Alot of Heterodynes espeicaly noticed on SSB.Very good receiver,I own one,but I dont get all the heterodynes as you do.I have noticed on mine,if there is any outside electrical buzz/interferance/rain static it really interferes with the BFO on Side Band and the noise over rides the BFO signal.
I have changed the SW "Cal" notch knob to the same type as the RF control knob.Far easier to operate and fitted a Coaxal female socket at the back of the radio to connect my outside antenna. Better than the clip connectors.
Beautiful restoration -I have the same model Panasonic RF-2900 and have tried everywhere to find a replacement whip antenna .-Any ideas? with appreciation
Nice video of a beautiful radio. Congrats on having finished its restauration. Judging from the ghost signals outside the broadcast bands, its image rejection seems to be quite poor. Otherwise its performance seems to be good, even SSB sounds decent for a portable of its class and age. Well done! 73!
+senderjaeger thank you! Indeed there are image signals, I didn't notice them before, thanks for mentioning it. It's a little bit strange cuz receiver has double conversion... I wonder if I could eliminate them somehow... maybe by tuning input filters? I will have to investigate it. 73s mate!
I have this radio which I bought in 1989. Still functioning excellently. Can someone tell me where to buy the same antenna? Mine is broken 😢! Thanks for any answer.
Hello, I have just acquired a DR28 in very good cosmetic shape, however it is only able to produce sound in FM, and dead silent in other bands. It will often read signal strength to be good, but produce no sound in. I have no prior experience with this types of radio, did I miss a setting somewhere or is something broken? Thanks
Hello, if you have no sound at all and signal strength meter shows the signal, then the most probably AM Demodulator circuit is broken... at least that's my conclusion when looking to the block diagram of the radio www.radiomanual.info/schemi/RX/Panasonic_RF-2900_serv.pdf eventually you can check the BFO on/off switch and try to put it in a different positions and check if you can hear something, if AM Demodulator is really broken, then you should be able to hear something in SSB mode and vice versa... I wish you luck in troubleshooting because it's great radio to play with :) 73!
at second glance It also might be broken BFO switch itself... because block diagram shows that it relays demodulated AM/SSB signal to Audio Amplifier so if the switch has bad contact, you may hear nothing from my experience this radio has a not very good quality switches, you can use some 'contact cleaner' to clean it, I would start trouble shooting from it
@@chrisd756 Same with the one I just bought...everything except the AM bands work well. Nice analogue tuning mechanism, lights, digital frequency counter are fine. Stations can be picked up on MW & LW BUT the volume is so low it's unuseable. Any ideas?
@@andrewjackson246 if the volume is really low but you can pick up some stations it is usually indication of leaky electrolytic capacitors in the audio amplifier. I would start from recapping all electrolytics in the audio section or even in the whole radio.
@@chrisd756 Thanks...to be expected I suppose for a 40+ year old radio. Got it for £40 (after partial refund today) with an electrolyte leak in the battery compartment & corroded spring terminals...so a little more wrong than that then. Gave it a careful (soft cotton cloth & old toothbrush/q tips) but thorough clean with WD40 to remove dirt & it now looks close to MINT, with the dried leak easily removed, along with those easily replaceable corroded springs. As for the inside, just a little dried elec on the bottom with no damage to ANY components, thank goodness. Suppose a careful squirt of dioxIT d5 would be a good idea for all switches too at some point...IF access can be found?
Well done! Congratulations on this amazing radio! 73!
Lovely Radio
DR 28 NP JAPAN VERY NICELY RADIO !
Alot of Heterodynes espeicaly noticed on SSB.Very good receiver,I own one,but I dont get all the heterodynes as you do.I have noticed on mine,if there is any outside electrical buzz/interferance/rain static it really interferes with the BFO on Side Band and the noise over rides the BFO signal.
I have changed the SW "Cal" notch knob to the same type as the RF control knob.Far easier to operate and fitted a Coaxal female socket at the back of the radio to connect my outside antenna. Better than the clip connectors.
Beautiful restoration -I have the same model Panasonic RF-2900 and have tried everywhere to find a replacement whip antenna .-Any ideas? with appreciation
Nice video of a beautiful radio. Congrats on having finished its restauration. Judging from the ghost signals outside the broadcast bands, its image rejection seems to be quite poor. Otherwise its performance seems to be good, even SSB sounds decent for a portable of its class and age. Well done! 73!
+senderjaeger thank you! Indeed there are image signals, I didn't notice them before, thanks for mentioning it. It's a little bit strange cuz receiver has double conversion... I wonder if I could eliminate them somehow... maybe by tuning input filters? I will have to investigate it. 73s mate!
@@chrisd756 best to take you antenna shorter did you listen to the MW band tu gl 73, ON3MK Mor
I have this radio which I bought in 1989. Still functioning excellently. Can someone tell me where to buy the same antenna? Mine is broken 😢!
Thanks for any answer.
Super Radio
এই রেডিও টি পাওয়া গেলে এটার বর্তমান price/value ? Pls
Hello, I have just acquired a DR28 in very good cosmetic shape, however it is only able to produce sound in FM, and dead silent in other bands. It will often read signal strength to be good, but produce no sound in.
I have no prior experience with this types of radio, did I miss a setting somewhere or is something broken?
Thanks
Hello,
if you have no sound at all and signal strength meter shows the signal, then the most probably AM Demodulator circuit is broken...
at least that's my conclusion when looking to the block diagram of the radio www.radiomanual.info/schemi/RX/Panasonic_RF-2900_serv.pdf
eventually you can check the BFO on/off switch and try to put it in a different positions and check if you can hear something, if AM Demodulator is really broken, then you should be able to hear something in SSB mode and vice versa...
I wish you luck in troubleshooting because it's great radio to play with :)
73!
at second glance It also might be broken BFO switch itself... because block diagram shows that it relays demodulated AM/SSB signal to Audio Amplifier
so if the switch has bad contact, you may hear nothing
from my experience this radio has a not very good quality switches, you can use some 'contact cleaner' to clean it, I would start trouble shooting from it
@@chrisd756 Same with the one I just bought...everything except the AM bands work well. Nice analogue tuning mechanism, lights, digital frequency counter are fine.
Stations can be picked up on MW & LW BUT the volume is so low it's unuseable. Any ideas?
@@andrewjackson246 if the volume is really low but you can pick up some stations it is usually indication of leaky electrolytic capacitors in the audio amplifier. I would start from recapping all electrolytics in the audio section or even in the whole radio.
@@chrisd756 Thanks...to be expected I suppose for a 40+ year old radio.
Got it for £40 (after partial refund today) with an electrolyte leak in the battery compartment & corroded spring terminals...so a little more wrong than that then. Gave it a careful (soft cotton cloth & old toothbrush/q tips) but thorough clean with WD40 to remove dirt & it now looks close to MINT, with the dried leak easily removed, along with those easily replaceable corroded springs.
As for the inside, just a little dried elec on the bottom with no damage to ANY components, thank goodness.
Suppose a careful squirt of dioxIT d5 would be a good idea for all switches too at some point...IF access can be found?
after the volume control was broken and you could not spray the volume control with contact spray, I threw this bullshit radio away