Re: Topband: Made it! 80 Years a Ham

[Douglas Ruz / CO8DM]

Hey Paul,

Happy 80th anniversary .

I started with 13 years old this fantastic hobby.

Nice to hear you are still active !!...What an inspiration !!!

73 and take care.

Doug, CO8DM

- Original Message - 
From: "PAUL M ELLIOTT" 

To: 
Sent: Thursday, January 19, 2017 10:34 AM
Subject: Topband: Made it! 80 Years a Ham



Made it! 19 January 2017, is the 80th anniversary of my first ham license,
Class C operating privileges with W5GGV as my call. Was 14 years old at 
the

time. A little over a year later I upgraded to Class A.  Many years later
the Extra Class (with no added privileges) came along. Upgraded. Some 
years

later the FCC announced that hams with an Extra Class license who had been
licensed 25 years could apply for a two -letter call, no place on the
application to request of a specific call.  Was assigned W5DM.

First rig made from junked Atwater Kent radio parts. First antenna was a
wire going out a hole in the window screen to a tree.  First DX was VK2SS 
on

40 m CW, September 1937. (An aside. There were no phone privileges on 40 m
for USA hams). The VK2SS QSL card is hung on my wall. My card to him was
written on a postcard (Great Depression=no money to buy QSL cards).

Been fairly active over the years, except, of course, for WW II.  If
interested in WW II, you can do a web search on DD 792 for a small part of
my history.

The first 20 or 30 years I built my transmitters (all low powered) and
receivers. Operated CW only until SSB came along. Then I built a low 
powered
phasing rig. A BC-348H receiver was made dual conversion using 85 kcs 
(kcs
then= kHz now) IF transformers from a BC 453 receiver.   Had a blast 
working

the world with a homebuilt "cubical quad" on 20 meters.  Since then mostly
CW.

I may have made one small contribution to ham radio.  In the April 1958
issue of QST, in Technical Correspondence there was a letter from me that, 
I

think, was the first mention in a ham publication that the formula for
determining the length of a "cubical quad" antenna was not correct.  Since
my measurements were made using a BC 348, a grid dip oscillator, and a 100
kcs crystal oscillator. I don't know whether I was just lucky to get as
close as I did or did a fairly good job with what I had.

In the early 1990s started out to get 160 m WAS from a 120 x 120 foot
electrically noisy city lot (SE NM) with a long ( ~3/8 wavelength)  but 
low
semi-inverted L antenna.  Ground radials of varying length in one 90 
degree
segment. Made 160 m WAS.   Then started chasing DX.  Now have 189 
countries

confirmed on 160 m, 324 on all bands.

Age, not surprisingly, has taken its toll.  CW now down to 20-25 wpm-at 
one
time it was 35-40 wpm.  Finger dexterity way down-has taken me over 3 
hours
to type this email. Physical realities remain physical realities--I am now 
a

disabled, crippled old man. But---

No complaints-many people are worse off than I am.

Thanks to all who have had the knowledge and the kindness to help me over
the years.

73 Paul W5DM









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Este mensaje le ha llegado mediante el servicio de correo electronico que 
ofrece la Federacion de Radioaficionados de Cuba. La persona que envia este 
correo asume el compromiso de usar el servicio y cumplir con las regulaciones 
establecidas. FRCUBA: https://www.frcuba.cu/

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Topband: 160 and 80m antenna...

[Douglas Ruz / CO8DM]

Hi Topbanders !!!;

Finally I got an FCP isolation transformer for 160m...I am planning install a 
160m Inv L + FCP...I am wondering if I can add 80m to this system.

I know the 160m FCP isolation transformer only work on 160m but maybe adding a 
relay is possible to work on 80m.

Any idea?

Thanks,

Doug, CO8DM
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Topband: Horizontal Waller Flag (Single or double)...

[Douglas Ruz / CO8DM]

Hi,

I have a 5 elem 6m yagi...the boom is 15 ft long...

I have been reading about the Waller Flag...both version, Vertical and
Horizontal.

I would like add the WF to my 6m yagi or a single WF (one loop)...I know few
hams around the world did it and there is no interaction. (PY1RO, PY2XB,
etc)

My  tower is 50 ft high...I know it is too low for 160m but I can not
install the Vertical version...my city lot is small and I have an Spiderbeam
on top (abt 6 ft above the 6m yagi)

any idea ?

Thanks,

Doug, CO8DM


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Topband: Phone segment for EU stations on 75 meters?

[Douglas Ruz / CO8DM]

Hi,

What is the Phone segment for EU stations on 75 meters?

I am tunning my 75/80m antenna for WAE SSB... it is very narrow (100 Khz), so, 
I want to know the most active segment during contest...Resonance (SWR 1:1) on 
3625 Khz now...Is it Ok or to low?...maybe can work split...

Thanks,

Doug, CO8DM
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Topband: Ground screen ????

[Douglas Ruz (CO8DM)]

Hi,

Need some ideas from your side...

I am trying to find a good solution for my 160/80m antenna.

I am thinking about some kind of Inv L with an 80m trap as a radiator for both 
bands.

But, what about the counterpoise...Unfortunately in my small city lot I can´t 
install radials and I can´t get parts for the FCP yet...what about a Ground 
screen ???...I have a galvanized roof...it is about 50 ft long and 16 ft 
wide...galvanized sheets are 3 by 8 ft long and all are bolted together. The 
roof is about 15 ft high.

Can I use this roof as a ground screen for the 160/80m antenna ???

Thoughts ?,

73Douglas, CO8DM
P.S:1- I finish my 50 ft tower installation.
   2- Thanks for all QSO´s on 160m before ARRL CW contest with me and with 
our contest   station T48K.

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Topband: How can I tune an FCP without isolation transformer ???

[Douglas Ruz (CO8DM)]

Hi Topbanders,

I am building an Inv L for 160m with FCP.

As i can get an isolation transformer i will add a series loading coil (about 
17uH) to my FCP and then an RF choke.

How can i tune my FCP + Loading coil ??...i need a balance between FCP+Loading 
coil and the Radiator.

Can i build 2 FCP with loading coils and tune like a dipole with my 
MFJ-259???...then remove one of the FCP´s or keep both.

Thoughts ??

73Douglas, CO8DM

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Re: Topband: How can I tune an FCP without isolation transformer ???

[Douglas Ruz (CO8DM)]

Correction:

I mean i CAN NOT get an isolation transformer...

73Douglas, CO8DM

"No creo que haya alguna emoción más intensa para un inventor que ver alguna 
de sus creaciones funcionando. Esa emoción hace que uno se olvide de comer, 
de dormir, de todo." - Nikola Tesla
- Original Message - 
From: "Douglas Ruz (CO8DM)" <co...@frcuba.co.cu>

To: <topband@contesting.com>
Sent: Monday, February 01, 2016 2:49 PM
Subject: Topband: How can I tune an FCP without isolation transformer ???


Hi Topbanders,

I am building an Inv L for 160m with FCP.

As i can get an isolation transformer i will add a series loading coil 
(about 17uH) to my FCP and then an RF choke.


How can i tune my FCP + Loading coil ??...i need a balance between 
FCP+Loading coil and the Radiator.


Can i build 2 FCP with loading coils and tune like a dipole with my 
MFJ-259???...then remove one of the FCP´s or keep both.


Thoughts ??

73Douglas, CO8DM

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Topband: Bent verticals ???

[Douglas Ruz (CO8DM)]

Hi Topbanders,

I have been reading the article "Compact 4 squares and other ways to get gain 
on 40, 80 and 160m" written by K9RS and N9NB. It is very interesting.

Someone on the list with experience can answer few questions off the list.

I would like install something like that on low bands (monobanders for 160, 80 
and 40m). 

Thanks,

73Douglas, CO8DM

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Re: Topband: Ideas for xmit antennas for new QTH in KH6

[Douglas Ruz (CO8DM)]

Hi,

Read this article written by Rudy, N6LF:

http://rudys.typepad.com/ant/files/antenna_array_single_support.pdf

Maybe you can find your solution.

GL,

73Douglas, CO8DM / T49A
Founder of T48K

"No creo que haya alguna emoción más intensa para un inventor que ver alguna 
de sus creaciones funcionando. Esa emoción hace que uno se olvide de comer, 
de dormir, de todo." - Nikola Tesla
- Original Message - 
From: "Cqtestk4xs--- via Topband" 

To: 
Sent: Wednesday, December 09, 2015 5:34 PM
Subject: Topband: Ideas for xmit antennas for new QTH in KH6



Next year I'll be building a new home and station in  Hawaii.

40 through 6 meters is already set in stone, but 80 and 160 are  still
cloudy.

Here's the setup:

I'm allowed one tower maximum 90 ft.  The tower will be 90 ft  of Rohn 55
using a K0XG rotating system with two rings.  It will be guyed  using
fiberglass guys.  There will be a bunch of HF VHF stuff on the  tower. 
Three
tribanders, two 12/17 meter Yagis, a 40 meter Yagi and way  down on the 
bottom

two 6 meter antennas.

The tower sits on VERY uneven ground.  Although the lot   measures 12
acres, I am using only the top three and renting out the rest of the  land 
to a

farmer to keep taxes from being crazy high.

The ground is pure alluvial red fine particle soil (no stones) and  has a
depth of about 6 feet before hitting rock. Since the east side of  Hawaii
gets at least 100 inches of rain a year it is usually pretty  moist.  I 
would

assume the soil is at least average or better in  conductivity.  I can run
ropes, wires etc off the tower at the 80 and 40  foot guy points, but can 
not
connect directly to the tower since the tower  rotates.  The is no room 
for

a rotating dipole on the tower for  80.

I've used quad triangle loops before with the pointed end on the  bottom
suspended by wires and am leaning towards that since the ground is so 
uneven

and the terrain difference would be a real negative for a 4 square (I
think).

On 160 I'm leaning toward a wire vertical suspended from a rope  coming
from the tower which would make the antenna about 65 or 70 feet tall and 
to

compensate for that I would make it a T-top.

For rx I have lots of room to run a 700 -900 Beverage to JA and  another 
to

EU/USA direction, so that isn't a problem.

I do need suggestions for my 80 and 160 tx situation.  Any  ideas?
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Re: Topband: 4SQ around tower

[Douglas Ruz (CO8DM)]

Hi Rudy,

Maybe i am wrong but i think Jorge, CX6VM/CW5W has something similar for 
160m.


Try contact him and ask about his experience.

I think he is member of this list.

GL with the project.

73Douglas, CO8DM / T48K

"No creo que haya alguna emoción más intensa para un inventor que ver alguna 
de sus creaciones funcionando. Esa emoción hace que uno se olvide de comer, 
de dormir, de todo." - Nikola Tesla
- Original Message - 
From: "Rudy Bakalov via Topband" 

To: "Arthur Delibert" 
Cc: 
Sent: Sunday, December 06, 2015 8:07 PM
Subject: Topband: 4SQ around tower


I am in the process of clearing land for full size 80m 4SQ. I have two 
questions for the group:


1) How much and what kind of degradation should I see if I place the 4SQ 
elements around my tower. The tower is 90' and has a 4 el 40 m yagi at 90' 
and 6 el tribander at 105'. Currently I have no plans to detune the tower, 
but do have plans to use it as a 160m TX antenna.


2) If the consensus is to move the 4SQ away from the tower, how far should 
I move it? Also, in what direction should I move it with respect to the W 
and S elements of the 4SQ.


Rudy N2WQ

Sent using a tiny keyboard.  Please excuse brevity, typos, or 
inappropriate autocorrect.

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Re: Topband: WAS 160

[Douglas Ruz (CO8DM)]

I heard N4OGW from MS last night...

73Douglas, CO8DM

"No creo que haya alguna emoción más intensa para un inventor que ver alguna 
de sus creaciones funcionando. Esa emoción hace que uno se olvide de comer, 
de dormir, de todo." - Nikola Tesla
- Original Message - 
From: "Peter Sundberg" 

To: 
Sent: Saturday, December 05, 2015 5:05 AM
Subject: Topband: WAS 160


This morning, for the first time in a couple of years, I could hear/work a 
number of NA stations again with good signals.


This leads me to believe that I can finally complete WAS 160m this season 
by working someone in MS. Been stuck at 49 states for 4 years now...


Any suggestions as to who is active from MS on 160m with a good station? I 
am located at Lat 65.4N so geomagnetic disturbances are a big issue. The 
bigger the station is at the other end, the better.


73
Peter SM2CEW






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Topband: CO8DM on 1861 Khz CW...

[Douglas Ruz (CO8DM)]

Hi,

I am calling on 1861 Khz...only 100 watts.

If someone would like to try.

73Douglas, CO8DM

"No creo que haya alguna emoción más intensa para un inventor que ver alguna de 
sus creaciones funcionando. Esa emoción hace que uno se olvide de comer, de 
dormir, de todo." - Nikola Tesla
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Re: Topband: CO8DM on 1861 Khz CW...

[Douglas Ruz (CO8DM)]

Ok Jeff...1870 is clean.

I move to 1870 Khz

73Douglas, CO8DM

"No creo que haya alguna emoción más intensa para un inventor que ver alguna 
de sus creaciones funcionando. Esa emoción hace que uno se olvide de comer, 
de dormir, de todo." - Nikola Tesla
- Original Message - 
From: "Jeff AC0C" <keepwalking...@ac0c.com>

To: "Douglas Ruz (CO8DM)" <co...@frcuba.co.cu>; <topband@contesting.com>
Sent: Saturday, December 05, 2015 11:22 PM
Subject: Re: Topband: CO8DM on 1861 Khz CW...



Douglas,

You may want to move up a bit more.  There is an AM broadcast on 1860.

73/jeff/ac0c
www.ac0c.com
alpha-charlie-zero-charlie

-Original Message- 
From: Douglas Ruz (CO8DM)

Sent: Saturday, December 05, 2015 10:16 PM
To: topband@contesting.com
Subject: Topband: CO8DM on 1861 Khz CW...

Hi,

I am calling on 1861 Khz...only 100 watts.

If someone would like to try.

73Douglas, CO8DM

"No creo que haya alguna emoción más intensa para un inventor que ver 
alguna de sus creaciones funcionando. Esa emoción hace que uno se olvide 
de comer, de dormir, de todo." - Nikola Tesla

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Re: Topband: CO8DM on 1861 Khz CW...

[Douglas Ruz (CO8DM)]

i am now on 1827.5 Khz

73Douglas, CO8DM

"No creo que haya alguna emoción más intensa para un inventor que ver alguna 
de sus creaciones funcionando. Esa emoción hace que uno se olvide de comer, 
de dormir, de todo." - Nikola Tesla
- Original Message - 
From: "Douglas Ruz (CO8DM)" <co...@frcuba.co.cu>

To: "Jeff AC0C" <keepwalking...@ac0c.com>; <topband@contesting.com>
Sent: Saturday, December 05, 2015 11:25 PM
Subject: Re: Topband: CO8DM on 1861 Khz CW...


Ok Jeff...1870 is clean.

I move to 1870 Khz

73Douglas, CO8DM

"No creo que haya alguna emoción más intensa para un inventor que ver alguna
de sus creaciones funcionando. Esa emoción hace que uno se olvide de comer,
de dormir, de todo." - Nikola Tesla
- Original Message - 
From: "Jeff AC0C" <keepwalking...@ac0c.com>

To: "Douglas Ruz (CO8DM)" <co...@frcuba.co.cu>; <topband@contesting.com>
Sent: Saturday, December 05, 2015 11:22 PM
Subject: Re: Topband: CO8DM on 1861 Khz CW...



Douglas,

You may want to move up a bit more.  There is an AM broadcast on 1860.

73/jeff/ac0c
www.ac0c.com
alpha-charlie-zero-charlie

-Original Message- 
From: Douglas Ruz (CO8DM)

Sent: Saturday, December 05, 2015 10:16 PM
To: topband@contesting.com
Subject: Topband: CO8DM on 1861 Khz CW...

Hi,

I am calling on 1861 Khz...only 100 watts.

If someone would like to try.

73Douglas, CO8DM

"No creo que haya alguna emoción más intensa para un inventor que ver 
alguna de sus creaciones funcionando. Esa emoción hace que uno se olvide 
de comer, de dormir, de todo." - Nikola Tesla

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Topband: i am calling on 1827.5 Khz now

[Douglas Ruz (CO8DM)]

73Douglas, CO8DM

"No creo que haya alguna emoción más intensa para un inventor que ver alguna de 
sus creaciones funcionando. Esa emoción hace que uno se olvide de comer, de 
dormir, de todo." - Nikola Tesla
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Re: Topband: CE1TBN

[Douglas Ruz (CO8DM)]

Congratulations Marco ...good job !!!

73Douglas, CO8DM

"No creo que haya alguna emoción más intensa para un inventor que ver alguna 
de sus creaciones funcionando. Esa emoción hace que uno se olvide de comer, 
de dormir, de todo." - Nikola Tesla
- Original Message - 
From: "Marco Quijada" 

To: "Topband" 
Sent: Sunday, September 06, 2015 11:06 AM
Subject: Topband: CE1TBN



I am happy I made 20 qso. 4 new one.

Thank you

CE1TBN
Happy Ham

El jueves, 3 de septiembre de 2015, Marco Quijada 
escribió:


Good. I ll try to catch you

CE1TBN

El jueves, 3 de septiembre de 2015, sulaiman Aljedaie 7Z1SJ <
s7z...@gmail.com >
escribió:


hello CE1TBN
i will be on All Asia contest this weekend CU
73.s

2015-09-01 16:00 GMT+03:00 Marco Quijada :

I will be on 80 meters this weeked. I am lookig for any qso I have a 
few

qso with my call.
 I can work CW also

CE1TBN
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Topband: Waller Loop ???

[Douglas Ruz (CO8DM)]

Hi Topbanders,

I have been reading about Waller Loop in the last couple of days...it is an 
amazing antenna for low bands.


I tried answers few questions but i can´t...need help from the list:

About building...can i use aluminum tubing to build the loop and the 30ft 
boom ???...if i can use aluminum tubing i dont need fiber glass...fiber 
glass is  not available here.


My second question is about polarization...i see few pictures some verticals 
and some horizontal...what is the difference???...what is the best ???.


Thanks !!!,

73Doug, CO8DM

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Re: Topband: Fast relay ???

[Douglas Ruz (CO8DM)]

Thanks for your help Petr 

73Douglas, CO8DM

"No creo que haya alguna emoción más intensa para un inventor que ver alguna 
de sus creaciones funcionando. Esa emoción hace que uno se olvide de comer, 
de dormir, de todo." - Nikola Tesla
- Original Message - 
From: "Petr Ourednik" <indi...@xsmail.com>
To: "Douglas Ruz (CO8DM)" <co...@frcuba.co.cu>; <topband@contesting.com>; 
<mar...@ok1rr.com>

Sent: Monday, August 31, 2015 12:23 PM
Subject: Re: Topband: Fast relay ???


Doug

I am going to ship you the relays for free. Just let me know to address
and phone number for parcel service.

73 - Petr, OK1RP

On Mon, Aug 31, 2015, at 04:15 AM, Douglas Ruz (CO8DM) wrote:

Martin, Tom and all members of the list,

The AS RXFEP is very nice but it is very expensive.

I prefer the KD9SV modify by Martin, OK1RR...it is very easy to build but
i
need only the relays...someone can help me to get those relays ???...are
they available at digikey or mouser ???

The circuit is very easy to duplicate but i just need the fast relays.

Thanks,

73Douglas, CO8DM

"No creo que haya alguna emoción más intensa para un inventor que ver
alguna
de sus creaciones funcionando. Esa emoción hace que uno se olvide de
comer,
de dormir, de todo." - Nikola Tesla

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Re: Topband: KD9SV-OK1RR relays ???

[Douglas Ruz (CO8DM)]

Tom and all members of the list thanks for your ideas and time .

I have a plan B:

I added a BNC female connector in the rear panel of my old Yaesu, FT747 (It 
is an FT80C, the commercial version with metallic chassis) few months ago.


I was using that BNC to feed an SDR receiver using the same antenna.

If i add a SPDT switch also on the rear panel and RE-WIRE the BNC connection 
i can get an RX port in my old radio and can connect an RX antenna...like 
modern radios...Switch Pos A (main antenna at SO239)...Pos B (SO239 for TX 
and BNC for RX)...i made few mods to my radio, so, i know it very well...


Maybe that will help...of course, i must add then an Front End Saver...still 
need a fast relay !!!


Maybe the Plan A with a 5mS relay will be more easy...still need a fast 
relay too !!!


73Douglas, CO8DM

No creo que haya alguna emoción más intensa para un inventor que ver alguna 
de sus creaciones funcionando. Esa emoción hace que uno se olvide de comer, 
de dormir, de todo. - Nikola Tesla
- Original Message - 
From: Tom W8JI w...@w8ji.com
To: Charles Cu nningham charlie-cunning...@nc.rr.com; 'topBand List' 
topband@contesting.com

Sent: Sunday, August 30, 2015 12:27 AM
Subject: Re: Topband: KD9SV-OK1RR relays ???


It seems to me that a very fast operating preamp protection circuit could 
be
constructed employing a good fast saturating NPN switching transistor 
across

the antenna path. In receive mode the collector-base junction would have
substantial reverse bias and the transistor can be chosen for low
collector-base capacitance. With a fast switch like a 2N708 or something
similar the switching time will, of course, FAR outperform a relay 
closure

time.



This thread might have splintered. I was responding to this:

Your FT-747 only has one antenna input. It does not have a second
receiver. It doesn't even have a receive-only antenna input. You cannot
transmit and receive at same time. Why do you need a front end saver?


If it is a transceiver without an RX antenna point, the problem is adding 
a receive antenna to a transceiver that does not have a receive port.


If it is a transceiver with an RX port, the requirement for an external 
front end saver and what will work depends on the antennas, the power, 
the transceiver, and the antenna spacing.


A front end saver can be very simple with some radios, more complicated, 
or not needed at all.


An external switch is never easy to do correctly, unless the radio has 
good TX RX switching time sequencing.


I'm unclear what the application is, but a 10 mS relay is really too slow 
for either application. The sequencing issues I pointed out apply to both 
systems.


73 Tom
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Topband: Fast relay ???

[Douglas Ruz (CO8DM)]

Martin, Tom and all members of the list,

The AS RXFEP is very nice but it is very expensive.

I prefer the KD9SV modify by Martin, OK1RR...it is very easy to build but i 
need only the relays...someone can help me to get those relays ???...are 
they available at digikey or mouser ???


The circuit is very easy to duplicate but i just need the fast relays.

Thanks,

73Douglas, CO8DM

No creo que haya alguna emoción más intensa para un inventor que ver alguna 
de sus creaciones funcionando. Esa emoción hace que uno se olvide de comer, 
de dormir, de todo. - Nikola Tesla 


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Topband: Folded CounterPoise ???

[Douglas Ruz (CO8DM)]

Hi,

Originally, the FCP is connected in the center (33ft each side for 
160m)...Did somebody try connect it at one END ???.


Probably i will install my vertical in a corner of my property and some 
neighbours houses do not allow connect the FCP in the middle.


any idea?

Thanks,

73Douglas, CO8DM

No creo que haya alguna emoción más intensa para un inventor que ver alguna 
de sus creaciones funcionando. Esa emoción hace que uno se olvide de comer, 
de dormir, de todo. - Nikola Tesla


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Topband: KD9SV-OK1RR relays ???

[Douglas Ruz (CO8DM)]

Hi Martin, OK1RR,

I tried email direct to you but it was not possible. I am sorry about the 
other member of the list.


It is about the FRONT END SAVER relays:

I have two different relays here and i would like to know if i can use one 
of them in

your design:

I have HFD2 Subminiature DIP relay:
-Matching standard 16 pin socket.
-DPDT
-100 million operations
- Operate time 4ms and release time 3ms.
-Capacitance: Contact to coil 5pF and contact set to contact 1,5 pF

I have also HFD41 relay:
-SPDT relay
-10 million operations
-Operation time 10mS
-Not sure about capacitance.

Maybe i have to RE-DESIGN the PCB but that is very easy.

Any idea???...Thanks,

73Douglas, CO8DM


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Re: Topband: KD9SV-OK1RR relays ???

[Douglas Ruz (CO8DM)]

Tim,

Yes, you are absolutely right 

Thanks,

73Douglas, CO8DM

No creo que haya alguna emoción más intensa para un inventor que ver alguna 
de sus creaciones funcionando. Esa emoción hace que uno se olvide de comer, 
de dormir, de todo. - Nikola Tesla
- Original Message - 
From: Tim Shoppa tsho...@gmail.com

Cc: topBand List topband@contesting.com
Sent: Saturday, August 29, 2015 3:05 PM
Subject: Re: Topband: KD9SV-OK1RR relays ???



Doug -
 Your FT-747 only has one antenna input. It does not have a second
receiver. It doesn't even have a receive-only antenna input. You cannot
transmit and receive at same time. Why do you need a front end saver?

 If you are adding an outboard relay keyed from the amp control line of
the FT-747 to allow you to have separate transmit and receive antennas,
that's great. Any old relay with less than 10ms make/break time will work
fine there. You still don't need a front end saver, because your rig
still cannot be hooked to both transmit and receive antenna at same time.

Tim N3QE




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Re: Topband: RX antenna ???

[Douglas Ruz (CO8DM)]

I totally agree with you Steve...i will try the flag first without preamp 
and see how it play.


Actually, i will have a short coax run...about 30 or 40 ft...

73Douglas, CO8DM

No creo que haya alguna emoción más intensa para un inventor que ver alguna 
de sus creaciones funcionando. Esa emoción hace que uno se olvide de comer, 
de dormir, de todo. - Nikola Tesla
- Original Message - 
From: wb6r...@mac.com

To: Top Band List List topband@contesting.com
Sent: Friday, August 28, 2015 8:03 PM
Subject: Re: Topband: RX antenna ???


Getting back to CO8DM's original question about a preamp to use with a flag. 
If the receiver noise level pops up and then drops when a receive antenna is 
connected and then disconnected, then it’s likely that a preamp may not be 
needed at all.


When I first played with a coaxial loop, a preamp was necessary. Since going 
to a full size flag, I find that I seldom even bother turning on a external 
preamp. I do have a relatively short coax run of about 75 ft from the flag 
to the receiver.


I’d try the flag first without building/buying a preamp and see how it 
plays.


Steve WB6RSE
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Re: Topband: RX antenna ???

[Douglas Ruz (CO8DM)]

Thanks Tony,

I am using an old Yaesu, FT747...it is only one antenna connector on that 
radio, so, i have to do a circuit for switching RX and TX antennas and also 
a preamplifier for the flag antenna...right???


73Douglas, CO8DM

No creo que haya alguna emoción más intensa para un inventor que ver alguna 
de sus creaciones funcionando. Esa emoción hace que uno se olvide de comer, 
de dormir, de todo. - Nikola Tesla
- Original Message - 
From: N2TK, Tony tony@verizon.net

To: 'Douglas Ruz (CO8DM)' co...@frcuba.co.cu
Sent: Thursday, August 27, 2015 10:27 AM
Subject: RE: Topband: RX antenna ???


Hi Douglas,
I use Flag and Pennant antennas. The most room OI have for a beverage is
300'. The Flag and Pennants were always better. Tried Ewe's, but they are
ground dependent.
1000 ohm should be close enough.

If the receive antenna is close to the transmit antenna you may need to have
a signal limiter on the receive input. Or maybe a fast acting relay to
ground the receive antenna when transmitting.

GL
N2TK, Tony

-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Douglas
Ruz (CO8DM)
Sent: Thursday, August 27, 2015 10:14 AM
To: topband@contesting.com
Subject: Topband: RX antenna ???

Hi,

I will install a vertical antenna for TX on 160, 80 and 40m.

I want build a Receiving antenna for those Low Bands.

I live in a city lot, so, i can not install beverages...i have been reading
in the Low Band Dxing about Receiving Loops and i like the Rectangular loop
developed by EA3VY and K6SE.

Anyway, i would like hear your ideas.

The Termination Resistor is 950 ohms in the design but i have 1000 carbon
resistor...any idea??

Thanks,

73Douglas, CO8DM

No creo que haya alguna emoción más intensa para un inventor que ver alguna
de sus creaciones funcionando. Esa emoción hace que uno se olvide de comer,
de dormir, de todo. - Nikola Tesla

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Topband Reflector Archives - http://www.contesting.com/_topband

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Re: Topband: RX antenna ???

[Douglas Ruz (CO8DM)]

I have 2 more questions:

About the resistor: what kind of material???...carbon, right? and what power 
will disipate the resistor ?

The 2nd questions is about the transformer: i have some binocular and toroids 
but small ones, BN-43-202 and FT50-43...maybe adding few FT50-43 can BUILD 
some kind of larger binocular...any idea?

Thanks,

73Douglas, CO8DM

No creo que haya alguna emoción más intensa para un inventor que ver alguna de 
sus creaciones funcionando. Esa emoción hace que uno se olvide de comer, de 
dormir, de todo. - Nikola Tesla
  - Original Message - 
  From: Tim Shoppa 
  To: Douglas Ruz (CO8DM) 
  Sent: Thursday, August 27, 2015 10:46 AM
  Subject: Re: Topband: RX antenna ???


  Any sort of loop you can put in, will be a superior receiving antenna to 
using your transmitting antenna.


  Most of the simple loops have a terminating resistor that is 400 to 1200 ohms 
depending on details.


  I use a K9AY loop. Different loops have different mounting and termination 
needs.



  Difference between 1000 ohms and 950 ohms for terminating resistor, is pretty 
inconsequential.


  Tim N3QE


  On Thu, Aug 27, 2015 at 10:13 AM, Douglas Ruz (CO8DM) co...@frcuba.co.cu 
wrote:

Hi,

I will install a vertical antenna for TX on 160, 80 and 40m.

I want build a Receiving antenna for those Low Bands.

I live in a city lot, so, i can not install beverages...i have been reading 
in the Low Band Dxing about Receiving Loops and i like the Rectangular loop 
developed by EA3VY and K6SE.

Anyway, i would like hear your ideas.

The Termination Resistor is 950 ohms in the design but i have 1000 carbon 
resistor...any idea??

Thanks,

73Douglas, CO8DM

No creo que haya alguna emoción más intensa para un inventor que ver 
alguna de sus creaciones funcionando. Esa emoción hace que uno se olvide de 
comer, de dormir, de todo. - Nikola Tesla 
_
Topband Reflector Archives - http://www.contesting.com/_topband


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Topband Reflector Archives - http://www.contesting.com/_topband

Re: Topband: Best wire antenna for roof top location

[Douglas Ruz]

I agree with Mirko...sloping dipoles is the best choice for Nuradi 
location...THE LOW BAND DXING book

is very clear.

If SEA WATER is close it is better.

73Douglas, CO8DM

No creo que haya alguna emoción más intensa para un inventor que ver alguna
de sus creaciones funcionando. Esa emoción hace que uno se olvide de comer,
de dormir, de todo. - Nikola Tesla
- Original Message - 
From: Mirko S57AD miroslav.sibi...@amis.net

To: Nuradi yb0...@gmail.com
Cc: topband@contesting.com
Sent: Saturday, August 08, 2015 3:03 PM
Subject: Re: Topband: Best wire antenna for roof top location



Nuradi, how about halfwave sloping dipoles hung digonally from the top of
the building?  Some 30 years ago at YU1EXY we had contest shack at top of
60m tall building with student's dormitory.  In spite the building was in
the middle of city noise, sloping dipoles played extremely well. Later we
replaced sloping dipoles with sloped yagis for 80m (3 el toward NW (USA)
and 2 el toward NE (Japan).   With halfwave sloping dipole we managed to
QSO KH6 on 160m, very though contact from this part of Europe.  Maybe
building acted as kind of reflector on this band...

73,  Mirko, S57AD

2015-08-08 1:52 GMT+02:00 Nuradi yb0...@gmail.com:


Dear all,

In preparation of this coming WW big contest, I plan to install wire
antenna
on a roof top of a 33rd storey building (about 110metres above the
ground)
for operating on the 160M, 80M and  40M band.



The building roof top rectangular size about  45 metres long (from
NWtoN-326.8 degress to SEtoS-146.8degrees) and 33 metres wide
(fromNEtoE-56.8 degrees to SWtoW-236.8 degrees) located in centre of
Jakarta
city.



The roof top have plenty of cellulair microwave operator antennas
(operating
in 5GHz and above ALSO one TV operator with around 400MHz working freq.)
and
there are also two SelfSupportingTower-15metres high, on each end of the
long side of the building.

There is also one-SST belong to theTV operator which is about 50 metres
high, located on the SE end of the roof top.

Good grounding terminal is available as it's used for grounding all the
communication antennas/equipments.

I have my own room in the centre of the roof top where we put all our
indoor
microwave devices and routers/switch.



Prefereable wire antenna is lazy 'laying'H or quad, dipole, slope..

I appreciate verymuch any suggestion, input from all, regarding the best
wire antenna for this site to be used in the 160M, 80M and 40M band.





Thankyou very much indeed in advance.



Regards,

Nuradi, YB0UNC / KU2B

Cellulair +62811138378



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