Re: Topband: K9ay loop not performing

[Raoul Coetzee via Topband]

 Yes Rob, my TX vertical feedpoint was closer to 7 ohm before it being 
transformed to 50 ohm by means of a auto transformer style bottom coil and tap.
I have used a big fat relay with massive silver contacts, (it was used in a UPS 
to switch battery banks)  but with the actuator coil wires fed trough a choke. 
So the whole relay was at RF potential, that way you do not need to worry about 
coil/contact isolation spacing.
Raoul ZS1C

On Wednesday, December 11, 2019, 2:38:50 PM GMT+2, Rob Atkinson 
 wrote:  
 
 Actually, if you have a quarter wave driven element and you are
disconnecting it at the feedpoint, your relay concern shouldn't be
voltage so much as current.  Fast switching and large contact surface
is more important than voltage handling.

73
Rob
K5UJ
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Re: Topband: K9ay loop not performing

[Raoul Coetzee via Topband]

 I use a a relay to disconnect to the vertical portion just above the bottom 
matching coil, keeping all else connected.
 I do not understand why  the shield should be disconnected ? 
If it carries RF back it could be decoupled by ground rods to shield or 
chokes.Bu if he top section is open circuit, there would not be any signal to 
carry back in the first place.
Raoul ZS1C

On Sunday, December 8, 2019, 2:30:00 PM GMT+2, Rob Atkinson 
 wrote:  
 
 If you open the tx antenna feedline for rx, from my experience, you
need to completely open the entire feedline, namely the coaxial cable
shield as well as the center conductor.  coaxial relays that maintain
conductivity of the shield when N.O. won't detune/isolate the tx
antenna.  I use a pair of open frame relays for this.  Fortunately on
1800 kc the Z bump is almost nonexistent.  What will govern your
choice of relay is tx power and tx time, and whether or not you
require QSK.  I do not, but if you do, you may have to consider
something like multiple paralleled reed relays tor speed and power, or
vacuum relays.


73
Rob
K5UJ
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Re: Topband: [cwops] Topband season looking good

[Raoul Coetzee via Topband]

 I meant to say first NA for this year!
On ‎Friday‎, ‎October‎ ‎5‎, ‎2018‎ ‎08‎:‎46‎:‎06‎ ‎AM‎ ‎SAST, Raoul Coetzee 
via Groups.Io  wrote:  
 
 Managed my first NA this morning around my SR on 160m.I worked Bob, W9EWZ in 
Wisconsin (CW of course)
Raoul ZS1C_._,_._,_Groups.io Links:
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Topband: Topband season looking good

[Raoul Coetzee via Topband]

Managed my first NA this morning around my SR on 160m.I worked Bob, W9EWZ in 
Wisconsin (CW of course)
Raoul ZS1C
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Re: Topband: PY1RO

[Raoul Coetzee via Topband]

 Sad to hear about PY1RO,he was my first PY on 160m many years ago.RIP
ZS1C
On Sunday, May 6, 2018, 8:27:17 PM GMT+2, Roger Parsons via Topband 
 wrote:  
 
 From the Daily DX today:

"PY1RO, Rolf Rasp, passed away yesterday after suffering from a heart 
attack. He had heart problems for several years. PY1RO was very active 
on Topband and the Magic Band (160 and 6 Meters). Rolf put on 
DXpeditions to PY0DVG, ZX0VG, PY1RO/0, PY0FN, PY1RO/5N2, PY0RO, ZX0FOC 
and PY0TM as well being a DXpedition team member at PW0T and PW2M. He 
was a member of FOC (# 1237). Our condolences to his wife Sonia and 
the rest of the Rasp family."

I was saddened to read of Rolf's death. He was an important part of 160m 
history for many years.

Roger
VE3ZI

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Re: Topband: what does it take to get on new band 600 meters

[Raoul Coetzee via Topband]

 I have been playing with a few ideas, one was to mix a 6 Mhz Xtal oscilator 
output with a 6.474 MHz signal from my ft817 (into a small 50 ohm load)the 
difference, 474 KHz was amplified with tubes (valves for the UK ) and I ended 
up driving an old 813.Why? because I wanted a job for the tubes that was in the 
garage.It worked fine, I also used the Ft1000 MP, one vfo set to rx on 474 KhZ  
and the other to TX on 6.474 MHz using the same valve mixer/amplifier/ 
driver/PA setup.That project took up space, I had no one to talk to, and ended 
in  the garage with other projects !
The current project is using two  TTL decade counter chips (74LS192)  to divide 
a 13.77 MHz signal by 100 , ending with 137.7 KHz, this is amplified by two 
transistors, and those drive a FET PA.So far getting 47 watts output , nice 
sine wave after the output filter.Efficiency is a bit poor, I am looking to go 
class E.
If I use one decade counter, (tap the ouput signal from the first counter) )  
and only divide by 10, I could put a 4.74 MHz signal in to it, and get 474 KHz 
out.Again using the dual VFO's to tx on on 4.74MHz  and RX on 474Kc.
Of course, I could use a cheap DDS module and an Ardiuno to generate the signal 
too, but now  I use the rig's switching and keying, no RX/TX antenna relays etc.
I will  bottom load the 160m vertical with 5400uH coil and a suitable tap to 
match.
Maybe this may stimulate some further thoughts and ideas.
Raoul ZS1C


On Thursday, November 2, 2017, 8:40:34 PM GMT+2, Jeff Kincaid 
 wrote:  
 
 I've been trying to get Heathkit to produce a dual bander of some sort for the 
two new bands.  Why not start by dropping them a line supporting the idea?
Regards,Jeff W6JK 

    On Thursday, November 2, 2017 10:35 AM, Kevin Adam  wrote:
 

 What does it take to get on 600 meters radio antenna transceiver  power 
requirements


N9IWW
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Re: Topband: FT8: Making it too easy?

[Raoul Coetzee via Topband]

 I would like to know if FT8 also uses the same "Deep Search" as JT65.If it 
does, read this and decide if it is for you.

JT65, is it doing what we want it to do?


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JT65, is it doing what we want it to do?


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Raoul ZS1C
On Thursday, October 26, 2017, 8:36:27 PM GMT+2, DXer 
 wrote:  
 
 Hi Mark,

So, if I use the same 'rational' some people here seems to use, those DXCC
awards earned with full legal power, multiple towers, beams, and amps,
should really be a mark of shame on their holders?  :^)

There is no one way, your way, yes, but not only one way.

73 de Vince, VA3VF



On Thu, Oct 26, 2017 at 2:12 PM, Mark K3MSB  wrote:

> Hi Vince
>
> Well, you could use a machine gun instead of a bow and arrow to bag the
> “big one” and hang it’s head on the wall,  but it wouldn’t be quite the
> same, now would it?
>
> What’s the difference in rolling up to the ice-cream hop in your 1962
> Coupe DeVille convertible that you just cut a check for,  or rolling up in
> one that you’ve spent years restoring?
>
> I think that pretty much answers your question.
>
> 73 Mark K3MSB
>
>
>
> On Oct 26, 2017 1:45 PM, "DXer"  wrote:
>
>> For those that say FT8 makes it too easy to win awards, climb the DXCC
>> ladder, or make it into the HR.
>>
>> May I ask what the reason is for going to the trouble, and expense, of
>> purchasing the best transceivers, installing towers, beams, and amps?
>>
>> How is your operating enhanced, if not by making it easier to 'bag' that
>> difficult entity?
>>
>> Wouldn't a DXCC award be more valuable if earned with a galena receiver,
>> and an indoor random wire?
>>
>> 73 de Vince, VA3VF
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>
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Re: Topband: TZ4AM

[Raoul Coetzee via Topband]

 I agree! And not everybody have space for good RX antennas.And even if we can 
install a good RX antenna in limited space, cheap Chinese products are making 
it worse, it  is a struggle to hear anything.
The other problem is, I use at least 600 watts on 160m, and some EUs try to 
work you with a 100 watts and a dipole,and then call you deaf if you cannot 
hear them. Some do not understand 160m at all.
Regards,Raoul ZS1C


On Saturday, October 14, 2017, 3:07:12 AM GMT+2, K1FZ-Bruce 
 wrote:  
 
 
Africa is a high noise location.  Jeff is working on his antennas,
Meanwhile  giving as many  contacts as he can copy.
As his receive antennas improve,  hope you  find yourself in his log.
73
Bruce-k1fz
 



On Sat, 14 Oct 2017 03:23:54 +0300, Saulius Zalnerauskas  wrote:

But no copy as always.
RX problems

LY5W

On Thu, Oct 12, 2017 at 8:33 PM, K1FZ-Bruce  wrote:

> Jeff, TZ4AM hopes to be on  160 meters tonight around 0300 UTC.        He
> likes    ~  1826.5, 1827.5 and usually  operates split.
>
> Band Conditions are not good but hope for an improvement.
>
>
> 73
> Bruce-k1fz
> .
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Re: Topband: LDEs, witches and magicians

[Raoul Coetzee via Topband]

Dear Dr Ostwald,
 Even though I have not experienced any echoes on HF,I think I will keep an 
open mind.We cannot even explain a weak force like gravity completely, after 
many years of ongoing research.Who are we to say that  LDS  belong in  fairy 
tale?  :-)After all, we are receiving echoes of the big bang in the microwave 
background, so what is a few hours between friends on 160m ? :-)
Regards,Raoul ZS1C





  From: Dr. Wolf Ostwald 
 To: topband@contesting.com 
 Sent: Wednesday, February 8, 2017 8:15 AM
 Subject: Topband: LDEs, witches and magicians
   
hello reflectees,
i never ever experienced echoes on 160. And i do a lot of transmitting 
and have relatively sensitive rx systems.
Given the laws of field expansion and attenuation i consider it a hoax.
I have had round the globe echoes on 20m. But was using 6 el monobander 
with power and at the rite time, when we had greyline. Sometimes 2 to 
three rounds. That was physically explainable.
Anything else is from the land of Alice.


73 de wolf  df2py
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Re: Topband: Front End Filters

[Raoul Coetzee via Topband]

surely it is important to have the correct loading on the crystal,  just 
connecting a crystal in the antenna path is not so good?It seems good loading 
is around 1-3k.
Merry Christmas to all.Raoul ZS1C 



  From: K1FZ-Bruce 
 To: topband@contesting.com; Dave  
 Sent: Saturday, December 24, 2016 7:48 AM
 Subject: Topband: Front End Filters
   
 
The one they are  developing for marketing 'can' have 1 KHZ segment 
crystals channels.. 
 
I would encourage anyone to insert a single crystal in their receiver 
antenna input to see the
difference before considering a purchase.  (Careful not to transmit 
into the experiement)
40 meters is a good test  band as usually has many signals after dark.. 
 
73
Bruce-k1fz
 
 

On Fri, 23 Dec 2016 17:56:07 -0700, Dave  wrote:

      About 15 years ago I built a switchable front end crystal filter, I was
going to market it but it was too expensive for the Ham market. It covers
1800 to 1850 in 5kHz segments with a slight overlap so that there are no
gaps, each section is a half lattice, the insertion loss is about 6dB but
that isn't a problem because I always have about -15dB of attenuation in the
receive path input. Nose bandwidth is 5kHz and about 8kHz at -20dB. Lack of
noise blanker performance is not a problem because big signals make the
blanker useless anyway. I used it during contests when my rig was an IC781,
since changing to a more modern rig, an IC7851, the filter provides no
significant improvement. For working DX on a crowded band it is useful if
your rig does not have a good roofing filter. 

HNY /MX

Dave AA0RS

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Re: Topband: 160 Meter Radio Propagation Prediction Table

[Raoul Coetzee via Topband]

Africa is not part of their world? I thought so, as my radio also seems to say 
I live  in a Black 160m hole.:-) bTW Where is Mos? 
kind regards,Raoul ZS1C

  From: James Rodenkirch 
 To: Top Band Contesting  
 Sent: Tuesday, July 12, 2016 3:22 PM
 Subject: Topband: 160 Meter Radio Propagation Prediction Table
   

..I know, I KNOW . top band propagation predictors are about 
useless  BUT, Hey..anything is worth a looksee.doncha know?!?!

You see this in the write up below the "dashboard" (url at the bottom of this 
post) "A GREEN box means that propagation on the specific path might be 
possible..."

We all know anything is possible..it's when some numerical probability is 
assigned we know some true "measuring" was performed AND we know measuring and 
predicting propagation on top band can approach whimsical BUTconsider this 
a "tool," of sortsI see where the page is updated every five minutes.

71.5/72 de Jim Rodenkirch K9JWV 

P.S. Enjoy the days ahead!!


http://www.spacew.com/www/160pred.html
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Re: Topband: VK0EK confirmation

[Raoul Coetzee via Topband]

Ouch...I made a contribution while they were in Cape Town and we had a good 
evening with the crew and the team in the Cape  Royal Yacht club and after I 
worked them, I contributed another $10.00Now before you blast me as a cheap 
skate Jim, with our our exchange rate you may multiply that with about 14 to 
feel the same effect on your pocket. (14x20)And I had Heard confirmed but NOT 
on 80 and 160 m.Now add the ARRL fees times 14, even with Lotw, and then  DXing 
do become expensive for people with poor economies.
My contacts were on Lotw within hours after my contribution.GL Andy
Kind regards,Raoul


  From: Jim Brown 
 To: topband@contesting.com 
 Sent: Monday, April 18, 2016 6:05 PM
 Subject: Re: Topband: VK0EK confirmation
   
On Mon,4/18/2016 2:56 AM, Andrzej_SP6AEG wrote:
> Courtesy of my friend  Wlodzimierz Herej SP6EQZ paid a donation of $ 10  for
> VK0EK.

Sounds like you're one of the last of the big spenders!

> To this day I have not found confirmation of my QSO on LoTW?.
> I sent the payment on April 12, 2016
> Is the donation has been sent too late and the previous procedure does not
> work, can I do something wrong?.

Did you not read the VK0EK website?  Early LOTW confirmations would be 
sent to those who contributed BEFORE the expedition began. Like you, I 
waited until I had worked them on the boat on their way to Heard to send 
them $300. That's much more than I usually contribute to DX trips, but 
this was a VERY expensive one. I sent a check, and got a nice thank you 
note from KK6EK's XYL. She said I'll get my LOTW when Bob returns home.

> I guess I will have to again make fee to confirm my QSO using the form:
> https://shop.vk0ek.org

It would be good for you to again make a contribution, increasing the 
size of your support. This was a VERY costly expedition.

> Thank you very much for having responded to my call, and especially to 160 m
> what  gave me 263 entities to 160 DXCC.

The way to say thank you is to send more money. :)

European hams got 52.5% of VK0EK QSOs, NA got 19.4%.  EU got 2,372 
Topband Q's, NA got 293 (I got one of them).  Many NA hams who DO 
contribute to these trips are getting more than a bit tired of hearing 
EU stations complaining about DXpeditions not working them but not 
sending money to support the costs.  Most NA hams are retired, so when 
we send money it is from our savings or our pensions.  Here's a partial 
list of the guys who paid for your QSO.

https://vk0ek.org/sponsors-3/

73, Jim K9YC
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Re: Topband: Receive loop observations

[Raoul Coetzee via Topband]

Rick wrote:>With a>circumference of 20 to 40 feet on 160 meters, the null is 
only
>10 or 15 dB deep.
I use a medium wave  BC station about 10miles away from as a reference to check 
my 160m loop, (the loop is reasably broadband but no good on 80m) they are 
about 4 Degrees East off me and with a nice signal of about 40 db and I  easily 
get a a null signal of S 9.I have played around a lot with my  FT1000 MP MKV's 
S-meter using a step ,attenuator, and the meter is most accuratein the range 
above S9 so I am  reasonably happy with my finding of a null of about 40db.Come 
to think of it, I have an old HP Spectrum analyser that I could use to get a 
decent measurement.
Regards,Raoul Zs1C
 

  From: Richard (Rick) Karlquist 
 To: donov...@starpower.net; Top Band Contesting  
 Sent: Friday, April 1, 2016 11:08 PM
 Subject: Re: Topband: Receive loop observations
   


On 4/1/2016 1:25 PM, donov...@starpower.net wrote:
> Hi Jim,
>
>
> A properly constructed loop antenna absolutely requires a preamp.

Yes, but usually the preamp function built into the radio is
sufficient.

> If your loop is operating correctly it will be omni-directional for
> skywave signals and it will have an extremely deep null for an
> unwanted signal propagated to your antenna from one local
> vertically polarized interference source. A well constructed loop
> should have a null depth of 60-80 dB and a null beamwidth of just
> a few degrees. A very rigid mechanical mount is required to
> keep the deep null pointed directly at your interference source.

It is easy to model a loop on NEC, and the results I have seen
do not predict anything like 60 to 80 dB nulling.  With a
circumference of 20 to 40 feet on 160 meters, the null is only
10 or 15 dB deep.

> A properly constructed loop should be transformer matched
> to keep the loop balanced and both the coaxial cable and power
> cable must be exceptionally well isolated from the loop.

Exactly right

> A low noise figure high gain preamp is essential.

I've tried that on my loops, and all it does is make
the S-meter move more.  No audible difference.

> Frank
> W3LPL
>

73
Rick N6RK
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Topband: VP8STI last night - Report from Cape Town

[Raoul Coetzee via Topband]

The pattern in ZS the last couple of nights was the same:Nada till about 23:30 
UTC, then they would come out of the noise or just above the noise. Although 
the distance is not that long, (abt 4300Km ), it seems the path is only in 
"good" darkness for a short while. (It is of course summertime here with 32 
plus degrees C in the day)
I managed to work them around 00:06 UTC.Looking forward to their log update!
Raoul, ZS1C 

  From: Gary Smith 
 To: Topband@contesting.com 
 Sent: Saturday, January 23, 2016 5:54 AM
 Subject: Re: Topband: VP8STI last night - Report from Maryland
   
Bill,

Never say never. I worked them at 02:13 last night (Thanks Roger for 
the email today saying you'd heard the contact). It was right after 
they stopped working EU and I was waiting patiently on frequency till 
I heard them CQ without the EU designator. 

The Hi-Z triangular was a saving grace for me, I would like one of 
the Hi-Z 8A variety.

Anyone have one to let go of? I'm also interested in a NCC-1; contact 
me off list if you would.

73,

Gary
KA1J

> 
> From Maryland, FM 19:
> 
> Armchair copy last nite from 2350Z until 0215Z this morning.  Some fading.
> With my headphones laying on the bench, they were Q5 solid copy while 
> I was working on other projects waiting for them to call for "NA" instead of
> "EU".
> Never happened.
> 
> I stayed & listened until 0215Z when they faded out here.
> 
> I'm using a Hi-Z 4-sq.  Azimuth heading to VP8S is 155 Deg.  4-SQ heading
> used was 134 Deg.
> 
> Bill N3RR
> 
> -Original Message-
> From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Ken Boasi
> Sent: Friday, January 22, 2016 12:18 PM
> To: topband@contesting.com
> Subject: Re: Topband: VP8STI last night
> 
> Just my observations from what happened here last night in NY (doesn't help
> you west coast guys, I guess). 
> 
> VP8STI was solid copy from my sunset around 2230z until 0200z. Very little
> fading and Q5 copy. They were calling and working EU only during this
> period. 
> 
> Around 0200z, their signal got much weaker and more susceptible to QSB. They
> also started calling for anyone at that time, not just EU. I don't know if
> they switched direction on their TX array or not at that point, but things
> did get worse at that point; propagation I'm assuming. 
> 
> I use two 560' beverages to receive, one at 135 degrees and one at 180
> degrees. No diversity rx, just switching back and forth. They were the same
> copy on both antennas, generally, since both are about the same amount "off"
> of STI's hearing from here (FN13, western NY). 
> 
> I didn't listen much after 0200z, so I don't know if their signal came back
> up at any point. 
> 
> They did have an excellent run of EU during that 2200-0200 time frame,
> though. 
> 
> 73, Ken N2ZN 
> 
> > On Jan 22, 2016, at 11:11 AM, Tom  wrote:
> > 
> > N6SS is located about 40 miles north west of me in AZ,, 2800 feet higher
> in elevation and a lot quieter location,,and better receiving antennas,, I
> have not heard but just traces past 2 nights,, will be there tonight,, been
> listening to the east coast guys working them,, all signals have been great
> except Vp8!! Congrats to all that have worked them and maybe tonite the
> propagation gods will shine west!!! 
> > 73's
> > Tom
> > 
> > -Original Message-
> > From: Tree 
> > Sender: "Topband" 
> > Date: Fri, 22 Jan 2016 06:57:33
> > To: 160
> > Subject: Topband: VP8STI last night in Oregon
> > 
> > At least in my location - I would say that things were no better last
> night.
> > 
> > N6SS in Arizona said he worked them just after 0400Z.  There was also 
> > a report that he came back to N6MB about 10 times around 0430Z - but 
> > N6MB was not hearing him.  The data suggests they are hearing better 
> > than getting out - which means if you can hear them - the spotlight is 
> > shining on you and you have a pretty good chance of making the QSO.
> > 
> > If it was easy - it wouldn't be as rewarding when it happens!!
> > 
> > Good luck to all.
> > 
> > 73 Tree N6TR
> > Hillsboro, OR

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Re: Topband: Strange propagation

[Raoul Coetzee via Topband]

Well said Herb!
Raoul ZS1C
 

  From: Herbert Schoenbohm 
 To: topband@contesting.com 
 Sent: Friday, January 15, 2016 3:14 AM
 Subject: Re: Topband: Strange propagation
   
Jim,

  Artificial insemination is advanced technology also but pray tell me 
that it is more fun.  We are not taking about an either- or situation of 
"embracing progress in amateur radio" at all. What some of us eschew is 
the replacement of what was here to for a relatively stable paradigm and 
replacing it with something that is much different.  Stew Perry, W1BB, 
Charlie O Brien, W2EQS, and Bryce W9PNE did with what they had and made 
us proud of their accomplishments and contributions. Now Stew did not 
get in his car and use the super powered MacKay  coastal stations near 
by to work 160 meters. He took a right turn to his hamshack location at 
an old lighthouse, put up a zepp antenna,  and worked the first 160 
meter DXCC with 100 watts.  Some may call this "old school" but this is 
precisely what topbanders were all about. I hate to see this lost in 
`some pay to play scheme in the future.


Herb Schoenbohm, KV4FZ
On 1/14/2016 9:00 PM, Jim Murray via Topband wrote:
>  " SO what is the beef?  RHR is just another form of progress due to advances 
>in technology, if we did not embrace progress in ham radio technology we would 
>all still be talking to one another on Lunch boxes and Gooney boxes! "
>
> Problems begin when technology changes ethics.
> Jimk2hn
>
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Re: Topband: strange propagation

[Raoul Coetzee via Topband]

Herb, I am with you on this one.I know my 160m dxcc will ,one day, go to trash. 
Thats ok.At least I worked for it, you know, it took me a long time to get your 
call in the qrn, and I was a green horn! from a small lotwith a great 
ambition.Now that is more valuable to me than anything else.73Raoul Zs1C, ex 
ZS1REC
 

  From: Herbert Schoenbohm 
 To: topband@contesting.com 
 Sent: Friday, January 15, 2016 5:25 PM
 Subject: Re: Topband: strange propagation
   
This issue is ripe for discussion now.  I should not be relegated to an 
out of sight out of mind position.  It bothers many and is OK with 
some.  It speaks to the soul of amateur radio and everything it stands 
for. if we don't deal with it know  maybe in a few years that ham shacks 
will only consist of computers. No radios, no antennas, nada. Be very 
careful what you wish for. And please don't use the "emerging 
technology" argument because it is specious.



Herb Schoenbohm, KV4FZ

On 1/15/2016 11:04 AM, Jim Garland wrote:
> Guys, seems to me this topic has been worked to death. Maybe it's time to
> give it a rest.
> Jim W8ZR
>
>
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