10MHz Distibution boards (VK3XDK)
10MHz Distibution boards (VK3XDK)
Gday everyone,
My 10Mhz Distribution boards are now available
In some situations these boards can provided remarkable improvements!
10Mhz systems are often neglected due to "more important microwave stuff", unfortunately if a 10MHz reference is not clean it will greatly affect all of the associated equipment (especially PLL systems)
10MHz "ground loops", harmonics and feedback from other equipment can cause all sorts of issues! (This board can "Work Magic" on some systems )
Available, price is AUS$65 (and typically $7 postage within VK (padded box))
If interested please correspond by email, (to ease up the logger. ) (it also makes it easier for me to keep track of )
grumss@yahoo.com.au
My 10Mhz Distribution boards are now available
In some situations these boards can provided remarkable improvements!
10Mhz systems are often neglected due to "more important microwave stuff", unfortunately if a 10MHz reference is not clean it will greatly affect all of the associated equipment (especially PLL systems)
10MHz "ground loops", harmonics and feedback from other equipment can cause all sorts of issues! (This board can "Work Magic" on some systems )
Available, price is AUS$65 (and typically $7 postage within VK (padded box))
If interested please correspond by email, (to ease up the logger. ) (it also makes it easier for me to keep track of )
grumss@yahoo.com.au
- Attachments
-
- 10MHz Distribution.pdf
- (266.55 KiB) Downloaded 348 times
Last edited by VK3XDK on Sun Aug 18, 2013 2:01 pm, edited 1 time in total.
Re: 10MHz Distibution boards (VK3XDK)
Graham,VK3XDK wrote:...
I looked at the PDF, but I did not find input Z.
Is it Hiz or 50+j0?
If it is 50+j0, I will take one as I think will address the issues discussed at http://vk1od.net/module/PllLdr/RefTerm.htm.
Thanks... Owen
Last edited by VK2OMD on Sat Aug 17, 2013 9:57 am, edited 1 time in total.
Re: 10MHz Distibution boards (VK3XDK)
Gday Owen,
Yes it is a 50R (50ohm) input, I probably should of mentioned it somewhere
Yes it is a 50R (50ohm) input, I probably should of mentioned it somewhere
Re: 10MHz Distibution boards (VK3XDK)
I'll grab one please.
Rick Kowalewski
-- Perth, WA, 6530 -- OF77xw --
VK6RK
-- Perth, WA, 6530 -- OF77xw --
VK6RK
Re: 10MHz Distibution boards (VK3XDK)
Email has been sent. I would like one as well Graham.
Thanks.
Thanks.
Re: 10MHz Distibution boards (VK3XDK)
Looks like I am going to be busy!
could those interested please correspond by email (to ease the logger) (it is also a lot easier for me to keep track of the orders)
grumss@yahoo.com.au
could those interested please correspond by email (to ease the logger) (it is also a lot easier for me to keep track of the orders)
grumss@yahoo.com.au
Re: 10MHz Distibution boards (VK3XDK)
Graham was displaying these at GippsTech 2013, and they look really neat.
BNCs poke through the rear (or front!) panel very easily for distribution.
Two more pictures. (Have been meaning to get these GippsTech images to Graham for his own use).
BNCs poke through the rear (or front!) panel very easily for distribution.
Two more pictures. (Have been meaning to get these GippsTech images to Graham for his own use).
Adam, Brisbane
vk4ghz.com
VK4GHZ on Youtube
VK4GHZ on Odysee
10 things that happen when you stop checking Facebook constantly: http://tiny.cc/t5h7cz
How to quit Facebook: https://www.consumerreports.org/social- ... -facebook/
vk4ghz.com
VK4GHZ on Youtube
VK4GHZ on Odysee
10 things that happen when you stop checking Facebook constantly: http://tiny.cc/t5h7cz
How to quit Facebook: https://www.consumerreports.org/social- ... -facebook/
- VK5PJ
- Forum Diehard
- Posts: 708
- Joined: Sat Apr 02, 2005 7:38 pm
- Location: Barossa Valley S.A
- Contact:
Re: 10MHz Distibution boards (VK3XDK)
Hi Graeme
From your measurements, Will the output level from an output port be too high to drive a down stream 4 port input?
Regards,
Peter, vk5pj
Yes this will be a nice adjunct to any GPS or oven standard in a shack, had you considered any options for chaining them in series? In my case, I have a test bench with a Thunderbolt with a few bits of test gear that can take an ext 10MHz but now over the other side of the room I have an IC-910 with an xref in it that needs 10MHz, which is soon to be followed by a agile PLL for a microwave band. It would be good to be able to have 4 or 8 ports at the test bench (paralleled inputs as you described) and 4 ports another 5 metres away via a single feed.VK3XDK wrote:Looks like I am going to be busy!
could those interested please correspond by email (to ease the logger) (it is also a lot easier for me to keep track of the orders)
grumss@yahoo.com.au
From your measurements, Will the output level from an output port be too high to drive a down stream 4 port input?
Regards,
Peter, vk5pj
Re: 10MHz Distibution boards (VK3XDK)
Hi peter,
The input section is a 50R (1206) load resistor followed by a 10K trimmer (parallel) , these should be fine up to about 250mW (24dbm)
It is just a case of adjusting the trimmer to suit the input level (and required output level) of each board in the chain.
If the boards are connected in series, (ie output of one to input of another) there is likely to be no adjustment in the second board needed.
The input attenuator has been pre-set so that 10dbm IN produces 10dbm OUT. (the boards 8db (or so) of amplification has been nulled by the attenuator)
The input section is a 50R (1206) load resistor followed by a 10K trimmer (parallel) , these should be fine up to about 250mW (24dbm)
It is just a case of adjusting the trimmer to suit the input level (and required output level) of each board in the chain.
If the boards are connected in series, (ie output of one to input of another) there is likely to be no adjustment in the second board needed.
The input attenuator has been pre-set so that 10dbm IN produces 10dbm OUT. (the boards 8db (or so) of amplification has been nulled by the attenuator)
Last edited by VK3XDK on Mon Aug 19, 2013 8:01 am, edited 2 times in total.
Re: 10MHz Distibution boards (VK3XDK)
Here is a quick schematic of the input section of the board.
It can be compared to a volume control on a music amplifier, it can be turned down to zero if needed.
It can be compared to a volume control on a music amplifier, it can be turned down to zero if needed.
Re: 10MHz Distibution boards (VK3XDK)
Graham,VK3XDK wrote:Here is a quick schematic of the input section of the board.
It can be compared to a volume control on a music amplifier, it can be turned down to zero if needed.
It seems to me that where one wanted 8 or 12 output ports, two or three boards could be stacked vertically, the input term R removed from all but one, and the inputs paralleled with a vertical header or real short wires.
Owen
Re: 10MHz Distibution boards (VK3XDK)
Yes exactly right Owen.
although at low impedance (50R) i think that 10Mhz is fairly forgiving with "input leads"
although at low impedance (50R) i think that 10Mhz is fairly forgiving with "input leads"
Re: 10MHz Distibution boards (VK3XDK)
Did everyone who sent an email get a reply?
sometimes (often) emails get blocked by spam filters
trick is to check spam folders frequently
sometimes (often) emails get blocked by spam filters
trick is to check spam folders frequently
Re: 10MHz Distibution boards (VK3XDK)
Gday everyone,
The original lot sold-out very quickly (within a week!)
I have now got more available, price remains at $65 plus postage
Please email if interested (grumss@yahoo.com.au)
The original lot sold-out very quickly (within a week!)
I have now got more available, price remains at $65 plus postage
Please email if interested (grumss@yahoo.com.au)