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  #21 (permalink)  
Old 06-03-2012, 4:57 PM
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Hi Hertzian been using a BHI NES10-2 MK3 DSP Noise Eliminating Speaker on my Alinco DX-R8 what a difference it makes sounds like my Icom-R75 with the dsp board have also tried the speaker on other radios including my other Icom-R75 with no dsp board very happy with the results..

Regards Lino..
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  #22 (permalink)  
Old 06-04-2012, 4:12 AM
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I'll have to look at the BHI unit. I used to run a Timewave DSP-599zx, but it pulls more than 3 times the current that the Alinco alone does.

The R75 dsp is useful - normally I just tickle the top end with it, and the auto notch works ok if someone is right on top of you. Handy to have for sure, but the lack of noise filtering in the Alinco isn't a showstopper.

I've got a collins mechanical 2.4khz sitting around from another project, so I might solder that in and see how it goes....

Interestingly enough, I found that the internal speaker on the Alinco sounds better than the R75's speaker for ssb/cw. Problem is, mine will vibrate the case, or go resonant on some low frequencies, so I keep it kind of low - still very usable for what it is at low volume levels. Then again, I'm not really going to discount either receiver's fidelity with 1-2 inch speakers.

Last edited by hertzian; 06-04-2012 at 4:16 AM..
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  #23 (permalink)  
Old 06-05-2012, 4:53 AM
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Default Filter flexibility

Took the board out of the Alinco (20 screws or so later...) and was about to solder in the spare collins mechanical for ssb. Running late so will have to do it another day. However I saw good soldering, and the solder-bridge tabs were right next to the spare filter holes for mechanical filters which should make the job very easy.

Like the 718, this all has to be soldered in, and not just easily socketed like the R75.

Did some more investigation, and saw that both the Alinco and the Icom 718 use the Murata CFJ455K-5 filter for ssb. An affordable upgrade would be to replace it with the CJF455K-12 (or V12) series if you can find them. (steeper skirts than the -5.) This upgrade to the -12 series was done on early Kenwood 830's, 930's, and 940's.

The R75 also uses the CFJ455K-5 for ssb, but is also preceded by a 9mhz IF crystal filter. No wonder it has better selectivity in stock form.

OH, and you can use the narrow 2.4khz ssb filter on the Alinco for narrow am filtering - you just have to tune off frequency by 1 - 1.5 khz, and accept a little less signal strength and fidelity, but it is an option if you don't want to do ECSSB on am.

If you don't mind soldering, the Alinco has plenty of room to accomodate 3 upgraded filters should you want to do so. So both the Icom R75 and Alinco DX-R8 are very flexible in this regard - it's just a lot easier and more effective on the R75.

Owning and using both of them, it really comes down to the R75 being in another price/performance bracket entirely, and the Alinco being nearest to the capabilities of the Icom 718. One wonders if Icom couldn't do the same as Alinco, and strip the transmit guts out of the 718, maybe put in a CFJ455K-12 (instead of the -5) and offer an economy receiver model.

That being said, 95% of what I do on the Icom R75 can be done on the Alinco DX-R8 - it just takes a bit more button pushing and knob twirling.

Last edited by hertzian; 06-05-2012 at 5:10 AM.. Reason: typos
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  #24 (permalink)  
Old 06-25-2012, 5:13 PM
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Default New Filters installed

I swapped out the stock Murata ceramic filters for Collins mechanical types. The 500hz cw filter was a perfect fit into the pre-drilled holes, whereas the slightly larger 2.3khz mechanical required some coax jumpers. To the left is AM filter, which I left alone.

The filters are very easy to access, so you could customize it to your needs from various filter vendors. Just be sure you have the proper desoldering tools. Do NOT try this with a 30watt iron and some solder wick - the filter cans and wick will drag away all the heat making the job a nightmare. Use good tools for removal.

I'm not trying to make this into a contest receiver, and most probably won't need them. I was quite happy with the stock setup, but wanted just a wee bit smoother response for those long monitoring sessions behind headphones. Of course right out of the gate, the 500hz cw filter made a big difference in selectivity, although in non-contest situations, the cw audio filter did fine.
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Last edited by hertzian; 06-25-2012 at 5:17 PM..
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  #25 (permalink)  
Old 06-27-2012, 11:07 PM
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Thank you for the update.
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  #26 (permalink)  
Old 09-10-2013, 12:31 AM
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Smile Alinco Replacement filters

Hertzian ,

Thanks for the info on the filters in the DX-R8....I removed and replaced the SSB CFK455J-5 (2.4) with the CFK455J-12 (2.9)....I left the AM filter W55G (9kHz) alone as there are not to many AM stations that close together anymore and the 9kHz gives good fidelity. However I do have a Kiwa blue dot AM filter (6.8)
just incase I might need at a later date....I also left the stock CW filter alone as the (1 kHz) is not bad.

You are right about NOT using a 30 watt iron and solder wick, I had to have help desoldering as the holes where the pins of the filter go into the circuit board are VERY TIGHT...It was a job removing the old filter! I would recommend having someone else do the filter swap unless you have quality soldering tools and are very experienced at soldering circuit boards. Just my opinion.....

Anyway I am happy with the results, wasn't a big change but just enough to make it a little bit better on AM narrow and SSB. I love the Alinco dx-r8 , for me it's a keeper and a nice little receiver for SWL..
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  #27 (permalink)  
Old 10-12-2013, 2:48 AM
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Nice update and pic - I don't know how I missed it.

One thing I seem to forget is when I switch from ssb to cw, and have the IF shift moved even just the tiniest bit off center, I'll wonder why cw sounds a bit strange. Moving the if shift around, even just the tiniest bit really helps on cw copy, especially if you have the 1khz crystal filter followed by the 500hz cw audio filter.
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  #28 (permalink)  
Old 10-12-2013, 9:06 PM
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Thanks Hertzian for the positive comment.

I don't listen to cw very much...However I must say that the IF Shift is very effective and makes the DX-R8 an excellent receiver. I do use it frequently on AM nar,SSB and SSB nar with superb results.

I have posted a review,for what it is worth, on the Alinco DX-R8T on "eham.net".

Also I recently purchased a Palstar SP30B communications external speaker (4"speaker/5w) I found that it reproduces a Full sound accenting the lower mid-range. This to my ears is very pleasant and less fatiguing to listen to. I highly recommend.
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  #29 (permalink)  
Old 10-13-2013, 3:21 AM
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Thanks for the tip on the Palstar speaker! I will look into that one - with an upper end of only 8K, this seems to be a real comms speaker that allows for pleasant music reproduction, though obviously not full spectrum - being somewhat narrow I like for shortwave uses. I'll check it out for sure. I'm currently using a Yaesu SP-8 which does nicely, but I'm always on the lookout.

I am familiar with the fatigue - I am very sensitive to audio amplifier high-end hiss, and an 8K cutoff makes that much more tolerable - even when the rig might have a high and lowpass audio adjustment - at low levels I can sometimes *still* hear it sneaking through in the background. Fortunately, the Alinco is pretty clean, so I can listen for long times, but I'll think about the Palstar.

Last edited by hertzian; 10-13-2013 at 3:27 AM..
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  #30 (permalink)  
Old 10-26-2013, 12:55 PM
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"Alinco hinted that an updated version of the tabletop DX-R8T is on the way, the DX-R9(T). It will have the same form factor of the DX-R8T, but the receiver will be built around Collins mechanical filters, which will be much easier to replace than the current ones in the DX-R8T. Ill post an announcement when the DX-R9 is in production."

The 2013 Dayton Hamvention | The SWLing Post

Looks like a DX R9 may be in the works, based off the T

DX-SR9T Detail information
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  #31 (permalink)  
Old 10-26-2013, 3:27 PM
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Fingers crossed that the new units allow for user-adjustable KNOB dial resolution beyond the fixed sloooow rate. I'm wearing out my up/down buttons even for just casual band operations. Not a showstopper, but frustrating at times leading me back to other rigs with selectable vfo dial rates.

Last edited by hertzian; 10-26-2013 at 3:32 PM..
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Old 10-26-2013, 3:42 PM
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With the SDR Software KG-TRX, I think you can operate most functions with the software, looks cool

送受信SDRソフトウエア KG-TRX
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  #33 (permalink)  
Old 10-27-2013, 4:51 AM
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Looks fun.

Unfortunately, I don't like being tied to a single operating system. Maybe if that ran under Wine for Gnu/Linux, or have a native port for mac even, I might be interested. For now, it's fluff. But that's just me.

It is apparent that the designer really favors CW, as the inclusion of a 1k ceramic followed by a 500hz audio filter, along with extremely slow vfo knob tuning suits that type of operation. Which is nice, but the assumption that ssb is better suited primarily to memories or other channelized operations (perhaps to suit export versions of these inexpensive hf radios to that market) is also apparent. A simple switch to simply double the current vfo tuning rate would be most welcome for those of us that like to use the VFO primarily.

But thanks for the updated information! It is always interesting.

Last edited by hertzian; 10-27-2013 at 4:53 AM..
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