Re: [Elecraft] loss of RX sensitivity

2018-09-19 Thread Eric Swartz - WA6HHQ, Elecraft
Lets close this thread - we are -way- past the max posting number limit for a single topic. Folks - I am not always able to watch the list in real time. Please self limit on OT discussions like this. Once you hit 5-10 emails (at most) please take it off list. You do not need to wait for me to

Re: [Elecraft] loss of RX sensitivity

2018-09-19 Thread Dave B via Elecraft
No, BNC's and N's do not inter-mate, not without damage. Yes, you can push a N plug into a BNC socket, but the BNC socket will be permanently damaged if you push hard enough for it not to fall out unexpectedly.  Plus the mismatch will be bad.  But in an emergency? Yes, the dimensions of the actua

Re: [Elecraft] loss of RX sensitivity

2018-09-19 Thread Walter Underwood
> On Sep 19, 2018, at 7:24 AM, hawley, charles j jr > wrote: > > As I remember, the bnc and n actually plug together. What then is the benefit > of n? Water resistance? > > Chuck Jack > KE9UW Type N is weatherproof, BNC is not. Type N peak voltage is 1500 V, BNC is 500 V (UHF is also 500 V)

Re: [Elecraft] loss of RX sensitivity

2018-09-19 Thread hawley, charles j jr
t; over 150W at up to 220MHz even in the presence of some very bad VSWR's >> (6:1 or higher.) Assemble them correctly and look after them >> physically, and they will last a lifetime. >> >> The UHF series are just plain unreliable. It is no surprise that the >> mi

Re: [Elecraft] loss of RX sensitivity

2018-09-19 Thread Dave B via Elecraft
; Dave G0WBX (also G8KBV) > > > ---------------- >> On 18/09/18 19:45, elecraft-requ...@mailman.qth.net wrote: >> Message: 1 >> Date: Mon, 17 Sep 2018 16:45:10 -0700 >> From: Walter Underwood >> T

Re: [Elecraft] loss of RX sensitivity

2018-09-19 Thread Dave B via Elecraft
e them any more. 73. Dave G0WBX (also G8KBV) On 18/09/18 19:45, elecraft-requ...@mailman.qth.net wrote: > Message: 1 > Date: Mon, 17 Sep 2018 16:45:10 -0700 > From: Walter Underwood > To: "elecraft@mail

Re: [Elecraft] loss of RX sensitivity

2018-09-18 Thread hawley, charles j jr
wes_n...@triconet.org] Sent: Tuesday, September 18, 2018 12:51 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] loss of RX sensitivity It's difficult to argue with Frank's experience and expertise. That said, fools rush in... I own some network analyzers, 1) an N2PK which I bu

Re: [Elecraft] loss of RX sensitivity

2018-09-18 Thread Wes Stewart
Hi Frank, Agreed. See: https://www.sdr-kits.net/VA5_Page  bottom of the page. Indicative prices in USD $191.77 Wes On 9/18/2018 1:53 PM, donov...@starpower.net wrote: Hi Wes, Thanks for forwarding the information about DG5MK's new FA-VA5 VNA.  What is its current selling price? If you us

Re: [Elecraft] loss of RX sensitivity

2018-09-18 Thread riese-k3djc
t > doesn't > maintain sufficient engagement force to keep the RF connections > in proper alignment. > > > 73 > Frank > W3LPL > > > > > - Original Message - > > From: "Wes Stewart" > To: elecraft@mailman.qth.net

Re: [Elecraft] loss of RX sensitivity

2018-09-18 Thread Jim Brown
On 9/18/2018 1:53 PM, donov...@starpower.net wrote: What is its current selling price? Frank, I believe it's under $200.  https://www.sdr-kits.net/VA5_Page 73, Jim __ Elecraft mailing list Home: http://mailman.qth.net/mailman/list

Re: [Elecraft] loss of RX sensitivity

2018-09-18 Thread donovanf
an.qth.net Sent: Tuesday, September 18, 2018 5:51:45 PM Subject: Re: [Elecraft] loss of RX sensitivity It's difficult to argue with Frank's experience and expertise. That said, fools rush in... I own some network analyzers, 1) an N2PK which I built with type N connectors, 2) a DG8SAQ V

Re: [Elecraft] loss of RX sensitivity

2018-09-18 Thread Wes Stewart
It's difficult to argue with Frank's experience and expertise.  That said, fools rush in... I own some network analyzers, 1) an N2PK which I built with type N connectors, 2) a DG8SAQ VNWA-3, supplied with SMA connectors and 3) a RigExpert AA-55 Zoom with a SO239.  Professionally, I've used ana

Re: [Elecraft] loss of RX sensitivity

2018-09-18 Thread donovanf
Captivated pin N connectors completely resolve the problem of the center pin pulling back in cold weather. 73 Frank W3LPL - Original Message - From: "Dr. William J. Schmidt" To: "Elecraft Reflector" Sent: Tuesday, September 18, 2018 3:29:41 PM Subject: Re

Re: [Elecraft] loss of RX sensitivity

2018-09-18 Thread Dr. William J. Schmidt
[[The next time someone challenges me on why I only use BNC and Type N connectors, I’m going to send them this entire discussion.]] Unfortunately this is not perfect either. If you use an "N" connector on long runs of heliax in a cold climate, you must be aware that the coefficients of expans

Re: [Elecraft] loss of RX sensitivity

2018-09-17 Thread hawley, charles j jr
Trouble is I have to put adapters on the equipment and then go to bnc Chuck Jack KE9UW Sent from my iPhone, cjack > On Sep 17, 2018, at 6:46 PM, Walter Underwood wrote: > > The next time someone challenges me on why I only use BNC and Type N > connectors, I’m going to send them this entire

Re: [Elecraft] loss of RX sensitivity

2018-09-17 Thread donovanf
t: Monday, September 17, 2018 11:45:10 PM Subject: Re: [Elecraft] loss of RX sensitivity The next time someone challenges me on why I only use BNC and Type N connectors, I’m going to send them this entire discussion. wunder K6WRU Walter Underwood CM87wj http://observer.wunderwood.org/ (my

Re: [Elecraft] loss of RX sensitivity

2018-09-17 Thread Wes Stewart
Pretty much my point made in another post. In fact, I often take a perverse view of these situations and ask myself, "Self, if you wanted to screw these two things together without the faces touching, how difficult would it be to do?"  And of course the answer is, almost impossible. Wes  N7ws

Re: [Elecraft] loss of RX sensitivity

2018-09-17 Thread Wes Stewart
This is one of those, "it depends" situations.  Depending on the location of the two center conductor insulators in the plug and socket, the serrated (toothed) surface of the female connector might well contact the mating plug surface, if there is a gap between the insulators. In fact the "tight

Re: [Elecraft] loss of RX sensitivity

2018-09-17 Thread Walter Underwood
The next time someone challenges me on why I only use BNC and Type N connectors, I’m going to send them this entire discussion. wunder K6WRU Walter Underwood CM87wj http://observer.wunderwood.org/ (my blog) > On Sep 17, 2018, at 4:41 PM, Don Wilhelm wrote: > > Andy, > > The PL259 to SO239 con

Re: [Elecraft] loss of RX sensitivity

2018-09-17 Thread Don Wilhelm
Andy, The PL259 to SO239 connector "end face" contact is provided only by pressure - it is not a sliding contact as you would find in a BNC or an N connector. The pressure is provided only by the tightening of the threaded portion of the PL259. I ask you - just how much resistance can be ex

[Elecraft] loss of RX sensitivity

2018-09-17 Thread ANDY DURBIN
" the threads of the PL259 are providing the only contact with the SO239" In the connectors that you are mating how do you prevent contact between the end face of the PL259 body and the end face of the SO239 body? You would need an insulating spacer for your statement to be true. 73, Andy k3

Re: [Elecraft] loss of RX sensitivity

2018-09-17 Thread Don Wilhelm
Chuck, That is true, but is ignoring the fact that the threads of the PL259 are providing the only contact with the SO239. They must be solidly tight for reliable conductivity to the shield of the coax. All contact from the SO239 to the coax shield is by pressure contact. Finger tight may

Re: [Elecraft] loss of RX sensitivity

2018-09-17 Thread hawley, charles j jr
, BMW Motorcycles From: elecraft-boun...@mailman.qth.net [elecraft-boun...@mailman.qth.net] on behalf of Jim Brown [j...@audiosystemsgroup.com] Sent: Monday, September 17, 2018 2:44 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] loss of RX sensitivity On

Re: [Elecraft] loss of RX sensitivity

2018-09-17 Thread Bob McGraw K4TAX
Yes, regardless of how good they look, always snug the PL-259 with a small pair of Channel Lock pliers. Finger tight is not good enough. Many of our connectors today are of inferior quality. Also due to the use of jumpers, the flexing and pulling is prone to damage the connection between t

Re: [Elecraft] loss of RX sensitivity

2018-09-17 Thread Jim Brown
On 9/17/2018 9:20 AM, Drew AF2Z wrote: Note that there is no electrical connection through the threads on the plug body and the threads on the shell; these threads are merely a stop to keep the shell from sliding down the cable when not connected to the SO-239 on the equipment. This is simply

Re: [Elecraft] loss of RX sensitivity

2018-09-17 Thread Ian
Real easy to see on a spectrum analyzer with a tracking generator. The trace goes wild as soon as you start turning the PL-259 connector by hand (please don't use pliers on your SA). 73, Ian N8IK On Mon, Sep 17, 2018 at 12:59 PM, Don Wilhelm wrote: > Drew and all, > > I beg to differ, unless y

Re: [Elecraft] loss of RX sensitivity

2018-09-17 Thread Don Wilhelm
Drew and all, I beg to differ, unless you meant something different than I read. The threads on a PL-259 connector are the only thing that connects the coax shield to the SO-239 jack. That is why hand tightening of PL-259 connectors is not sufficient. Use pliers to snug them up just a bit mo

Re: [Elecraft] loss of RX sensitivity

2018-09-17 Thread Drew AF2Z
I used that trick to keep my DSL line running for a couple of years when Verizon was abandoning copper and no longer interested in doing maintenance. Placing a resistor across the telephone line would draw a constant small current, not enough to off-hook the line but enough to "seal" the poor c

Re: [Elecraft] loss of RX sensitivity

2018-09-17 Thread Gwen Patton
Reminds me of having to blow on the contacts in a Nintendo game cartridge to make it work in the console. ;) On Mon, Sep 17, 2018 at 7:31 AM rich hurd WC3T wrote: > I guess that’s the electronic equivalent of blowing through a tube to clear > the blockage. :) > > On Mon, Sep 17, 2018 at 01:44 F

Re: [Elecraft] loss of RX sensitivity

2018-09-17 Thread rich hurd WC3T
I guess that’s the electronic equivalent of blowing through a tube to clear the blockage. :) On Mon, Sep 17, 2018 at 01:44 Frederick Dwight wrote: > Scott, > The problem you describe is actually quite common in electronics. In > the telephone industry, especially in the “good old days” wi

[Elecraft] loss of RX sensitivity

2018-09-16 Thread Frederick Dwight
Scott, The problem you describe is actually quite common in electronics. In the telephone industry, especially in the “good old days” with wire cables, sometimes with many splices it was common to get drop outs. These could be due to a splice, wire wrap connection, oxidized relay contact