[Amps] DIN vs N

Mon Apr 25 20:05:41 PDT 2011

Agreed on ALL parts.

Position of connector + (in regards to band, etc) can ALL wreak havoc w ANY connector.

The PL connector will eat ANY N \ BNC for lunch, with ANY reflected power below 10 meters.

You get that 10 bucks yet?  I've sent it twice.  First time was my screw up.  I BOUGHT first class stamps, of course, our socialist @-hole increased our postage before I mailed it....  Second time I threw in the mail during a move:  Never heard back, so I //assumed\\ you got it.

Transistors have ratings, tubes have guidelines!

--Shane  
Kilowatt Delta Six Victor Xray India

-----Original Message-----
From: Jim Thomson <jim.thom at telus.net>
Sent: Monday, April 25, 2011 07:47 PM
To: amps at contesting.com
Subject: [Amps] DIN vs N

Date: Mon, 25 Apr 2011 16:24:52 -0700
From: Shane Youhouse <kd6vxi at gmail.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

####  And this all depends on several factor's.....like FREQ, HUMIDITY, is Dow Corning DC-4 used...and what is the PEAK  V  across the connector itself.  Then toss in duty cycle, connector brand, install method,was silver solder used, etc, etc. 
##  4:1  swr, such that the peak current is sky high....but duty cycle is low enough.... probably no big deal on  the much bigger pin used on teflon/Silver  PL-259's   [ and assuming you also use the mating silver/teflon mating female] 

##  Now if the peak V is sky high....look out, the uhf connector's  will cut loose on you every time.   You hear this from the 11m ops all the time.    "1:1 swr, no problems..... 1.3:1  swr...and the connector will flash over"  
## Type N is rated at 500 V.      7-16 Din is rated for 2750-2900V.     There is No RF on the pin anyway!   Once plugged in, all the RF flows down the outside of the mating female.  You will see that the base of a type N..or 7-16 DIN is bigger OD than the pin itself..and in fact is the same OD as the mating female.   

###  a 7-16 din means the OD of the mating female is 7mm  [ .284"  which is huge] .     The 16mm  is the  ID  of the mating  outer conductor collet.  The OD of the pin, on a 7-16 DIN is a big mother... aprx the size of a 22 cal slug.  
##  16mm  - 7mm  = 9 mm.    9mm/2= 4.5mm     There is a 4.5mm air gap  between  OD of pin , and ID of outer conductor collet  on any din.    4.5mm air gap is good for aprx 2750-2900 v RMS.    Add  41%  for peak V.   
 The beauty of the 7-16 DIN  is.... it's not much bigger than a UHF connector !   The chassis flange on any 7-16 din is exactly 1.25"  square... VS  1"  square for any Type N or  SO-239 chassis connector.  

##  I don't have time nor patience for stuff arcing/flashing over/blowing up these days...esp at the top of a tower... and worse yet, at the top of a mast...or way out on the boom..and ditto with remote switch box's, lightning arrestor's, and anything else.
nothing worse than trying to trbl shoot stuff..... at night,  or in the rain/snow/ice, lousy WX, high winds etc.   It's  bad enough on a sunny afternoon.  Of course, trbl shooting also implies  un-doing all the  tedious vapor warp, wx proofing you just installed b4. Then you might have to take  sveral connectors apart, find the right one, try and fix it....then WX proof  several connectors.    Then it will just happen again anyway.  IMO,  just do it right the 1st time.

later... Jim   VE7RF  

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