For those looking for high performance small cables - RG-400 cannot be
beat - it is expensive.
Double shields means high isolation from noise sources in the shack and
from other stations (SO2R).
The Teflon dielectric means the cables can handle legal limit power with
ease and higher than 30 MHz.
Every shack jumper - for 11 stations - at K3LR - is RG-400 with Amphenol
831SP UHF silver male connectors.
Preassembled popular length RG400 jumpers are available from DX
Engineering. Silver soldered and high pot tested.
73
Tim K3LR
On 2018-03-15 10:35, N2TK, Tony 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
>> _______________________________________________
>>
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