1/4 Wavelength of D10?

#2
I used it to garot a previous partner who threatened to expose me
 

elovabloke

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#5
bibo_boy said:
Anyone know the number to work out 1/4 wave length using D10 cable?

Also, anyone had experiences using it?

Cheers
Common – you know long range comms is the RAC’s domain. :party: Ring Bovvy, they will be happy to help.

TAXI
 
#6
As a rule of thumb, 68, 67, or 69.

I am assumiong you are talking HF freqs??

If so..

FREQs AND ANTENNA LENGTHS.


FREQ. LENGTH FREQ. LENGTH. FREQ. LENGTH. 2 31.2 11 5.4 21 2.6
3 21 12 5 22 2.4
4 15.7 13 4.5 23 2.3
5 12.4 14 4.2 24 2.2
6 10.3 15 3.8 25 2.1
7 8.7 16 3.5 26 2
8 7.6 17 3.3 27 1.9
9 6.7 18 3.1 28 1.8
10 6 19 2.9 29 1.7
20 2.7 30 1.6



Now why the fek does that look one way when I write it and a ball of bollarks when I post it???
 
#7
velocity = frequency x wavelength

so 1/4 wavelength = speed of light / frequency / 4

= 300000000 / (something between 20000000 and 100000000) / 4

So start at 3.25m and cut off 100mm at a time until you get a good reception. If your antenna is less than 750mm long, you've gone too far and will have to start again.
 
#8
bibo_boy said:
Anyone know the number to work out 1/4 wave length using D10 cable?

Also, anyone had experiences using it?

Cheers
Surely that is the wrong way of looking at it?

D10 cable is just that - a cable! It can be turned into an aerial and tuned to a frequency with the simplest of tools - a wirecutter!

What frequency do you want to send/receive? Then use the calculation:

Wavelength (m) = speed of light(m/s)/frequency (Hz)

As a part-time geek, I always check that I have the correct formula by using Radio 4 which transmits on 1500m Long Wave at 200KHz:

Lambda = 300,000,000/200,000

which in this case = 1500m.

Insert your own frequency and divide the result by 4.

Litotes
 
#11
Litotes said:
bibo_boy said:
Anyone know the number to work out 1/4 wave length using D10 cable?

Also, anyone had experiences using it?

Cheers
Surely that is the wrong way of looking at it?

D10 cable is just that - a cable! It can be turned into an aerial and tuned to a frequency with the simplest of tools - a wirecutter!

What frequency do you want to send/receive? Then use the calculation:

Wavelength (m) = speed of light(m/s)/frequency (Hz)

As a part-time geek, I always check that I have the correct formula by using Radio 4 which transmits on 1500m Long Wave at 200KHz:

Lambda = 300,000,000/200,000

which in this case = 1500m.

Insert your own frequency and divide the result by 4.

Litotes
Fcuk me! You must have a bloody big mast.
 
#12
Do you connect both elements (halves/side) of the D10 or only one? Also do you connect the steel and the copper or just the copper? So many questions... :twisted: Oh and can you use quad, if so whats the calculation?
 
#13
WhiteHorse said:
Do you connect both elements (halves/side) of the D10 or only one? Also do you connect the steel and the copper or just the copper? So many questions... :twisted: Oh and can you use quad, if so whats the calculation?
Is that a wah, coz I'm tempted to answer. DI0 - 4 copper wires for conductivity and 3 steel for strength.
 
#14
polar said:
WhiteHorse said:
Do you connect both elements (halves/side) of the D10 or only one? Also do you connect the steel and the copper or just the copper? So many questions... :twisted: Oh and can you use quad, if so whats the calculation?
Is that a wah, coz I'm tempted to answer. DI0 - 4 copper wires for conductivity and 3 steel for strength.
Curious. What you describe sounds like D7 - a seven strand cable used in WW2. D10 was a post war development having ten strands for reduced resistance and better resilience, though extensive war stocks of D7 continued to be used at least into the 1980's and were (erroneously) referred to as D10.

Are we still using 60 year old cable or has the specification changed?
Or was I wahed all those years ago?
 
#15
polar said:
WhiteHorse said:
Do you connect both elements (halves/side) of the D10 or only one? Also do you connect the steel and the copper or just the copper? So many questions... :twisted: Oh and can you use quad, if so whats the calculation?
Is that a wah, coz I'm tempted to answer. DI0 - 4 copper wires for conductivity and 3 steel for strength.

Surely the 3 steel strands are for forming a cross-shaped framework on top of the old MKI kero heater in order to produce the finest 'Toast a la Line Bedford'?
 
#16
polar said:
WhiteHorse said:
Do you connect both elements (halves/side) of the D10 or only one? Also do you connect the steel and the copper or just the copper? So many questions... :twisted: Oh and can you use quad, if so whats the calculation?
Is that a wah, coz I'm tempted to answer. DI0 - 4 copper wires for conductivity and 3 steel for strength.
Slightly.. One question I'v never had answered is wether you use both parts of the D10 or just one leg/half of the twisted pair? As Roadster280 states, R4 is the stuff, but like rocking horse to get hold of, so my question again..D10 one half or both?
 
#17
putteesinmyhands said:
polar said:
WhiteHorse said:
Do you connect both elements (halves/side) of the D10 or only one? Also do you connect the steel and the copper or just the copper? So many questions... :twisted: Oh and can you use quad, if so whats the calculation?
Is that a wah, coz I'm tempted to answer. DI0 - 4 copper wires for conductivity and 3 steel for strength.
Curious. What you describe sounds like D7 - a seven strand cable used in WW2. D10 was a post war development having ten strands for reduced resistance and better resilience, though extensive war stocks of D7 continued to be used at least into the 1980's and were (erroneously) referred to as D10.

Are we still using 60 year old cable or has the specification changed?
Or was I wahed all those years ago?
Bugger 8O , well last week it had seven strands 4 copper and 3 steel then again considering the FFR is 15 years old the cable could be 60!
 
#18
WhiteHorse said:
rocking horse to get hold of, so my question again..D10 one half or both?
Used to use both wires (I think - many moons ago), was told it was better than braid (as it didn't have a coil on the end of it).
 
#19
what ever length you finally calculate always shave 5% off, its easier for the surf and or turf to electronically lengthen the cable thus making it a little more efficient.
 
#20
Black and Brown is far better than the old Clansman braid or D10. R7 is the utlimate for base antennas, however a twat to work with and goes rusty v quickly.
 
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