Thank you for your reply.I will try to conductive support and reliable reflector conduction, observe whether it will warm.
"How-to - the Construct a helix" document where I can find it?I will carefully study him
Thank you for your reply.I will try to conductive support and reliable reflector conduction, observe whether it will warm.
"How-to - the Construct a helix" document where I can find it?I will carefully study him
So how do you explain the heating of the carbon fiber tube support during launch? The diameter of the carbon tube is 12mm, and my emission power is 20w or more. The carbon tube is in the center of the spiral coil. Heating is evident near the reflector feed. In addition, the carbon tube may not have communicated with the reflector
The antenna is not perpendicular to the tomato wire due to the improper replacement of the supporting material. I will fix it next week. If you use conductive material inside the helix, does it really affect the emission?
At first, I used the carbon fiber tube as the support, and it began to get hot during high-power launch. After replacing the fiberglass tube, I found that the carbonized part of the plate during laser cutting during launch had a flame. It didn't work until I cleaned out all the internal conductive parts
If used for receiving, I don't find any effect of conductive material inside the antenna. From the return loss, there is almost no difference. Right
DIY's third Helix antenna was tested tonight and can work in SSB mode.And make QSO with PA1EW and PA3FYM.PA3FYM gives the signal report of s58.Receive using websdr, websdr currently has many delays and pauses.Also used IS0GRB websdr page, almost the same effect...Can anyone give more options for websdr?
30 N. Length 92 cm
@P3AFYM This article answers some questions... thank you
I according to the http://jcoppens.com/ant/helix/calc.en.php design of 26 N spiral antenna, the design gain for 23 db.Actual test can be generated in the cw mode than low noise and high signal-to-noise ratio of about 19 db.Now can work in digital communication mode.I think far not up to gain design.Who can give me a confirmation of parameters and drawings.thank you
You need to release some pictures...
With the CW first beacon after roughly on the satellite.Use broadband video beacon carefully adjust the Angle and the polarization and LNB.This is my way...So that we can achieve the best alignment effect
Interesting work.How does this work?I want to give it a try
Interesting idea...
Ha ha.Please pay attention to the second picture.I have changed the ring device of 2350-2450.
Last night I adjusted the feed of standing wave ratio, the uplink signal increases.Now I can pass the repeater receives the signals of their own.But if you want to increase the rate of codes work, I need to carry the 1.2 m antenna to the roof.
@SWL - markro92 A new feature request.When using sirspy do receiving.Whether can make Bias-Tee, I need to use it output Bias voltage polarization voltage switching time control LNB.So you can switch on the computer to 18 v power supply.
I don't know if it will be easy to implement, thank you. Thank you.
Display MoreI'm using this dish with Patch antenna from G3RUH and am very happy with..
James has some in stock still..
73 Guntram oe9dgv.
This is a standard Chinese wok...