Towertalk
[Top] [All Lists]

Re: [TowerTalk] Skinny QRO coax jumpers for station interconnection

To: "Tower Talk" <towertalk@contesting.com>
Subject: Re: [TowerTalk] Skinny QRO coax jumpers for station interconnection
From: "Don W7WLL" <w7wll@arrl.net>
Date: Thu, 15 Mar 2018 20:36:01 -0700
List-post: <mailto:towertalk@contesting.com>
Agree with Terry, MPD has been a valuable source and delivers top quality at a reasonable price. They recently did some SMA cables for my ADS-B setup.

Don W7WLL

-----Original Message----- From: terry burge
Sent: Thursday, March 15, 2018 7:10 PM
To: Tower Talk
Subject: Re: [TowerTalk] Skinny QRO coax jumpers for station interconnection

Hello fellow DX travelers,

FWIW my experience with RG-8X has taught me not to use it much. I tried building jumpers as well as buying some like you find for sale at ham fest. But it seemed that half the time they developed shorts and opens, or at least center to shield shorts. I pretty much gave up on them and now buy the short jumpers I need from MPD Digital off ebay. They can build them much better than I ever had much success at and really put out a great variety. The RG-400 I'm not familiar with but think it is like the stuff I seen from one or two of the Waller Flag U-tube videos. Looked very much like stuff you would expect to see with VHF/UHF equipment and/or expensive test lab equipment.

Terry
KI7M

On March 15, 2018 at 7:35 AM "N2TK, Tony" <tony.kaz@verizon.net> wrote:


Keith,
Tnx for info. Only interested n 160-6M here. I need to make up some jumpers. I have RG8X low loss cable already. Trying to find out if any reason to buy some RG400 instead. Most of the jumpers will be only a couple feet. But I do
need a 12' one too.
73,
N2TK, Tony

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of Keith
Dutson
Sent: Thursday, March 15, 2018 9:57 AM
To: Tower Talk <towertalk@contesting.com>
Subject: Re: [TowerTalk] Skinny QRO coax jumpers for station interconnection

The key word here is QRO.  RG-8X can handle up to 1000 watts, but suffers
some heat loss at 1500 watts, mostly for 100 percent duty-cycle digital
modes like RTTY.

High dollar, double shielded skinny cables like RG-400 are used primarily
for VHF/UHF repeater cabling to the duplexer, where signal bleeding between
receiver and transmitter will cause de-sensing (range reduction).  Foil
shielding does not seem to provide the same shielding as double, silver
plated braid.

73, Keith NM5G

-----Original Message-----
From: TowerTalk <towertalk-bounces@contesting.com> On Behalf Of N2TK, Tony
Sent: Thursday, March 15, 2018 7:40 AM
To: 'Paul Christensen' <w9ac@arrl.net>; 'towertalk reflector'
<towertalk@contesting.com>
Subject: Re: [TowerTalk] Skinny QRO coax jumpers for station interconnection

For jumpers in the shack what about RG-8X low loss with foil and braid
shield that Davis RF lists? How does it compare to RG-400? The most power
these jumpers would see is 100W. I use Buryflex from the output of the amps
which are in the basement.
N2TK, Tony

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of Paul
Christensen
Sent: Thursday, March 15, 2018 8:12 AM
To: 'towertalk reflector' <towertalk@contesting.com>
Subject: Re: [TowerTalk] Skinny QRO coax jumpers for station interconnection

For those wanting to crimp connectors on RG400, I've been using these two
types from RF Industries:

PL-259:  RFU-505-C1
Male N:  RFN-1005-3C1

For soldering RG400 with a male PL-259, a UG reducer is needed. The RG400's
silver shield easily bonds to a silver-plated reducer.

Rarely do I recommend alternative installation practices beyond what
connector manufacturers specify, but I recommend this method above all
others.   Do just one and it will be addictive.

http://www.n3sh.org/PL259.pdf

Paul, W9AC





-----Original Message-----
From: TowerTalk <towertalk-bounces@contesting.com> On Behalf Of Grant
Saviers
Sent: Thursday, March 15, 2018 1:23 AM
To: Jim Smith <jimsmith@shaw.ca>; towertalk@contesting.com
Subject: Re: [TowerTalk] Skinny QRO coax jumpers for station interconnection

RG142 will handle the power but the center conductor is silver plate on
copper clad solid steel (SCCS). RG400 is a more flexible choice as it has a
stranded center, silver over copper, but given the double braid shield and
TFE insulation it is still stiffer than RG8X. I use soldered PL's since the
TFE is very heat resistant.

Or get them made to order, not bad prices considering what the raw cable
cost is per foot.

https://www.ebay.com/itm/6-10-RG400-M17-N-Male-Jumper-Silver-coated-RF-LAB-c
able-USA/131261896246?hash=item1e8fd19636:m:mxHmFuMTID-ASNC8GHWzR7w

i think they will put whatever connectors you want on each end.

Grant KZ1W

On 3/14/2018 21:44 PM, Jim Smith wrote:
> I have a number of filters and switches to wire up in my QRO station.
> I
would like the necessary coax jumpers to be thinner (0.25" ?) and more
flexible than, say, RG 213. They will be terminated by crimped PL 259s (or
equivalent).
>
> Any suggestions as to what I should use?
>
> 73, Jim VE7FO
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>

_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk

_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk

_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk

_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk

_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk


---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus


_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk

<Prev in Thread] Current Thread [Next in Thread>