The AM Forum
March 28, 2024, 03:40:05 PM *
Welcome, Guest. Please login or register.

Login with username, password and session length
 
   Home   Help Calendar Links Staff List Gallery Login Register  
Pages: [1]   Go Down
  Print  
Author Topic: T-47A/ART-13 on LF, CU-25 replacement?  (Read 5119 times)
0 Members and 1 Guest are viewing this topic.
SM6OID
Member

Offline Offline

Posts: 220



« on: April 02, 2020, 09:08:10 AM »

Hi!

So, if I want to use my T-47A/ART-13 on 630 m, how to make that happen?
I was thinking of having a "tank cirquit" that matches to a 50 Ω feedline.
Or any other cleaver idea?
Logged

RADIO: 51J-4, R-390A, SP-600 JX-21, BRT-400, Set No 19, T-47/ART-13, RF-590, SRT CR91, BC-312D, BC-348Q, HF-8020/8030/8010A/8090,  and much more...

ENGINE: Zvezda M50 F6L (V12), Rolls-Royce Meteor mk4B/2 (V12), Rolls-Royce B80 (inline 8 ) and much more
Noddyswl
Member

Offline Offline

Posts: 6


« Reply #1 on: May 23, 2021, 09:22:10 AM »

HI...the ART13 was from memory not 50 ohm out but matched to antenna impedance througha 'tuner' . It used a trailing antenna and the winding gear for the antenna was calibrated for frequency.

You will find information on internet about using capaciors at the antenna outlet which are suited to the voltage and frequency.

My set actually has a cunning device installed to tune the tank to antenna but there's a lot of info around including a Collins u-tube video covering a lot on the set..also covering  repairs. Does that help at all? I can't refind the brilliant ART-13 book which was saved on my computer so I'll have to go trying to find it to post access on the site. My Regards
Logged
SM6OID
Member

Offline Offline

Posts: 220



« Reply #2 on: May 23, 2021, 10:20:27 AM »

Hi!

I do know what needs to be done to make it work well into a 50 Ω load between 2-18 MHz.
The question is how to use in the LF range, thinking of the 472 kHz band.
Logged

RADIO: 51J-4, R-390A, SP-600 JX-21, BRT-400, Set No 19, T-47/ART-13, RF-590, SRT CR91, BC-312D, BC-348Q, HF-8020/8030/8010A/8090,  and much more...

ENGINE: Zvezda M50 F6L (V12), Rolls-Royce Meteor mk4B/2 (V12), Rolls-Royce B80 (inline 8 ) and much more
KA3EKH
Member

Offline Offline

Posts: 772



WWW
« Reply #3 on: May 24, 2021, 01:50:43 PM »

Just curious, why do you want a 50 Ohm line and match? Its not like you will be easily able to match an antenna unless you have something that’s around a thousand feet long. Understand that you can build a base tuning network for feeding from the transmission line to the antenna but why not just use a open wire feedline between the transmitter and antenna and go with a higher impedance transmission line like the open wire they did in military use?


Logged
SM6OID
Member

Offline Offline

Posts: 220



« Reply #4 on: June 21, 2021, 04:52:18 AM »

Hi!

The situation is like this, today I do not have a CU-25 or anything like it.
I wish to put out a signal on 630 m.

Why matching to 50 Ω?
With the current physical layout of my shack and antenna arrangements, I feel that this is the most (only?) practical solution?

So, the original question is back, any suggestions of how to solve this?
Logged

RADIO: 51J-4, R-390A, SP-600 JX-21, BRT-400, Set No 19, T-47/ART-13, RF-590, SRT CR91, BC-312D, BC-348Q, HF-8020/8030/8010A/8090,  and much more...

ENGINE: Zvezda M50 F6L (V12), Rolls-Royce Meteor mk4B/2 (V12), Rolls-Royce B80 (inline 8 ) and much more
Pages: [1]   Go Up
  Print  
 
Jump to:  

AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
 AMfone © 2001-2015
Powered by SMF 1.1.21 | SMF © 2015, Simple Machines
Page created in 0.051 seconds with 19 queries.