[HomeBrew] HOMEBREWED Antenna Changeover relay.

[Rbethman]

Phil,

    I got the Johnson TR Switch 3 or 4 years ago off the Eplace.  
Actually didn't get it for a bad price.

    I HAD to go that way with the BC-610 and T-213.  Anything that just 
"plops" a 400W carrier out there requires SPECIAL treatment.

    Isolation from <1uv receivers make it a bit hairy.  The "break-in" 
system is okay, BUT I discovered that without actual CUT-OFF of the 
coaxial line to the R-390As resulted in massive feedback issues.

    And switching manually to standby, while throwing the remaining 
switches on the BC-610/T-213 was a major untaking.  There is another 
means of taking of all this, but it means locating and obtaining another 
portion of the GRC-26 system that is MORE rare than the R-390A ballast 
tube.  It is the JB-70 junction box that attaches to the BC-614 speech 
amplifier.  These are the REAL unobtanium!

    I've got one locked down in my name now - it has only taken four 
years to even locate it!  

    Yep!  I Meant it to say when I Key-up the TX - meaning go to TX 
mode.  What the heck!  I too make mistakes!

Bob - N0DGN

Philip B Atchley wrote:

>Hi Bob,
>Yep, I like building.  I've been doing it since the early '50s, though I
>don't do nearly as many really elaborate solid state projects as I used
>to.  My eyes aren't what they once were and working under a magnifier
>isn't my idea of fun.
>
>I got a chuckle out of that "400 Watt Backwave" !  I thought the same
>thing but just didn't say anything as I knew what you meant.  
>
>Yes, I expect that the Johnson TR-switch would do a nice job.  But I have
>to do with what I have.  Actually, the Hallicrafters SX-71 is pretty
>sensitive, just have to keep "tweaking" the tuning a little bit,
>especially if you're using the Xtal Filter.  On AM it's not very
>noticable.
>
>On another note.  I got an email from my friend yesterday and he asked if
>I would take that RCA SRR-11A in lieu of the cash as his situation had
>changed some too.  We'd discussed it in earlier mail and I'd told him I
>wasn't in a hurry.  Anyway, I said sure.  Actually, the SRR-11A is
>probably worth a fair amount more than he owes me, but he wasn't worried
>about it.  He knew I'd like to have one and that I do LOVE to chase
>longwave beacons.  About a year ago we thought that receiver was going to
>come down this way, but never got it worked out.  So now, I just have to
>figure out how to get it down here.  I may break down and drive up and
>get it (about 130 MIles North of here).  I don't like to take the car
>more than 30-40 miles from home as the check engine light has been lit
>for two years (bad transmission sensor).   The SRR-11A is a VLF-LF
>receiver that tunes 14-600KC in 6 bands, primarily in the A1 and A2 modes
>(CW and MCW).  It has good selectivity and a very accurate frequency
>display (optical) for an analog receiver.
>
>73 from the "Beaconeers Lair".
>Phil, KO6BB
>
>Where DX begins at the noise floor!
>Merced, Central California, 37.3N  120.48W  CM97sh
>    
>
>On Sun, 04 Jul 2004 11:33:08 -0400 Rbethman <rbethman at comcast.net>
>writes:
>  
>
>>Hey Phil, Way to go.  I have some small bud cabinets, and octal 
>>relays 
>>in both 12VDC and 120VAC.  I built one T/R relay for my DX-60B.
>>
>>Now I've gotten a E.F. Johnson amplified TR-Switch.  Has a take off 
>>for 
>>sampling the signal.
>>
>>Being amplified has an advantage for the receivers.  I have enough 
>>output - 400W on key up, so getting those with "smaller" stations, I 
>>can 
>>still pull them out!
>>
>>Bob - N0DGN
>>
>>Philip B Atchley wrote:
>>
>>    
>>
>>>** Please do NOT cross-post messages in the TO: or CC: field of the 
>>>      
>>>
>>e-mail message. **
>>    
>>
>
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>  
>

-- 
<                      Bob Bethman - N0DGN
+-------------------------------+----------------------------------+
| N0DGN AMRadio Manassas, VA    |    REAL Tube Radio and AM        |
+-------------------------------+----------------------------------+
|       Manassas Radio - Home of Homemade Kielbasa & Pirogi        |
+-------------------------------+----------------------------------+
| Bob Bethman                \\\|///     " The absence of a danger |
| rbethman(at)comcast.net   \\ ~ ~ //      signal does *NOT* mean  |
|                           (/ @ @ /)      that everything is OK " |
+-------------------------oOOo-(_)-oOOo----------------------------+
|               <http://home.comcast.net/~rbethman>                |
| 1 BC-610I w/BC-614I,1 T-213/GRC-26 w/BC614I 1 '51 Collins R-390A |
| 1 '67 EAC R-390A, Heathkit DX-60, Apache, Mohawk, SX-101, HT-32A |
+------------------------------------------------------------------+
|           Amateur Astronomer - Celestron Nexstar 8               |
|             12" f5 Dob coming soon!  Being built                 |
|                  Meade ETX-60 (Got it back!)                     |
|               38 Deg 46.8' N - 77 Deg 28.5' W                    |
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