Cushcraft R5/R7 Matching Network (MN-7) Rebuild
gb
vertical -- by --G0WCW
http://www.mrs.bt.co.uk/mrs/r5/
Nice work!
http://www.mrs.bt.co.uk/mrs/r5/DSCN2478.JPG
Enclosure
The box is from maplin, product number YM91Y and is one of their 'IP
enclosure' range. The box is 150 x 110 x 70mm in size (product codes YM91Y -
grey, YM93B - grey with clear lid). Cost is around six UK pounds.
It is physically the same size as the Cushcraft variant, but the PCB has
to be slightly 'nibbled' at the corners to get it to fit inside the newer
box. I'd say the original Cushcraft enclosure isn't that good as they used
steel screws into brass fixings. The screws rust over and then shear off. In
my view, the Maplin IP enclosure is a better solution to outdoor use (IP56
rated).
Jimmie D
"gb" <w9nog...@arrlspamno.net> wrote in message
news:z6mdnZ68Aay0qLja...@comcast.com...
Anyone have a schematic of the matching network. I have two antennas and
both are missing the box.
Jimmie
The Shadow
"Jimmie D" <GFE...@carolina.rr.com> wrote in message
news:4725df04$0$19635$4c36...@roadrunner.com...
See URL:
http://www.pa0fri.geerligs.com/
Click on ANT, then green dot next to Cushcraft R5, maintenance and repair
Lamont - The Shadow Knows
Jimmie D
"The Shadow" <Cran...@CobaltClub.com> wrote in message
news:j3mVi.35200$bL7....@newsfe09.phx...
Just what I needed, I had bought two antennas at the Shelby hamfest getting
them mostly for tubing and hardware. I may be able to get them on the air.
The fiberglass insulators on mine are shot, Im not sure how I will repair
them. Im thikinking about cutting back the rotten part and then building it
back up with glass cloth and resin.
Jimmie
Jimmie
Jim-NN7K
http://www.iol.ie/~bravo/r7_vertical.htm
And think should act the same, electrically, Jim NN7K
Jim-NN7K
Also, for repair of the traps them selfs, check out
http://www.telusplanet.net/public/telwest/R7/cushcraft_trap.htm
gb
>>>
>>> Anyone have a schematic of the matching network. I have two antennas and
>>> both are missing the box.
>>>
>>>
>>> Jimmie
>>
>> See URL:
>> http://www.pa0fri.geerligs.com/
>>
>> Click on ANT, then green dot next to Cushcraft R5, maintenance and repair
>>
>
> getting them mostly for tubing and hardware. I may be able to get them on
> the air. The fiberglass insulators on mine are shot, Im not sure how I
> will repair them. Im thikinking about cutting back the rotten part and
> then building it back up with glass cloth and resin.
>
> Jimmie
>
With the web sites below -- you can build a new R5/R7.
Check A0FRI web page for recommendations on insulator repair.
You could also contact Tom, A9KW at ZeroFive antennas --- IF uses oil filled
nylon
for his vertical insulators
http://www.zerofive-antennas.com/
R5/R7 Matching Unit rebuild by G0WCW (photos and parts list)
http://www.mrs.bt.co.uk/mrs/r5/
R5/R7 vertical maintenance by John Tait, EI7BA
http://www.qsl.net/ei7ba/r7_vertical.htm
R5/R7 Coaxial Capacitor Trap repair by VE6LB
http://www.telusplanet.net/public/telwest/R7/cushcraft_trap.htm
R5/R7 Repair and Maintenance by A0FRI
http://www.xs4all.nl/~pa0fri/Ant/R5/onhr5eng.htm
Troubleshooting Cushcraft vertical traps (Ed Hammond)
http://www.iol.ie/~bravo/Troubleshooting%20Traps.htm
gb
gregor...@comcast.net
> "Jimmie D" <GFEN...@carolina.rr.com> wrote in message
>
> news:47263410$0$28831$4c36...@roadrunner.com...
>>
> >>> Anyone have a schematic of the matching network. I have two antennas and
> >>> both are missing the box.
>
> >>> Jimmie
>
Jimmie -
Contact me, my callsign AT arrl.net (or -- at QRZ Q&A)
I am rebuilding two Cushcraft R7 presently and just finished a
Cushcraft R5 --
I will have the vendor sources, part numbers, parts sources, etc.
to get both of those antenna fully operaitonal again.
Greg
W9GB