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Re: Maldol mini-dipole and portable 10' mast
Stephen M. King
From: "Richard B Drake" <rich@...>
To: <FT817@...> Sent: Tuesday, May 15, 2001 5:25 PM Subject: [FT817] RE: Maldol mini-dipole and portable 10' mast However, one difference in my plan is instead of using the PVC pipe as a mastVERY interesting idea! Please let us know how it works out .... 73, Stephen W3SMK |
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Re: ZM-2 tuner
Glyph
I have a ZM-2 -- my only complaint about it is that it wasn't designed for
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rugged use -- such as my application on bicycle tours (a lot of vibration and small shocks). The large and small toroids are not secured in place. I gooped in a bunch of silicone to do the job. Hope the silicone doesn't impair the function of the thing. -- Bil KD6JUI ----- Original Message -----
From: Don <k7ugq@...> To: <FT817@...> Sent: Tuesday, May 15, 2001 3:53 AM Subject: [FT817] ZM-2 tuner Enjoy these shots of NA1X's handy work on building this real neat and veryfunctional antenna tuner. After playing with them, it takes only 2 to 3 seconds to match the ft-817 to the antenna. the food court nearest to the Yaesu booth. 439.125 simplex. To unsubscribe from this group, send an email to:Questions ) see
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Re: MP-1 vs ATX
--- In FT817@y..., Brickle@p... wrote:
don wrote:instead...a BIG difference in making the lower mast about 3' long ofof the 10" stock length...I had a chance to fool around with an MP-1 a little bit yesterday #12 wire each 19" long at the top of the whip.before dark) to make an appreciable difference in tuning (both sharpnessand low SWR), particularly when the hat was rotated to be parallel withto tune on 10m with the longer mast. 38" of hat is probably too much.that it *will* handle higher power (50w easy) if you've got it. Andlately some extra power has become indispensable...love my 817 but it ain'tFrank - Get a 3/8" x 24 thread "long" nut, like used on mobile mounts, and screw the 9" and 24" sections together - That makes things even better. An a hat made with more (4) but shorter wires will give the same perfomance with less interaction. I also find the telescoping whip much easier to work with. Don |
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Re: MP-1 vs ATX
don wrote:
...a BIG difference in making the lower mast about 3' long insteadI had a chance to fool around with an MP-1 a little bit yesterday evening, using the tripod, both the short and the 2' "mobile" mast, the sectional (ie not telescoping) whip, and the stock counterpoise bundle. I also eventually added a capacitance hat made of 2 pieces of #12 wire each 19" long at the top of the whip. The longer mast and the hat appeared (in the few minutes I had before dark) to make an appreciable difference in tuning (both sharpness and low SWR), particularly when the hat was rotated to be parallel with some of the counterpoise wires. However the hat made it impossible to tune on 10m with the longer mast. 38" of hat is probably too much. BTW one big advantage of the MP-1 over the ATX, by me anyway, is that it *will* handle higher power (50w easy) if you've got it. And lately some extra power has become indispensable...love my 817 but it ain't cutting it with the short antennas at the moment. Frank AB2KT |
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PSK31 and HL50 mods (long)
Mike Agner
There were several messages a while back about how to create
your own cables for running the 817 in PSK31 mode. But for those that want something different, here are the 4 or so manufacturers that handle soundcard interfaces I know about from the famous goodies list. There may be more of these, of course, and if I have left someone out, please let me know: -------------------- A. Rigblaster and Nomic West Mountain Radio 18 Sheehan Avenue Norwalk, CT 06854 Phone 203.853.8080 Fax 203.299.0232 URL: B. Tigertronics Signalink Sound Card Interface P.O. Box 5210 Grants Pass, Oregon 97527 Phone: 1-800-8BAYPAC (822-9722) FAX: (541)474-6703 URL: C. PSK31 Isoterm Mr J Melvin 2 Salters Court, Gosforth, Newcastle upon Tyne. NE3 5BH. ENGLAND. Phone: 0191 2843028 Email: psk31@... URL: D. Windows SSTV VOX controller (useful for other modes, too) Peter Lockwood G8SLB, 36 Davington Road, Dagenham, Essex, RM8 2LR Email: G8SLB@... URL: E. The 'Rascal' and the 'Rascal Isolated' interfaces BUX CommCo 115 Luenburg Drive Evington, VA 24550 FAX: (804) 525-7818 URL: -------------------------------------- Now about the HL50 mods: These messages came in a while back and has very good information on what to do. Note that I have left the ids intact so someone can email these folks for more information: --------------------------------- Date: Tue, 10 Apr 2001 07:57:20 -0400 From: "John O. Newell" <jnewell@...> Subject: HL-50B Mod During an HF-Pack QSO on Saturday, Norman K2YEW mentioned that Tokyo Hy-Power would supply details on a mod to the HL-50B amp that will allow full drive from 5w. (My LDG DWM shows about 45w out from 5w drive using the 0-150w HF sensor.) Bob KC3VO also mentioned a mod and offered to talk it through on the telephone, but I've never followed up because I hesitate to disturb the peace with the ring of the telephone -- not sure whether this is the same mod. Anyway, I emailed THP and with their usual blindingly fast and friendly service, THP sent me the following information. Replace existing components with new components (#s from schematic supplied with amp): R8 3.3 kOhm 0.25-0.50 Watt R10 620 Ohm 2 Watt R11 56 Ohm 2 Watt R14 620 Ohm 1 Watt Haven't tried it yet and all the usual disclaimers apply. Date: Tue, 10 Apr 2001 12:13:07 From: "V G" <pmb1010@...> Subject: Re: HL-50B Mod I retrofitted my HL50B with the mentioned parts, works perfect. 50w minimum now, and 60 on a couple of bands (40 and 30, I think). Be careful when you remove the board from the case. The ribbon cable to front faceplate is very fragile. I removed only the back cover and flipped the board over with the ribbon cable, which was a mistake. Take off both covers. I had to refab my ribbon cable when i broke a couple of the delicate wires... By the way, there are 2 schematics floating around. The one I got with my rig was wrong. THP will gladly fax the correct one you you for the asking. Those guys REALLY know the meaning of "customer service"! Vic K2YW Date: Tue, 10 Apr 2001 12:58:57 EDT From: K2YEW@... Subject: Re: [HFpack] HL-50B Mod Dear John, FB on you purchasing the four resistors needed for the modification in order to drive the HL-50B HF brick amplifier to its maximum output with only the 5 Watt output of the Yaesu FT-817 transceiver. After installing this mod, here are the results, being careful to establish a perfectly flat 50 Ohm load on the amplifier, 13.8 volts on the amplifier/FT-817, and measuring the power on the power scale of my MFJ 969 tuner: 1/2W drive ---------------------------- 6W output [1 green light lit] 1W drive ------------------------------- 20W output [2 green lights lit] 2-1/2W drive ------------------------- 45W output [4 green lights lit] 5W drive ------------------------------ 65W output [5 green lights lit] 73s Mike |
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Re: Which Performs Better: ATX or MP-1?
Nick Marsh
julian@... wrote:
For an experiment in what you could do in the temporary indoorJulian and others, I travel a lot and have found motel rooms to be RF noisy. Most U.S. hotels have fixed windows that don't open so a dipole draped along the walls looked like the best deal one could get, until you turn the radio on. Some of the noise is TV and cable related, the rest, who knows? Wishing for the all band, indoor glass mount, HF antenna for my 817. 73 Nick WB4SQI |
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Resume delay when scanning with the FT817
David Harvey
I have programmed some of my local public service channels into the
FT817 so I can listen while I am tapping at the computer. However, the resume function happens immediately and ignores whatever setting (0,3,5,10) that I have entered. Is there a fault in the 817, or is it some operator error? Thanks. es 72 de VK2DMH DAVID |
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Re: MP-1 vs ATX
David Perry
Me too!
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David ----- Original Message -----
From: <don@...> To: <FT817@...> Sent: Tuesday, May 15, 2001 9:52 PM Subject: [FT817] Re: MP-1 vs ATX the food court nearest to the Yaesu booth. 439.125 simplex.Some final speculation. Although the MP-1 ought theoretically tooutperformthe ATX by virtue of its bigger loading coil, you will only get thebenefitof that if you have a very good ground system to go with it. In ourit is To unsubscribe from this group, send an email to:Questions ) see
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Re: Looking under the hood of the '817...
Ray Goff
Clint,
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Nice work, I look forward to the remaining sections... 72's Ray - g4fon -----Original Message-----
From: cctbcn@... [mailto:cctbcn@...] Sent: 15 May 2001 22:17 To: FT817@... Subject: [FT817] Looking under the hood of the '817... I've been doing a bit of looking under the hood of the FT-817 (having owned one for a couple months now) and have been slowly putting together some web pages describing what I have found. The pages may be found at: These pages detail things like receiver performance (image response versus frequency, sensitivity, a few details as to why things work the way they do...) as well as things about the transmitter, FT-817 power consumption, as well as how to optimize power consumption when operating the '817 from batteries. I have also done a bit of looking into the CAT command set and am currently documenting a number of commands not outline that allow much more complete access to the inner workings of the '817 (including a few things that could get you into *really big* trouble if you don't take care.) Also under construction are a few "app note" type of pages that detail using the '817 in signal strength measurements as well as using it with Lithium-Ion batteries. These pages are still under construction (some more than others) and more are likely to be added. It is very likely that there will be plenty of errors and typos that haven't been caught. If you see obvious errors and/or omissions, please let me know about it (and what the correct information should be.) 73, Clint ***____FLASH_____** FT-817 users GET TOGETHER at Dayton Hamvention Saturday at 3PM. Meet at the food court nearest to the Yaesu booth. 439.125 simplex. To unsubscribe from this group, send an email to: FT817-unsubscribe@... and for a great FAQ ( Frequently Asked Questions ) see Your use of Yahoo! Groups is subject to |
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Re: New Product
Don
You say on the Daimond page... what is the url your refering to? I can't
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thread this post. Thanks ----- Original Message -----
From: <KG4CHX@...> To: <FT817@...> Sent: Tuesday, May 15, 2001 8:46 AM Subject: [FT817] Re: New Product On the Daimond page you will see a multiband dipole, has fiberglassthe food court nearest to the Yaesu booth. 439.125 simplex. To unsubscribe from this group, send an email to:Questions ) see
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Re: Maldol mini-dipole and portable 10' mast
Peter,
I find your post very interesting. I just ordered an 817 yesterday and without even trying it yet, or seeing your post until just now, I ordered a pair of 20 meter Maldol whips having in mind to do almost exactly what you describe, right down to using the Radio Shack mini box and connectors to make the center junction. If it works out OK I'll get pairs of loading coils for the other bands. I guess I have enough experience with whips and verticals to know that this thing is not going to work very well without a good counterpoise so let's dispense with that idea right off the bat. The dipole configuration solves that problem. However, one difference in my plan is instead of using the PVC pipe as a mast at the center of a horizontal dipole, I would slide one of the whips into the PVC pipe for support and configure it as a center fed "vertical" dipole. I should be able to mount that as a temporary antenna on my boat simply by standing it up in a fishing rod holder. I wonder if anyone has tried anything like that? I'll look forward to any pointers you may be able to provide and I will certainly share my own experiences with the group. ---- 73, Rich - W3ZJ From: "Peter A. Brandenberg" <peter@b...> Date: Fri May 11, 2001 11:30 pm Subject: Maldol mini-dipole and portable 10' mast. I was tired of trying to match a counterpoise to my Maldols, so I made a small dipole out of a set of two for each band. It works like a charm! I used a Radio Shack plastic box about 1.5" x 3" and put a coax connector at the end, and on either side a male jack for each of the Maldol whips. Then I bought a 10' length of 3/4" PVC and cut it into 24" pieces with connecting sleeves at the end of each piece. Then I can easily carry the whole shebang, 817, paddle, mike, battery, dipoles, and 10' mast in a small carrying case for easy setup. I also have the auto-tuner that helps get the SWR to 1:1. I found that the 20 meter Maldol is resonant at 13.8 and to get it up to 14.05 or higher I have to compress the whips several inches, losing radiation area. I'd be happy to share details should anyone want them. Also can someone tell me how I can get the 817 up to 5 watts if I use a 12 volt battery???? Apparently if the radio doesn't see 13 volts it runs only 2.5 watts. That is dumb! Thanks, 73, Peter K2MMT ----- 73, Rich - W3ZJ www.w3zj.com |
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Looking under the hood of the '817...
I've been doing a bit of looking under the hood of the FT-817 (having
owned one for a couple months now) and have been slowly putting together some web pages describing what I have found. The pages may be found at: These pages detail things like receiver performance (image response versus frequency, sensitivity, a few details as to why things work the way they do...) as well as things about the transmitter, FT-817 power consumption, as well as how to optimize power consumption when operating the '817 from batteries. I have also done a bit of looking into the CAT command set and am currently documenting a number of commands not outline that allow much more complete access to the inner workings of the '817 (including a few things that could get you into *really big* trouble if you don't take care.) Also under construction are a few "app note" type of pages that detail using the '817 in signal strength measurements as well as using it with Lithium-Ion batteries. These pages are still under construction (some more than others) and more are likely to be added. It is very likely that there will be plenty of errors and typos that haven't been caught. If you see obvious errors and/or omissions, please let me know about it (and what the correct information should be.) 73, Clint |
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Re: MP-1 vs ATX
Some final speculation. Although the MP-1 ought theoretically tooutperform the ATX by virtue of its bigger loading coil, you will only get thebenefit of that if you have a very good ground system to go with it. In ourit is the ground resistance or the counterpoise, not the coil resistancethat is determining performance. Therefore the ATX will probably work aswell as any antenna of similar size used in that situation.Julian - I did some computer modeling of the MP1 a while back, and found a BIG difference in making the lower mast about 3' long instead of the 10" stock length - like over 6 db on 7 mhz and decreasing to about 3 db on 28 mHz (in fact, the performance should be sililar to what you nboted on the Pro-am, as they would then be about the same physical size). I have not found the MP1 to be as fussy about the ground plane as the ATX, and the it certianly is more efficent, even with the short lower section, on 10, 18 & 24 mHz. I use 4 radials 18' long of 18 guage wire. I've tried different counterpoise solutions, but the best seems to be a "roll-up" counterpoise made from a Radio Shack short wave antenna - no problem getting it to work on the MP1, but the ATX is EXTREEMLY fussy - actually, the only way I can get the SWR anything close to low on 14 mHz is by adjusting the length and then bring the end back to near the rig..... putting it out in a straight line doesn't work at all unless the whip on the ATX is made about 6" longer with a clip lead - similar problem on 21 mHz. On 7 mHz, it is not fussy about the groundplane and presents a reasonalble match across the whole band - so does a dummy load!!! The MP-1 has a definite bandwidth that is MUCH narrower, which means the coil is higher Q, and therefore should be more efficent. Yes - a dipole would be better - just as long as you have a place to put it up. But also not as easy to change bands. And I shudder at the thought of adding gear to the package in the form of an ATU. I am very happy with the MP1 and the clamp mount or tripod - lets me get the antenna outside in the clear, tunes easily, performs well. I'll trade you my ATX for your MP-1 anyday Don W6ZO |
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Re: NEW FT817 ACCESSORIES + MORE AT Dayton NEWS
Works for me now, too. Never mind.
--- In FT817@y..., "Michael Minor" <nh6cj@h...> wrote: I just left the site (18:15 UTC)and it worked fine...NEWSFrom: "F.B. Nutter, Jr." <fbnjr@m...> 114 andDate: Tue, 15 May 2001 13:38:10 -0400 batterycheck them out. Otherwise, check out their website: W4RT theycover and the capacity/charging problem in one shot. I hope announcement ofhavea bunch of them at Dayton. The MaHa battery alone is $39. worthYaesu rebates during Dayton which all dealers will offer Radio$20to $50 depending on the Yaesu product. Meetor[www.debticated.com]the w4rt guys. PS:Does anyone know if they are related to RT Askedat the food court nearest to the Yaesu booth. 439.125 simplex. Service.Questions ) see _________________________________________________________________ |
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Re: HL-50B amp
Newell, John O
just arrived in the mail today the thp hl-50b ampMike, there are quite a few posts on the HL-50B, including the ALC connx and tx pwr mod, in the FT817 group archive. There are also quite a few posts (many not duplicates of posts here) in the archive for the HFPack group, also on Yahoo...if you do a search for "HL-50B" in the subject line you will come up with most of them. GL es 73 John Newell KB1FPM ------------------------------------------------------------------------ This message is intended only for the designated recipient(s). It may contain confidential or proprietary information and may be subject to the attorney-client privilege or other confidentiality protections. If you are not a designated recipient, you may not review, copy or distribute this message. If you receive this in error, please notify the sender by reply e-mail and delete this message. Thank you. |
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Re: Which Performs Better: ATX or MP-1?
Demetre Valaris - SV1UY
Hi guys,
I agree with Julian in most of what he says. We must not forget that the ATX and MP-1 are convenience antennas and it all depends on which way one uses his/her portable radio. I personally did not buy the FT- 817 to operate from home where I can have a decent aerial, such as a dipole. I bought it to operate while I walk and when I am on holidays and that means that I have to use a small aerial. The ATX is the smallest multiband I have seen so far and I am quite happy with it even if it has limitations. When I walk I cannot carry a 3 element YAGI. Sometimes I wish I could though!!! The MP-1 should be better than the ATX because of its bigger coil and also because one can use a longer base section up to 1 meter or so. The ATX has only got a 30cm wander lead which is like a base section on the bands of 40m and above, but of course its coil is made from think wire and the Q is rather low. I wish I had the time to stay outside on the field and test both antennas with the same counterpoise. Who knows, maybe some time this summer I might do it, or maybe when I am on holiday. My father in law has a big enough private garden for this experiment, so I might go there! Will keep the list posted. I do not think that experiments inside ones house are good. Any kind of antenna inside a house will be a poor performer. 73 de Demetre SV1UY |
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Re: Which Performs Better: ATX or MP-1?
David Perry
Good points well made, but the comment "as well as any antenna that size"
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says it all. As I said, I'll keep trying. So far the ATX has HA and SP. David ----- Original Message -----
From: <julian@...> To: <FT817@...> Sent: Tuesday, May 15, 2001 7:40 PM Subject: [FT817] Re: Which Performs Better: ATX or MP-1? Well I am impressed with how well it works for its size. I don'tthe food court nearest to the Yaesu booth. 439.125 simplex. To unsubscribe from this group, send an email to:Questions ) see
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