Re: [Repeater-Builder] desnse on community sites

2006-03-30 Thread Jay Urish 
hey Brett,
Please do us a favor and adjust your email client so it doesn't send 
email in HTML.

HTML has no place in an email.. The font was so small I needed a 
magnifying glass to read it and I have 20/20 vision.


Brett wrote:
> Have you tried common earthing of the feeders?
> Do the radios have good shielding between them (metal cases no plastic).
> Have you looked at the site with a good specan?
> Is the sound you are hearing antenna flutter?
> 80 MHz Cols what brand are they?
> We found over here in the west we replaced cols with 4 stack dipoles 
> because of flutter and bad joints internally.
> I really think it is time to check with a good Spectrum Analyser. You 
> may be surprised what you see coming done the feeders from the other txers.
> Make sure you look at the rx freqs when they are all in rx only, you may 
> well find that you have a sprogy rxer basically txing into you other rxers.
> Cheers
> Brett
>  
> 
> - Original Message -
> *From:* Ian Wells 
> *To:* Repeater-Builder@yahoogroups.com
> 
> *Sent:* Thursday, March 30, 2006 6:33 AM
> *Subject:* [Repeater-Builder] desnse on community sites
> 
>  Hi guys .I have a small problem that i have been trying to sort out
> for a while now .I have 5 repeaters operating on one of my sites
> 3 vhf low band and 2 uhf band.The frequencies are as follows
> VHF
> A-TX 70.300MHZ RX 72.800MHZ   fitted with 4 1.5 meter  by 4 inch
> meter tins-most likely a notch diplexer3db colinear ant   FM828E
> B-TX 70.5875MHZ RX 73.0875MHZ   fitted with 4 1.5 meter by 4 inch
> meter tins-most likely a notch diplexer3db colinear  ant   FM828E
> C-TX 70.725MHZ RX 73.225MHZ  fitted with a new band pass/band
> reject possibly a varinotch 3db colinear antFM828E
> UHF
> D- TX 473.575 RX 478.775MHZ fitted with mobile notch
> diplexer 6mc450s  6db colinear ant   MAXON PM150/SM4450SC
> E- TX 489.1MHZ RX 483.900MHZ  fitted with 6ld450s diplexer 6db
> colinear ant MAXON PM150/SM4450SC
>  
> All coaxes are Heliax from antennas to Diplexers with N connectors
> Interconnecting cables between diplexers and radios  are rg223u
> A and B are a 1.5 meter apart with C in the middle
> All antennas are mounted  aprox 50 cms or more away from C or each
> other .
> D and E  have a 1.5 meter between them
> ie-   D
>  
>  AC   B
>  
> E
>  
> I am at times having desense (ie scratch ) especially in windy
> weather occuring on repeaters B and D.It doesn't seem to affect the
> desense wether the transmitters are txing or not .There isnt any
> problem of the repeaters affecting each other ,they all work great
> just the problem of scratch coming and going .A,C and E do get
> scratch on occasion but no where as bad as D and B.D and B works
> great sometimes (clear with no scratch)and then reception
> will slowly develope major scratch and then slowly clear up
> -possibly electrostatic or wind moving the antennas ?.I have been
> fixing loose  bolts on the windmill tower to stop problems incase of
> tower twist and this affecting service.I am wondering if there are
> any futher sugestions . 
> Thank You,
> Ian Wells,
> Kerinvale Comaudio,
> www.kerinvalecomaudio.com.au 
>  
>   
> 
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-- 
Jay Urish W5GM
ARRL Life MemberDenton County ARRL VEC
TXFCA President N5ERS VP/Trustee
DCARA President Denton County ARES AEC

Monitoring 444.850 PL-88.5 146.92 PL-110.9




 
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Re: [Repeater-Builder] desnse on community sites

2006-03-30 Thread Ian Wells 








 
 
 
Have you tried common earthing of the feeders? About to set them up
Do the radios have good shielding between them (metal cases no plastic).All metal case radios
Have you looked at the site with a good specan? Will look into it
Is the sound you are hearing antenna flutter?
80 MHz Cols what brand are they? Antenna Agencies and RFI
We found over here in the west we replaced cols with 4 stack dipoles because of flutter and bad joints internally.
Space doesn't permit stacked dipoles
I really think it is time to check with a good Spectrum Analyser. You may be surprised what you see coming done the feeders from the other txers.
Make sure you look at the rx freqs when they are all in rx only, you may well find that you have a sprogy rxer basically txing into you other rxers. Will check
Cheers
Brett
 

- Original Message - 
From: Ian Wells 
To: Repeater-Builder@yahoogroups.com 
Sent: Thursday, March 30, 2006 6:33 AM
Subject: [Repeater-Builder] desnse on community sites





 Hi guys .I have a small problem that i have been trying to sort out for a while now .I have 5 repeaters operating on one of my sites 
3 vhf low band and 2 uhf band.The frequencies are as follows
VHF 
A-TX 70.300MHZ RX 72.800MHZ   fitted with 4 1.5 meter  by 4 inch meter tins-most likely a notch diplexer    3db colinear ant   FM828E
B-TX 70.5875MHZ RX 73.0875MHZ   fitted with 4 1.5 meter by 4 inch meter tins-most likely a notch diplexer3db colinear  ant   FM828E
C-TX 70.725MHZ RX 73.225MHZ  fitted with a new band pass/band reject possibly a varinotch 3db colinear ant    FM828E
UHF
D- TX 473.575 RX 478.775MHZ fitted with mobile notch diplexer 6mc450s  6db colinear ant   MAXON PM150/SM4450SC
E- TX 489.1MHZ RX 483.900MHZ  fitted with 6ld450s diplexer 6db colinear ant MAXON PM150/SM4450SC
 
All coaxes are Heliax from antennas to Diplexers with N connectors
Interconnecting cables between diplexers and radios  are rg223u
A and B are a 1.5 meter apart with C in the middle
All antennas are mounted  aprox 50 cms or more away from C or each other .
D and E  have a 1.5 meter between them 
ie-   D
 
 A    C   B
 
E
 
I am at times having desense (ie scratch ) especially in windy weather occuring on repeaters B and D.It doesn't seem to affect the desense wether the transmitters are txing or not .There isnt any problem of the repeaters affecting each other ,they all work great just the problem of scratch coming and going .A,C and E do get scratch on occasion but no where as bad as D and B.D and B works great sometimes (clear with no scratch)and then reception will slowly develope major scratch and then slowly clear up -possibly electrostatic or wind moving the antennas ?.I have been fixing loose  bolts on the windmill tower to stop problems incase of tower twist and this affecting service.I am wondering if there are any futher sugestions . 

Thank You,
Ian Wells,
Kerinvale Comaudio,
www.kerinvalecomaudio.com.au
 








 





















  




  
  
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Re: [Repeater-Builder] desnse on community sites

2006-03-30 Thread Brett 





Have you tried common earthing of the feeders?
Do the radios have good shielding between them (metal cases no 
plastic).
Have you looked at the site with a good specan?
Is the sound you are hearing antenna flutter?
80 MHz Cols what brand are they?
We found over here in the west we replaced cols with 4 stack 
dipoles because of flutter and bad joints internally.
I really think it is time to check with a good Spectrum 
Analyser. You may be surprised what you see coming done the feeders from the 
other txers.
Make sure you look at the rx freqs when they are all in rx 
only, you may well find that you have a sprogy rxer basically txing into you 
other rxers.
Cheers
Brett
 

  - Original Message - 
  From: 
  Ian Wells 
  
  To: Repeater-Builder@yahoogroups.com 
  
  Sent: Thursday, March 30, 2006 6:33 
  AM
  Subject: [Repeater-Builder] desnse on 
  community sites
  
  

  
 Hi guys .I have a small problem that i have been trying to 
sort out for a while now .I have 5 repeaters operating on one of my 
sites 
3 vhf low band and 2 uhf band.The frequencies are as follows
VHF 
A-TX 70.300MHZ RX 72.800MHZ   
fitted with 4 1.5 meter  by 4 inch meter tins-most likely a notch 
diplexer    3db colinear ant   FM828E
B-TX 70.5875MHZ RX 73.0875MHZ   fitted with 4 1.5 meter 
by 4 inch meter tins-most likely a notch 
diplexer3db colinear  ant   
FM828E
C-TX 70.725MHZ RX 73.225MHZ  fitted 
with a new band pass/band reject possibly a 
varinotch 3db colinear ant    
FM828E
UHF
D- TX 473.575 RX 
478.775MHZ fitted with 
mobile notch diplexer 6mc450s  6db colinear ant   MAXON 
PM150/SM4450SC
E- TX 489.1MHZ RX 483.900MHZ  fitted 
with 6ld450s diplexer 6db colinear ant MAXON 
PM150/SM4450SC
 
All coaxes are Heliax from antennas to Diplexers with N 
connectors
Interconnecting cables between diplexers and radios  are 
rg223u
A and B are a 1.5 meter apart with C in the middle
All antennas are mounted  aprox 50 cms or more away from C or 
each other .
D and E  have a 1.5 meter between them 
ie-   
D
 
 A    
C   B
 
E
 
I am at times having desense (ie scratch ) especially in windy 
weather occuring on repeaters B and D.It doesn't seem to affect the 
desense wether the transmitters are txing or not .There isnt any problem 
of the repeaters affecting each other ,they all work great just the 
problem of scratch coming and going .A,C and E do get scratch on 
occasion but no where as bad as D and B.D and B works great 
sometimes (clear with no scratch)and then reception 
will slowly develope major scratch and then slowly clear up 
-possibly electrostatic or wind moving the antennas ?.I have been 
fixing loose  bolts on the windmill tower to stop problems incase 
of tower twist and this affecting service.I am wondering if there are 
any futher sugestions . 

Thank You,
Ian Wells,
Kerinvale Comaudio,
www.kerinvalecomaudio.com.au
 

  

  
  


 
  













  




  
  
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