Top band transmitter - Page 3 - UK Vintage Radio Repair and Restoration Discussion Forum

Ian - G4JQT · 14th Apr 2020, 10:18 am

Yes David, you're quite right bout the HT being incorrectly labelled in the manual.

Very early on the Ia meter was wired to actually be in the anode not as shown in the circuit.

The top and wiper of the mod level control are also shown swapped over.

There were also other minor mods around the oscillator, a tap in the output inductor switched with the band change, and changes around the Rx-Net-Tx switch to give a better netting signal. I think most of them plus some other unofficial mods are in the G3UPA link above and written by Dave Gordon-Smith, G3UUR

This isn't a thread about the AT5 transmitter, but if anyone wants it I can email them my AT5 article that was published in PW some years ago. There's loads on the web about this tx so anyone wanting to build their own or fix one should have plenty of information.

mickm3for · 14th Apr 2020, 10:03 pm

Hi i have an AT5 in good condition would love pw article i must use this rig more as we have lots of time at the moment. I to had another years agow that i converted to a lower frequency (1133 khz) and xtal controled Mick

Ian - G4JQT · 14th Apr 2020, 10:36 pm

Quote:

Originally Posted by mickm3for

Hi i have an AT5 in good condition would love pw article i must use this rig more as we have lots of time at the moment. I to had another years agow that i converted to a lower frequency (1133 khz) and xtal controled Mick

OK. Please PM me with your email address. I don't think I can send attachments via forum messaging.

Aub · 15th Apr 2020, 10:36 am

Wasn't 1133Khz Radio London, "Big L" ? 😄

mickm3for · 15th Apr 2020, 11:58 am

Hi yes it was ,it was also used in the mid 70s in
London as Radio kaleidoscope, many of the djs went on to ilr stations etc Pat Edison Radio Caroline, Mike Baker Beacon Radio , Dave Owen Radio Jacky,
http://www.radiokaleidoscope.co.uk/ . Mick

14th Apr 2020, 10:18 am	#41
Ian - G4JQT Octode Join Date: Jun 2004 Location: Reading/Fakenham, UK. Posts: 1,323	Re: Top band transmitter Yes David, you're quite right bout the HT being incorrectly labelled in the manual. Very early on the Ia meter was wired to actually be in the anode not as shown in the circuit. The top and wiper of the mod level control are also shown swapped over. There were also other minor mods around the oscillator, a tap in the output inductor switched with the band change, and changes around the Rx-Net-Tx switch to give a better netting signal. I think most of them plus some other unofficial mods are in the G3UPA link above and written by Dave Gordon-Smith, G3UUR This isn't a thread about the AT5 transmitter, but if anyone wants it I can email them my AT5 article that was published in PW some years ago. There's loads on the web about this tx so anyone wanting to build their own or fix one should have plenty of information.

14th Apr 2020, 10:03 pm	#42
mickm3for Heptode Join Date: May 2015 Location: Chatham, Kent, UK. Posts: 964	Re: Top band transmitter Hi i have an AT5 in good condition would love pw article i must use this rig more as we have lots of time at the moment. I to had another years agow that i converted to a lower frequency (1133 khz) and xtal controled Mick

15th Apr 2020, 10:36 am	#44
Aub Nonode Join Date: Mar 2005 Location: Nuneaton, Warwickshire, UK. Posts: 2,039	Re: Top band transmitter Wasn't 1133Khz Radio London, "Big L" ? 😄 __________________ Life's a long song, but the tune ends too soon for us all.

15th Apr 2020, 11:58 am	#45
mickm3for Heptode Join Date: May 2015 Location: Chatham, Kent, UK. Posts: 964	Re: Top band transmitter Hi yes it was ,it was also used in the mid 70s in London as Radio kaleidoscope, many of the djs went on to ilr stations etc Pat Edison Radio Caroline, Mike Baker Beacon Radio , Dave Owen Radio Jacky, http://www.radiokaleidoscope.co.uk/ . Mick