[TowerTalk] Skinny QRO coax jumpers for station interconnection

[Keith Dutson]

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 at contesting.com> On Behalf Of N2TK, Tony
Sent: Thursday, March 15, 2018 7:40 AM
To: 'Paul Christensen' <w9ac at arrl.net>; 'towertalk reflector'
<towertalk at 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 at contesting.com] On Behalf Of Paul
Christensen
Sent: Thursday, March 15, 2018 8:12 AM
To: 'towertalk reflector' <towertalk at 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 at contesting.com> On Behalf Of Grant
Saviers
Sent: Thursday, March 15, 2018 1:23 AM
To: Jim Smith <jimsmith at shaw.ca>; towertalk at 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
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