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Yaesu VX-8DR

2015/08/12 By staze

Yaesu_VX-8DRAs I mentioned in my Ham post, I mentioned that I purchased a Yaesu VX-8DR. This is still one of the top of the line HTs that Yaesu makes (it’s THE top of the line for their analog HTs, from what I can tell). It’s only been surpassed by the new digital line, from what I can tell, though I don’t believe either of their digital line HTs are IPX-7 certified (water resistance, etc). I basically wanted a radio that my son could get ahold of, and drop, or dunk, and not break.

So, first off, the radio is small. It’s basically as small as you could make it and still have it “fill” a “normal” hand. I have relatively normal size hands, and if it was any smaller, it would be pretty unusable. The buttons are pretty small, as people have commented on online, but the radio would get bigger if they were any bigger. There’s a lot of inputs here. If anything, the PTT button may be a bit small, but that actually prevents hitting it overly accidentally.

When I first got the radio, I didn’t have my callsign yet, so I was pretty paranoid about keying it up, but thankfully I got the callsign the next day. So that was nice.

The unit is a bit confusing to use. There is a ton of functionality there. It receives from 500khz to 999Mhz, it transmits on 4 bands (6m, 2m, 1.25M, and 70cm) ((More if you mod it)), has dual listen (can listen on two completely separate channels at once), and has AM/FM broadcast listening. So you can, in fact, listen to a local repeater, and an AM/FM broadcast as well. I found myself last night listening to a local, very active (because it was tied into the WIN system for “Insomniac”) repeater and a local FM radio station, or listening to the very local, yet dead repeater, and talking (when I could) on the more active WIN system repeater.

One tweak I would suggest Yaesu make if they continue with this design of radio… make the “volume” button configurable. The way it is with the VX-8DR is the main nob changes frequency, or channel (depending on if you’re in VFO or Memory mode), and you have to hold the Volume button to use the knob to change volume. I would like to reverse that, so volume is changed by default, and frequency is changed when holding that button.

Otherwise, the unit is great. It sounds great, feels great, and performs quite well with the standard rubber duck (I’ve just ordered a SMA to BNC adapter from Stephen Gulyas, and then a little stubby dual band antenna (Maldol MH-209) (should be good for events, or other close quarters talking, camping/hiking, or even chatting on local repeater), and a bigger whip style antenna (Diamond RH77CA). Sure, neither will do 6M, or 1.25M, but I haven’t really used them at all on this unit… maybe when I want to branch out I’ll pick up antennas for those purposes (6M on an HT generally means a big antenna, and poor results (you need more than 5W power), and 220Mhz requires something that I can’t seem to find easily (Smiley 27000?)).

All and all, I love the unit. I’m still searching for a good “pouch” for it that I can put on my bag, and unsure when I’ll buy the speaker/mic (it’s expensive). But, should be fun, and hopefully not lead to too many more purchases (at some point I’ll probably want something that’ll do true HF, but that’ll also require a license upgrade (at least General) for me for most of the HF bands).

[xrr rating=5/5]

Filed Under: Reviews Tagged With: Diamond, Maldol, VX-8DR, Yaesu

TSI DP-Calc 8705

2015/08/06 By staze

8705-DPCalcI recently had a complaint from someone staying at my house that the guest room stayed too warm when the door was closed. Knowing there was no air return vent in that room, I figured the door being closed was preventing good air flow. But, sadly, there was no good way to test this (with the tools I had). So, I went hunting on eBay for the proper tools, and found the TSI DP-Calc 8705 (a Micro-manometer) with no bids, for $15! Sure, it was listed as broken, but they admitted they just didn’t have the means/knowledge to test it. And the sticker had shown it was calibrated in 2012. So, I bought it. Even if it was broken, it would probably be a decent source of parts, or a good teardown to send to the EEVblog. =)

Unit arrived a couple weeks later, and was in amazing condition. Sure, it didn’t come with the RS-232 cable, or tubing, or static/pilot tubes, but I didn’t really need any of that for my purpose. It seems to register perfect, and I was able to go around my house and measure the pressure differentials with the door closed (sticking the more positive “sensor” tube under the door from the main part of the house into the room with the HVAC running). With that, I got the following results:

Bedroom 5.72 pascals (high)
Son’s room: 9.2 pascals (very high)
Bathroom: .747 pascals (great!)
Office: 3.48 pascals (high)

The US Department of Energy Energy Star homes standards for closed door pressure differentials at ≤3 pascals (0.01″wc) (undercutting doors), but using those numbers, it does seem like the gap under all my doors (except possibly the bathroom) is too small. I say possibly with the bathroom because excess pressure would just push out the bathroom fan exhaust. So my next quest will be to cut the door openings a bit larger and see how that changes things.

I also made a nice serial interface cable for the unit using an old DB-9 cable, and some RJ-45 ends. To figure out the pinout, I emailed TSI, and they sent me the whole schematic for the unit! The pinout is “backward” from right to left looking at an RJ-45 connector, but making the cable was pretty painless, and seems to work. The unit literally sends the measurement to the computer when you hit “Print” (just plain old ASCII). If you type “V” on the computer, it’ll echo back the current reading. Pretty simple, and could make for some fun experiments.

Overall, while the unit is pretty old relative to more modern units, it still does an amazing job, and is more than capable of doing what I need. Also, for reference, the tubing is 3/16″ ID and 5/16″ OD. I purchased some Tygon tubing from work and use that. I may buy some silicone tubing in the future…

[xrr rating=5/5]

Filed Under: Reviews Tagged With: flow, HVAC, Micro-manometer, pressure, RS232, velocity

HAM for the man that doesn’t eat Pork

2015/08/06 By staze

International_amateur_radio_symbolAnyone who reads my blog, at all, knows I’ve been repairing a lot of gear for the last while. But, I’ve wanted to take it up another notch, and repair some radio equipment… mainly HF/VHF/UHF transceivers. Now, while there’s nothing against doing that and being unlicensed for Amateur Radio, I thought it would be more responsible to actually have a license so I could test said gear rather than just pumping it into a dummy load.

So, I spent a couple weeks studying, and took the Amateur License Exam 2 weeks ago, and passed Technician with no problem at all. Sadly, I was able to take the General exam right after for free, and missed it by one question! So, I have my license, and right now, have a call sign of KG7VJC, which is fine, but I have applied for a Vanity Call Sign. That takes a while, so I’m holding off on saying what that call sign may end up being.

As for a radio, I initially planned on just buying a Baofeng radio, but after never hearing anything overly great about them (other than cheap), I started watching eBay and Craigslist for used Yaesu/Icom/Kenwood HTs (Handheld Transmitters). I quickly found one, in Portland, for a Yaesu VX-8DR, a pretty high end HT that looked awesome. So, I saved up a bit, and just last week bought it while up in PDX for a bit more than I’d have liked, but I’m sure it will serve me well, and radios really seem to hold their value (I can always resell if I need to).

Anyway, I’m now a ham. I’ll post a review of the radio (and probably other radio gear as acquired), as well as be adding some repairs of transceivers once I have some to repair. I’ll also be joining a local club… as that was suggested by the person I bought the radio from (lamenting he hadn’t joined one earlier). Joining the ARRL, though, may not happen anytime soon. It’s kind of spendy.

Filed Under: Miscellany Tagged With: HA, HAM, KG7VJC

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