Many thanks to SWLing Post contributor, Kostas (SV3ORA), who shares the following video and writes:
In this 7.8Mb video (attached) is my solution for “converting” the Yaesu FRG-7 for single signal reception on SSB:
Not a mod actually, no additional filters, no soldering of any kind. Just tune the BFO on USB and on LSB a bit far away from the 455KHz ceramic filter (using the transformer for LSB and the capacitor for USB, as the manual states). As the video shows, this provides the near to
carrier selectivity to cut off the unwanted sideband.
The price you pay is more high frequencies (but in the wanted sideband) and a bit attenuated low frequencies as the filter is effectively shifted to higher frequencies. Very high frequencies cut-off is helped by the tone control of the receiver to some point.
This is a cost-free mod and requiring even no soldering skills, neither any mod to the receiver. Now as you tune the bands in SSB and CW, you do not hear the same signal twice. On AM mode nothing changes, since the BFO is switched off in this mode.
Many thanks for sharing this, Kostas! This seems like a simple adjustment for one of my all-time favorite receivers!
Many thanks to SWLing Post contributor (and certified mad scientist), Emilio Ruiz, who writes:
Recently I was given a broken Grundig G8 Traveler II. This radio had an accident–the case, speaker, tuning knob, and volume controls were all broken or damaged.
I discovered that the tuning and volume controls are not potentiometers, they are a rotary encoders, so I substituted the tiny and broken original controls with rotary encoders (typically used for Arduino projects), but I needed to remove the 10 kiloohms resistor to work properly (only used the CLK, DT, and GND pins).
All materials were reused from other things, the result is like a “Frankenstein radio”.
The “telescopic” antenna is a tape measure/flexometer which was broken too. I replaced the original speaker (which I think was another impedance) with a proper 8 ohms speaker which produced low volume, so i decide add a Pam8403 amplifier module for best performance. The total current drain is 0.10 amp for a regular “loud” audio level.
This is brilliant, Emilio! Although this radio is quite scary–and, let’s face it, “post-apocalyptic”–I think it’s absolutely amazing! I love the handle and the tape measure antenna. You, sir, are a mad scientist and I look forward to your next creation! (I’ll just take shelter first!) 🙂
Many thanks to SWLing Post contributor, Dan Robinson, who shares the following:
Antonio Fernandez, who is in Spain, posted this on the Extreme page. Very interesting R-2000 mods:
Major modifications are adjustable RF GAIN (using the former TONE control), BFO Pitch control (former AM Squelch, FM Squelch is retained) and DSP Audio filtering for SSB and CW. Internal DSP module is SOTABEAMS Laserbeam Filter Module. The former DIMMER and NB push switches are used for switching on (bypassing) the DSP module and bandwidth (CW, SSB) selection.
Many thanks to SWLing Post contributor, Jesse (W9JES) who writes:
I’ve been busy enhancing my Radio Shack DX-390. I added an IF-Out jack for my SDR, changed out the light for a LED, added a latch circuit for the light switch, added static protection, and disabled auto-mute. My blog with full instructions is at www.w9jes.com
Thank you, Jesse! Here are links to the various modifications Jesse has documented:
Many thanks to SWLing Post contributor, Jiri Kaplan, who writes:
Is it possible to modify the new (DSP) DEGEN DE1103 for VLF reception?
Like before, the old Degen version (without DSP), see these videos:
I wonder if instead of the DE1103 I should buy the PL-660 or PL-680?
I think DSP is worse and the old version can no longer unfortunately be purchased.
My main concern is good selectivity and sensitivity, I live in the city, there are many strong signals.
Thank you for your question, Jiri.
I’m certain you can’t use the same modification of the original DE1103 on the DSP version to achieve VLF reception. In fact, unless the DSP chip itself can be hacked, I imagine modding the DSP DE1103 for VLF would be quite difficult.
I hope more knowledgeable SWLing Post readers can comment with a definitive answer.
Regarding the choice between the DE1103 DSP and the PL–660 or PL-680? I wouldn’t hesitate to grab either Tecsun receiver over the DE1103 DSP. Check out my short review of the DE1103 DSP for more info about this particular model’s shortcomings.
You’re right about finding the original DE1103. I did create this eBay link that should help filter out the DSP models from the search results. At time of posting, there were no listings.