Have you built the transmitter  ?

I may have given you the wrong information regarding the value of the external parallel capacitor....
Have new figures now using a higher LC ratio....
A smaller inductor of .9uH ....
That is 10T on a .750mm former and this would be easier to pull squeeze to change the inductance for resonance or maximum efficiency....
Also I used the Drain Source capacitance of 300pF which is incorrect....
It should be the Reverse Transfer Capacitance which is 40pF per FET totalling appox 160pF....
So the external capacitor should be 8000pF appox for a resonance at 1876Khz....

Wayne

Thanks for the update. I guess I just didn’t notice it☹️

  There was, actually, one large building open, with commercial vendors inside, although no HRO. It was the large white building that overlooks the lower lot; the building where they've often had VE exams and presentations and such in the past. It was the buildings that were at the heart of the Thursday/Friday change. The Deerfield Fairgrounds apparently makes a bit of money in the off-season months by renting out space in those buildings for the storage of items like boats, classic cars, RV's, tractors, and whatever, and due to some miscommunication the date on which the buildings were to be vacated fell on the same Saturday as Nearfest.

I will get some pictures within a week.

This is a 100/500w AM/CW/FSK transmitter.

Email me for photos, but it looks in good condition from the ones Tom sent me.

4-400 final modulated by 4-125s in 500w configuration. Includes the p/s for 100w operation but the “high-level” 3-phase HV supply is not in Tom’s list. So the SK (ex-Collins engineer) probably ran it off a separate HV supply in 500w mode. But the “high-level” modulator section with hefty mod xfmr is included.

Email Tom for more info.
The manual is at
https://www.navy-radio.com/manuals/srt14-manual.htm

And there was an article in April 1997 Electric Radio.

Feel free to forward to interested parties.

Nick England K4NYW
www.navy-radio.com


---------- Forwarded message ---------
From: Tom Hess <tomhess8@gmail.com>
Date: Fri, Apr 26, 2024 at 3:30 PM
Subject: Navy radios need a new home
To: <nick@navy-radio.com>


My name is Tom Hess and I am active in amateur radio. I am helping a local family to dispose of ham radio equipment after a family member died. I am trying to find a new home for a Navy radio set which I think is designated SRT-15. It consists of six rack mounted units and the corresponding rack to mount all the pieces. Attached are photos of all the parts. All of this radio set is located near Cedar Rapids, Iowa. I believe that all parts are operational.

Please let me know if your organization is interested in this radio set or if you know of other organizations that would be interested.

Part numbers for individual pieces:

MD-229, MD-230, O-275, PP-1094, PP-1095, AM-1008

Thank you,
Tom Hess,  KD0HF
email:  tomhess8@gmail.com

My friend, Ernie KO2E, and I attended both days we also felt the attendance was off quite a bit from previous years. You certainly couldn’t beat the weather! We had setup in the sun and it was very comfortable.
We did notice none of the buildings were open and I didn’t see any major vendors like HRO. I did ask someone and he mentioned a bug problem but he may have joking.

Overall we had decent time selling and there was a lot more room in my SUV on the way back to Saratoga. We were pricing things to sell and gave some stuff away. It’s a well run fest. Kudos to the staff!

Steve
WA2TTP P

A number of years back, I was at the Sussex Hamfest, and a 3cx3000f1 jumped out at me and said 'Take me home'.
 I had an idea of building an induction heater, to braze carbide bits for saw blades. I disassembled and sold the circle mill, no need to keep this tube around.
 Is there any use for a low gain, high plate dissipation triode in amateur service?
 Thanks, Ed, AB3HT, Ex wb3eii

Mike Dishop, N8WFF, wrote a fairly good dissertation about the current state of making amateur radio products in the US. For those who don't know, N8WFF purchased Alpha and Ten-Tec and has been having issues trying to get them re-started coming out of the 'pandemic'. His tome is on this page on QRZ: https://forums.qrz.com/index.php?threads/mfj-closing-down-manufacturing-facilities-effective-may-17th-2024.911452/page-13

MFJ has been up for sale for nearly a year with no takers. Owner is in his 80s and wants to retire.

That would be very helpful if you can take a picture of T2.

Tnxs,

Joe