For those who have experience with the Eimac 7289 or equivalent power triode, what is the maximum reasonable anode cooler temperature that I should not exceed in order to get a good tube life? I see 85 degrees Celcius using an IR thermometer after several minutes of calling CQ with 150W output on 1296MHz (dual-7289 amp). Note that the cathodes also have forced air cooling though vents on the cavity walls.
Thanks in advance.
73 Rick .PA1BVM
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On Tue, May 24, 2011 at 12:44 AM, Bill Dzurilla <billdz.geo(a)yahoo.com> wrote:
> Do you mean the old Moon-Net at moon-net(a)list-serv.davidv.net? That does not seem to be working for me. Please advise how to get back on.
> 73, Bill NZ5N
It maybe changed as follows,
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Date: Sun, 22 May 2011 17:58:54 -0400
Subject: NET NOTES MAY 22, 2011
I do not plan to be here next weekend hope that N4PZ will be
able to run the NET.
73 es good echoes de Joe K1RQG
I have listed the Activity Periods below for 70 cm & 144 Mhz.
Be aware that there are two for each weekend, one is common
window with EU and JA and the other is common window NA & EU.
Coming dates for 432 CW EME Activity
Frequencies 432.005-432.030 CW
0500 - 0700 GMT
1100 - 1300 GMT
(Dubus 23cm CW EME contest)
0800 - 1000 GMT
1500 - 1700 GMT
2300 - 0100 GMT
0700 - 0900 GMT
ARRL EME Contest (13cm & up)
ARRL EME Contest (6m-23cm)
ARRL EME Contest (6m-23cm)
0300 - 0500 GMT
1830 - 2030 GMT
Dates/times for 2011
Frequency 144.040-144.060 CW
June 26 0100-0400 GMT
June 26 0900-1200 GMT
July 23 2300-0200 GMT
July 24 0800-1100 GMT
Aug 27 0330-0630 GMT
Aug 28 1300-1600 GMT
September: no 2m ATP, ARI CW EME Contest.
October-November: no 2m ATP, ARRL EME Contest
Dec 3 1200-1500 GMT
Dec 3 2030-2330 GMT
Good to hear from you, Joe. Hope all is well.
I am still sorting thru all my VHF uhf stuff, and the box that needs a new
home today is about 20 pounds of 4X150A, 4CX250B, 4CX250R tubes, sockets,
air chimneys, and a few other odd assorted goodies. Some are new, some are
known good, some are untested, sockets are Eimac and Johnson, mix of earlier
and later sockets.
If anybody is interested I'd like them to email me directly at
rhattaway(a)rocketmail.com (this address).
QRX, but not SK (c:
this is to remind you of the oncoming XX/DL1YMK 2011 DXpedition. We hope to
be QRV on 23cm at first on 28th of May. As in the past years this is meant
to be a truly random event. In order not to diminish the fun for others,
please do not reveal the actual call sign in clusters, chats etc. in case
you've already worked us.
However, if your station is small and you feel more comfortable with arranging
a sked with us, then feel free to drop us a line by email to make a proposal
in accordance with the preliminary band schedule published on this reflector
The email in box will be last checked on Tuesday night, 24th of May. Thereafter,
email communication might be disrupted or sporadic at best, as we expect to
have no (continuous??) internet access on the site.
This year, the DXpedition site is again more prone to weather imponderabilities,
so expect unforeseen incidents – we do at least ;-))
73/88 de M & M - team
WB7QBS: doing sun noise checks on 70 cm.
WB2BYP: not too much to report, has now put control lines in PVC pipe to dish
to be buried. will be on 23 cm EME next weekend.
W7CJO: got up early to joined the net.
VE3KRP: not much to report, very foggy, long weekend and working on inside shack.
was on 6 meters yesterday and worked VE6TA on CW.
K0DJV: Paul, negative on EME (may be involved with 60' dish project)
KB8VAO/M: on way home from Dayton, nice time and good wx. minimum size dish to
work 10 Ghz on EME ? for Barry. 10 foot dish and 10 W at feed.
EA7/DK3NG: Jo, no change from yesterday. looking for SM2CEW status from yesterday
K0TAR: not much for net
KG6WVS: Tom, Northern Californian, not on EME
SM2CEW: HF amp seems to be working again. amp still not 100%. been out operating
QRP on 80 & 40 meters in Scandanavian contest. all QRP contest. not much
more to report on EME.
VE4MA: good day yesterday, and getting ready for preliminary tests on 78 GHZ
system. needs to do more work on P/S. plans to be in AZ from Nov to Apr.
Apache Jct, AZ. report on K0ALL that he is in rehab.
W3FGP: Maurice, looking for Steve N4PZ.
WA7QIT: Idaho, Ed just tuning by
VA3JTP: Grimsby, Ont radio check
WW2R: was 13 cm last weeks now back to 23 cm for DL1YMK.
VA3DZ: Dave in Toronto
KD1VKS: Everet, MA
These are K1RQG's notes from 5/21/11 Steve Gross N4PZ / W9OJI
----- Forwarded Message ----
From: "K1rqg(a)aol.com" <K1rqg(a)aol.com>
To: chris(a)chris-bartram.co.uk; Anders(a)LA8LF.com
Sent: Sat, May 21, 2011 12:23:30 PM
Subject: NET NOTES MAY 21, 2011
NOTE: I have found my old EME mailing list, certainly not up to date! I
ran the NET today and thought I would try to see if this still works. This
weekend is DAYTON, so the attendance was down a bit. It is nice to
hear some old friends on as well as new ones as well.
73 de Joe K1RQG
K1RQG: still on 23 cm EME here. also gearing up for 2 meter EME, looking for
ideas for feed for .5 f/d dish for 2 meters as well as 222 Mhz. no
promises, but will give it a whirl. 2 meters first, then will try to
convert amp to 222 Mhz. k1rqg(a)aol.com
N0OY: echo tested the other night and getting revved up again. been busy
doing other things. replaced shaft encoders, and all is working on
23 cm EME. Pete taught an engineering class and got some young folks
interested in microwave and looks like they will be getting active
as well as some local hams. 10 of the young folks got their licenses
and some even to extra class. Pete also is trying to encourage them
to work CW. took a van full to Dayton last year. Will try to get a
group to show up the weekend for Dubus 23 cm EME.
VE3KRP: been in Min for a couple of weeks, but now back at home playing with
10 Ghz. will be back on EME next weekend.
VE4MA: just working on HV stuff and working inside stuff as it is raining.
WB2BYP: not too much today, will try to be on tomorrow, and then again the
weekend for contest. still working on PA but has 175 W from TH-328
driver to use on moon.
VE6TA: not too much to report, still has 13 cm feed in, and will switch to
23 cm by the contest weekend. has received mini-verter from DEMI
for $49 to interface with FLEX-1500. IF is around 34 Mhz, all details
are on the Down East Microwave site.
K0RZ: no EME activity, has not been on since last June. No motivation to
get going. still on 70 cm EME only, no interest in digital.
SM2CEW: back home from a flea market. also attended meeting that SM4IVE had
organized in Sweden and it was a great meeting. will be on for next
activities on moon.
W4OP: not much new, working on DC voltage problem on the Jeep.
EA7/DK3NG: Joe, 2 meter EME CW only. currently on coast of Spain at summer
get away. thinking of getting on 23 cm and up from home in Germany.
also hopes to bring small dish to Spain and try EME. dk3ng(a)arrl.net
W0EEB/M: Brian, nothing for the net
These are the remaining preamps that I have for sale that I took to the
Tornado'd SVHFS conference.
144Mhz , N conn, .10dbnf / 22.23dbGain $75 + Ins Shipping ($8 CONUS)
144Mhz, N Conn, High Gain, .20dbnf / 30.10dbGain $75 + Ins Shipping ($8
902/3Mhz, BNC Conn, .26dbnf / 19.47dbGain $75 + Ins Shipping ($8 CONUS)
902/3Mhz SMA Conn, .14dbnf / 18.22dbGain, $75 + Ins Shipping ($8 CONUS)
This is the last of them unit next years SVHF Conference in Charlotte.
How many guys working on EME 222 Mhz ?
Asking because I'll receive next week end full setup on 222 Mhz. AM-6155 PA,
17 elements Cuscraft 220B yagi and ft-736r module.
It will work without elevation at beginning but if lot OM going on 222 MHz,
possible way to put on Az/El system later in summer.
Thanks all and see you later on the moon.
73 Dan in FN35hs