DIAMOND D777 IN LOFT?

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DIAMOND D777 IN LOFT?

Postby waxmax » Sun Dec 30, 2018 12:19 pm

Hello,
after about a year of owning a uniden ubc 125 xlt scanner, I'm very pleased with the results and want even more. I've got a telescopic antenna and it picks up local airband frequencies very well, with full bars for manchester ATC when outside and within certain rooms in my house.
However, I'm now looking to get something better to put in my loft. The telescopic gets full bars for most frequencies in my loft and its not an specialised airband antenna either.
Will a diamond d777 greatly improve my signals? There is no large damaging terrain between me and the airport, and my cheap telescopic is doing extremely well, so can i expect a diamond d777 to pick up much more than it with stronger signals . , EG full bars on 128.050 instead of half for the controllers? ,and i can currently just about pick up barton controllers( very faint) with telescopic when in loft, is a d777 likely to improve this to a her-able signal? ( no terrain either to affect line of sight betwenn my location and barton)

Thankyou very much.
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Re: DIAMOND D777 IN LOFT?

Postby G4RMT » Sun Dec 30, 2018 2:13 pm

With low loss coax, I'd say it will be better, but your success with the telescopic means that from this to the source is a good path. Perhaps 180 degrees the other way is a mass of walls and clutter, so that way would be a problem that the loft antenna wouldn't suffer from - so topography and pure luck could be working for you, and tasing the antenna up a few feet to the loft might not make an earth shattering difference - but would give the same performance 360 degrees all around. For the price, it's certainly worth doing - just make sure you use decent feeder.
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Re: DIAMOND D777 IN LOFT?

Postby bones13 » Sun Dec 30, 2018 3:20 pm

Hi waxman I can’t offer any advise but I am in a similar situation to you. I have been using my 125 with a home made antenna in the loft with poor quality coax or the Watson 881. I have ordered a D777 and decent coax to go in the loft. I hope this will improve my mil air reception. From the north Suffolk coast I can hear mil flights on approach to the west of Mildenhall down to about 3000 feet but only air to ground comms. But aircraft tanking in AARA8 I can only hear faintly. I don’t think anyone can predict how much better it will be. It’s just a matter of trying to get the best out of the equipment as possible. Location and height are the governing factors me thinks.
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Re: DIAMOND D777 IN LOFT?

Postby waxmax » Sun Dec 30, 2018 3:21 pm

G4RMT wrote:With low loss coax, I'd say it will be better, but your success with the telescopic means that from this to the source is a good path. Perhaps 180 degrees the other way is a mass of walls and clutter, so that way would be a problem that the loft antenna wouldn't suffer from - so topography and pure luck could be working for you, and tasing the antenna up a few feet to the loft might not make an earth shattering difference - but would give the same performance 360 degrees all around. For the price, it's certainly worth doing - just make sure you use decent feeder.


Would rg8 mini coax be fine or rg58/rg-213 be better coax? I believe the d777 has an so-239 socket, so a pl-259 connector will be needed for coax to d777, then BNC connector for coax to ubc 125.
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Re: DIAMOND D777 IN LOFT?

Postby waxmax » Sun Dec 30, 2018 7:15 pm

bones13 wrote:Hi waxman I can’t offer any advise but I am in a similar situation to you. I have been using my 125 with a home made antenna in the loft with poor quality coax or the Watson 881. I have ordered a D777 and decent coax to go in the loft. I hope this will improve my mil air reception. From the north Suffolk coast I can hear mil flights on approach to the west of Mildenhall down to about 3000 feet but only air to ground comms. But aircraft tanking in AARA8 I can only hear faintly. I don’t think anyone can predict how much better it will be. It’s just a matter of trying to get the best out of the equipment as possible. Location and height are the governing factors me thinks.

You're definitely right here, just want a review really of the d777 from someone who has one.
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Re: DIAMOND D777 IN LOFT?

Postby Chris P » Mon Dec 31, 2018 1:10 am

steer clear of RG58 as it is very lossy at UHF and also be aware that there are various types of mini 8 some of which are no better than RG58 .


RG213 or better would be my advice re coax unless you can be sure of the quality of the mini 8.


My D777 is on the gable end of my house so I am unable to advise how it would perform in the loft but it is my antenna of preference for use on the airbands . I use a bowtie ( homebrew ) in the loft for other frequencies fed via good quality satellite cable which although 75ohm impedance it is designed for UHF and above and the low loss qualities more than outway the impedance mismatch( wideband antennas are never 50 ohm across their bandwidth anyway \) . Its also very much cheaper than the better quality coax required for transmitting purposes .
Regards Chris aka G8FFF nipper or tazmin88
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Re: DIAMOND D777 IN LOFT?

Postby waxmax » Mon Dec 31, 2018 9:52 am

Chris P wrote:steer clear of RG58 as it is very lossy at UHF and also be aware that there are various types of mini 8 some of which are no better than RG58 .


RG213 or better would be my advice re coax unless you can be sure of the quality of the mini 8.


My D777 is on the gable end of my house so I am unable to advise how it would perform in the loft but it is my antenna of preference for use on the airbands . I use a bowtie ( homebrew ) in the loft for other frequencies fed via good quality satellite cable which although 75ohm impedance it is designed for UHF and above and the low loss qualities more than outway the impedance mismatch( wideband antennas are never 50 ohm across their bandwidth anyway \) . Its also very much cheaper than the better quality coax required for transmitting purposes .


Hello, would this type of mini 8 be ok or quite detrimental
:
https://www.radioworld.co.uk/mini-rg8_m ... y=Rg%25208

Or can’t you tell.
I think rg 213 may be too thick and heavy you see, but if it helps then I’ll definitely go for it .
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Re: DIAMOND D777 IN LOFT?

Postby Chris P » Mon Dec 31, 2018 10:32 am

waxmax wrote:
Chris P wrote:steer clear of RG58 as it is very lossy at UHF and also be aware that there are various types of mini 8 some of which are no better than RG58 .


RG213 or better would be my advice re coax unless you can be sure of the quality of the mini 8.


My D777 is on the gable end of my house so I am unable to advise how it would perform in the loft but it is my antenna of preference for use on the airbands . I use a bowtie ( homebrew ) in the loft for other frequencies fed via good quality satellite cable which although 75ohm impedance it is designed for UHF and above and the low loss qualities more than outway the impedance mismatch( wideband antennas are never 50 ohm across their bandwidth anyway \) . Its also very much cheaper than the better quality coax required for transmitting purposes .


Hello, would this type of mini 8 be ok or quite detrimental
:
https://www.radioworld.co.uk/mini-rg8_m ... y=Rg%25208

Or can’t you tell.
I think rg 213 may be too thick and heavy you see, but if it helps then I’ll definitely go for it .





I would suggest that the mini 8 from Radioworld would definately be better than RG58 and as you say ,it is far more flexible than RG213
Regards Chris aka G8FFF nipper or tazmin88
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Re: DIAMOND D777 IN LOFT?

Postby waxmax » Mon Dec 31, 2018 1:25 pm

Chris P wrote:
waxmax wrote:
Chris P wrote:steer clear of RG58 as it is very lossy at UHF and also be aware that there are various types of mini 8 some of which are no better than RG58 .


RG213 or better would be my advice re coax unless you can be sure of the quality of the mini 8.


My D777 is on the gable end of my house so I am unable to advise how it would perform in the loft but it is my antenna of preference for use on the airbands . I use a bowtie ( homebrew ) in the loft for other frequencies fed via good quality satellite cable which although 75ohm impedance it is designed for UHF and above and the low loss qualities more than outway the impedance mismatch( wideband antennas are never 50 ohm across their bandwidth anyway \) . Its also very much cheaper than the better quality coax required for transmitting purposes .


Hello, would this type of mini 8 be ok or quite detrimental
:
https://www.radioworld.co.uk/mini-rg8_m ... y=Rg%25208

Or can’t you tell.
I think rg 213 may be too thick and heavy you see, but if it helps then I’ll definitely go for it .





I would suggest that the mini 8 from Radioworld would definately be better than RG58 and as you say ,it is far more flexible than RG213


Its extremely annoying, literally no store has the d777 in stock!
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Re: DIAMOND D777 IN LOFT?

Postby waxmax » Mon Dec 31, 2018 2:06 pm

Ive now changed my mind, does anyone know how these antennas will preform:

https://www.nevadaradio.co.uk/radio-sca ... er-b1300-n
https://www.nevadaradio.co.uk/avionics/ ... -airmaster
https://www.radioworld.co.uk/radioworld ... 520antenna

I'm very close to EGCC, so distance is not my issue. Anyone know how good the above are, are how much worse compared to d777?
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