both of these boards appear to have an electrolytic capacitor
> installed.  On both boards the electrolytic appears to be associated with
> the direction switching relay.  None of the two wire beverage diagrams that
> I have seen have such a cap and I wonder what its function is and how it is
> connected in the circuit.  I am told that the value is 100 mfd @ 50 volts.
>
> Apparently the cap isn't necessary, but since I have a few in my junk box,
> this might be an opportunity to put one of them to use!
>
> 73,
>

___
UR RST IS ... ... ..9 QSB QSB - hw? BK

Re: Topband: Two wire Beverage Question

[Mike Waters]

Hello Herb,

To me, this sounds like a termination problem. If the termination is missing
(or defective), there will be standing waves on the Beverage and at certain
frequencies it will act like a short at the end.

I know you said you swept the antenna on other frequencies, but I can't
think of anything else right now that it might be.

73, Mike
http://www.w0btu.com/Beverage_antennas.html

On Mon, Oct 17, 2011 at 6:11 PM, Herb Schoenbohm  wrote:

> ...t when I try to RX  with it on 7Mhz the reception (noise level) drops to
> the floor and signals are not there in the West direction (Reverse
> Direction) but OK in the East. ...
>
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UR RST IS ... ... ..9 QSB QSB - hw? BK