Almost everything about the argument is frequency dependant. I do a lot of
work at 800 mHz. Often I will combine six or seven 100 watt transmitters to
a single antenna with combiner cavities and circulators. N Connectors will
often fail if all the base stations come up at the same time. When working
at .5 KW and above at 800 mHz or higher, I would not consider N or PL259.
There can be some weakness of both PL259 and N at HF. I switched to one of
the 75 meter arrays (involved 807s) once while running war emergency power
on 20 meters and blew a PL259 off the cable and started a small plastic
fire. The Henry Radio 4k Ultra amp uses a special "high power" N looking
connector on the back of the amp that is very different and not compatible
with standard. I think the price for a single connector is in the $150
range.
Things can go very wrong when even a small mistake occurs at high power. You
cannot switch off-line fast enough to avoid these often violent failures.
Sam N9FUT
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Shane Youhouse
Sent: Monday, April 25, 2011 7:25 PM
To: Carl; Roger (sub1); amps@contesting.com
Subject: Re: [Amps] DIN vs N
PL 259s I've personally witness run at 2Kw carrier, 10 Kw pep.
N's AND BNC's I've seen about 5-6 kw carrier, 100 percent modulated.
LC I've seen go to about 55Kw, modulated.
I've seen the DIN go in the neighborhood of 140Kw input (linear amp, NOT
plate mod xmitter). Estimates put the carrier at around 80.
Putting ANY vswr on these connectors REALLY degrade them. ALSO, I've found
MAKE SURE you don't put the connector where it will be in an installation
where current can soar. Believe it or not, the N and BNC are the WORST for
multiband. I've seen more of them meltdown than I have PL connectors on
multi-band, tuna fed antennas. LOTS more surface area on a PL 259 than a N
or BNC.... Means more current carrying at low freqs and more area for skin
effect at higher freq's. The downside is they are NOT impedance constant,
and the quality REALLY varies on PL \ SO connectors.
Anywho, my unprofessional take on hi power and connections. Feeding yagi's
gets tricky, too.
--Shane
Kilowatt Delta Six Victor Xray India
-----Original Message-----
From: Carl <km1h@jeremy.mv.com>
Sent: Monday, April 25, 2011 03:22 PM
To: Roger (sub1) <sub1@rogerhalstead.com>; amps@contesting.com
Subject: Re: [Amps] DIN vs N
Ive run PL-259's at 5:1 VSWR for decades on 75/80 without a problem, no need
to run anything else at 6M and below.
Whats an antenna tuner, a different fish species(-;
Carl
KM1H
----- Original Message -----
From: "Roger (sub1)" <sub1@rogerhalstead.com>
To: <amps@contesting.com>
Sent: Monday, April 25, 2011 6:00 PM
Subject: Re: [Amps] DIN vs N
> On 4/24/2011 8:39 AM, Carl wrote:
>> ----- Original Message -----
>> From:<donroden@hiwaay.net>
>> To:<amps@contesting.com>
>> Sent: Saturday, April 23, 2011 10:43 PM
>> Subject: [Amps] DIN vs N
>>
>>
>>> DIN connectors vs Type N .......
>>>
>>> Is there a larger cable that mates with the DIN connector ?
>> They mate with the same hardline and the RG-213 and larger soft cables
>> cables as an N.
>>
>>
>>> What's the advantage / disadvantages of the DIN ?
>> At HF, zero. An N and RG-213 will handle many times the legal limit. The
>> DIN
>> is popular with the 20-40KW and up CB crowd and the hams running that
>> level.
>
> Maybe if you don't try to cover all of 75 or 160, but I've blown out N
> connectors (Amphenols no less) running no more than the legal limit on
> 75 a number of times. I use a tuner so I can cover all of both bands and
> have not had good luck with N connectors on either of those two bands.
> On 40 I not only can use N connectors, but RG8X, and CNT240 at the legal
> limit.
>
>> At high VHF and UHF the connector is the weak link so a DIN can run
>> cool in
>> a 1500W + 432 EME amp running data modes. I run N at 1500W on 2M and they
>> run cool as long as its a quality USA brand. They run decidedly warm at
>> that
>> level on 222.
>>
>> I havent dared run my big 432 amp close to that level yet until all the
>> feed
>> line and antenna connectors are upgraded.
>
> Not a problem here. The legal limit on 440 is 50 watts.<:-((
>
> 73
>
> Roger (K8RI)
>
>> Carl
>> KM1H
>>
>>
>>
>>>
>>> Don W4DNR
>>>
>>>
>>> _______________________________________________
>>> Amps mailing list
>>> Amps@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/amps
>> _______________________________________________
>> Amps mailing list
>> Amps@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>
>
>
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|